[help]belajar proxy squid

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mus_theleader
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Joined: 12 Dec 2011, 18:25
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[help]belajar proxy squid

Postby mus_theleader » 24 Jul 2012, 07:19

tolongin ane gan yang lagi belajar jaringan. ane lagi nyoba nih pasang squid di ubuntu 12.04, tapi abis sekian lama ane utak - atik scriptnya kayak gini,

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# WELCOME TO SQUID 3.1.19 # ---------------------------- # # This is the documentation for the Squid configuration file. # This documentation can also be found online at: # http://www.squid-cache.org/Doc/config/ # # You may wish to look at the Squid home page and wiki for the # FAQ and other documentation: # http://www.squid-cache.org/ # http://wiki.squid-cache.org/SquidFaq # http://wiki.squid-cache.org/ConfigExamples # # This documentation shows what the defaults for various directives # happen to be. If you don't need to change the default, you should # leave the line out of your squid.conf in most cases. # # In some cases "none" refers to no default setting at all, # while in other cases it refers to the value of the option # - the comments for that keyword indicate if this is the case. # # Configuration options can be included using the "include" directive. # Include takes a list of files to include. Quoting and wildcards are # supported. # # For example, # # include /path/to/included/file/squid.acl.config # # Includes can be nested up to a hard-coded depth of 16 levels. # This arbitrary restriction is to prevent recursive include references # from causing Squid entering an infinite loop whilst trying to load # configuration files. # TAG: dns_testnames # Remove this line. DNS is no longer tested on startup. #Default: # none # TAG: extension_methods # Remove this line. All valid methods for HTTP are accepted by default. #Default: # none # TAG: incoming_rate #Default: # none # TAG: server_http11 # Remove this line. HTTP/1.1 is supported by default. #Default: # none # TAG: upgrade_http0.9 # Remove this line. ICY/1.0 streaming protocol is supported by default. #Default: # none # TAG: zph_local # Alter these entries. Use the qos_flows directive instead. #Default: # none # TAG: header_access # Since squid-3.0 replace with request_header_access or reply_header_access # depending on whether you wish to match client requests or server replies. #Default: # none # TAG: httpd_accel_no_pmtu_disc # Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead. #Default: # none # OPTIONS FOR AUTHENTICATION # ----------------------------------------------------------------------------- # TAG: auth_param # This is used to define parameters for the various authentication # schemes supported by Squid. # # format: auth_param scheme parameter [setting] # # The order in which authentication schemes are presented to the client is # dependent on the order the scheme first appears in config file. IE # has a bug (it's not RFC 2617 compliant) in that it will use the basic # scheme if basic is the first entry presented, even if more secure # schemes are presented. For now use the order in the recommended # settings section below. If other browsers have difficulties (don't # recognize the schemes offered even if you are using basic) either # put basic first, or disable the other schemes (by commenting out their # program entry). # # Once an authentication scheme is fully configured, it can only be # shutdown by shutting squid down and restarting. Changes can be made on # the fly and activated with a reconfigure. I.E. You can change to a # different helper, but not unconfigure the helper completely. # # Please note that while this directive defines how Squid processes # authentication it does not automatically activate authentication. # To use authentication you must in addition make use of ACLs based # on login name in http_access (proxy_auth, proxy_auth_regex or # external with %LOGIN used in the format tag). The browser will be # challenged for authentication on the first such acl encountered # in http_access processing and will also be re-challenged for new # login credentials if the request is being denied by a proxy_auth # type acl. # # WARNING: authentication can't be used in a transparently intercepting # proxy as the client then thinks it is talking to an origin server and # not the proxy. This is a limitation of bending the TCP/IP protocol to # transparently intercepting port 80, not a limitation in Squid. # Ports flagged 'transparent', 'intercept', or 'tproxy' have # authentication disabled. # # === Parameters for the basic scheme follow. === # # "program" cmdline # Specify the command for the external authenticator. Such a program # reads a line containing "username password" and replies "OK" or # "ERR" in an endless loop. "ERR" responses may optionally be followed # by a error description available as %m in the returned error page. # If you use an authenticator, make sure you have 1 acl of type # proxy_auth. # # By default, the basic authentication scheme is not used unless a # program is specified. # # If you want to use the traditional NCSA proxy authentication, set # this line to something like # # auth_param basic program /usr/lib/squid3/ncsa_auth /usr/etc/passwd # # "utf8" on|off # HTTP uses iso-latin-1 as characterset, while some authentication # backends such as LDAP expects UTF-8. If this is set to on Squid will # translate the HTTP iso-latin-1 charset to UTF-8 before sending the # username & password to the helper. # # "children" numberofchildren # The number of authenticator processes to spawn. If you start too few # Squid will have to wait for them to process a backlog of credential # verifications, slowing it down. When password verifications are # done via a (slow) network you are likely to need lots of # authenticator processes. # auth_param basic children 5 # # "concurrency" concurrency # The number of concurrent requests the helper can process. # The default of 0 is used for helpers who only supports # one request at a time. Setting this changes the protocol used to # include a channel number first on the request/response line, allowing # multiple requests to be sent to the same helper in parallell without # wating for the response. # Must not be set unless it's known the helper supports this. # auth_param basic concurrency 0 # # "realm" realmstring # Specifies the realm name which is to be reported to the # client for the basic proxy authentication scheme (part of # the text the user will see when prompted their username and # password). There is no default. # auth_param basic realm Squid proxy-caching web server # # "credentialsttl" timetolive # Specifies how long squid assumes an externally validated # username:password pair is valid for - in other words how # often the helper program is called for that user. Set this # low to force revalidation with short lived passwords. Note # setting this high does not impact your susceptibility # to replay attacks unless you are using an one-time password # system (such as SecureID). If you are using such a system, # you will be vulnerable to replay attacks unless you also # use the max_user_ip ACL in an http_access rule. # # "casesensitive" on|off # Specifies if usernames are case sensitive. Most user databases are # case insensitive allowing the same username to be spelled using both # lower and upper case letters, but some are case sensitive. This # makes a big difference for user_max_ip ACL processing and similar. # auth_param basic casesensitive off # # === Parameters for the digest scheme follow === # # "program" cmdline # Specify the command for the external authenticator. Such # a program reads a line containing "username":"realm" and # replies with the appropriate H(A1) value hex encoded or # ERR if the user (or his H(A1) hash) does not exists. # See rfc 2616 for the definition of H(A1). # "ERR" responses may optionally be followed by a error description # available as %m in the returned error page. # # By default, the digest authentication scheme is not used unless a # program is specified. # # If you want to use a digest authenticator, set this line to # something like # # auth_param digest program /usr/lib/squid3/digest_pw_auth /usr/etc/digpass # # "utf8" on|off # HTTP uses iso-latin-1 as characterset, while some authentication # backends such as LDAP expects UTF-8. If this is set to on Squid will # translate the HTTP iso-latin-1 charset to UTF-8 before sending the # username & password to the helper. # # "children" numberofchildren # The number of authenticator processes to spawn (no default). # If you start too few Squid will have to wait for them to # process a backlog of H(A1) calculations, slowing it down. # When the H(A1) calculations are done via a (slow) network # you are likely to need lots of authenticator processes. # auth_param digest children 5 # # "realm" realmstring # Specifies the realm name which is to be reported to the # client for the digest proxy authentication scheme (part of # the text the user will see when prompted their username and # password). There is no default. # auth_param digest realm Squid proxy-caching web server # # "nonce_garbage_interval" timeinterval # Specifies the interval that nonces that have been issued # to client_agent's are checked for validity. # # "nonce_max_duration" timeinterval # Specifies the maximum length of time a given nonce will be # valid for. # # "nonce_max_count" number # Specifies the maximum number of times a given nonce can be # used. # # "nonce_strictness" on|off # Determines if squid requires strict increment-by-1 behavior # for nonce counts, or just incrementing (off - for use when # useragents generate nonce counts that occasionally miss 1 # (ie, 1,2,4,6)). Default off. # # "check_nonce_count" on|off # This directive if set to off can disable the nonce count check # completely to work around buggy digest qop implementations in # certain mainstream browser versions. Default on to check the # nonce count to protect from authentication replay attacks. # # "post_workaround" on|off # This is a workaround to certain buggy browsers who sends # an incorrect request digest in POST requests when reusing # the same nonce as acquired earlier on a GET request. # # === NTLM scheme options follow === # # "program" cmdline # Specify the command for the external NTLM authenticator. # Such a program reads exchanged NTLMSSP packets with # the browser via Squid until authentication is completed. # If you use an NTLM authenticator, make sure you have 1 acl # of type proxy_auth. By default, the NTLM authenticator_program # is not used. # # auth_param ntlm program /usr/lib/squid3/ntlm_auth # # "children" numberofchildren # The number of authenticator processes to spawn (no default). # If you start too few Squid will have to wait for them to # process a backlog of credential verifications, slowing it # down. When credential verifications are done via a (slow) # network you are likely to need lots of authenticator # processes. # # auth_param ntlm children 5 # # "keep_alive" on|off # Whether to keep the connection open after the initial response where # Squid tells the browser which schemes are supported by the proxy. # Some browsers are known to present many login popups or to corrupt # POST/PUT requests transfer if the connection is not closed. # The default is currently OFF to avoid this, but may change. # # auth_param ntlm keep_alive on # # === Options for configuring the NEGOTIATE auth-scheme follow === # # "program" cmdline # Specify the command for the external Negotiate authenticator. # This protocol is used in Microsoft Active-Directory enabled setups with # the Microsoft Internet Explorer or Mozilla Firefox browsers. # Its main purpose is to exchange credentials with the Squid proxy # using the Kerberos mechanisms. # If you use a Negotiate authenticator, make sure you have at least # one acl of type proxy_auth active. By default, the negotiate # authenticator_program is not used. # The only supported program for this role is the ntlm_auth # program distributed as part of Samba, version 4 or later. # # auth_param negotiate program /usr/lib/squid3/ntlm_auth --helper-protocol=gss-spnego # # "children" numberofchildren # The number of authenticator processes to spawn (no default). # If you start too few Squid will have to wait for them to # process a backlog of credential verifications, slowing it # down. When crendential verifications are done via a (slow) # network you are likely to need lots of authenticator # processes. # auth_param negotiate children 5 # # "keep_alive" on|off # Whether to keep the connection open after the initial response where # Squid tells the browser which schemes are supported by the proxy. # Some browsers are known to present many login popups or to corrupt # POST/PUT requests transfer if the connection is not closed. # The default is currently OFF to avoid this, but may change. # # auth_param negotiate keep_alive on # # # Examples: # ##Recommended minimum configuration per scheme: ##auth_param negotiate program ##auth_param negotiate children 5 ##auth_param negotiate keep_alive on ## ##auth_param ntlm program ##auth_param ntlm children 5 ##auth_param ntlm keep_alive on ## ##auth_param digest program ##auth_param digest children 5 ##auth_param digest realm Squid proxy-caching web server ##auth_param digest nonce_garbage_interval 5 minutes ##auth_param digest nonce_max_duration 30 minutes ##auth_param digest nonce_max_count 50 ## ##auth_param basic program ##auth_param basic children 5 ##auth_param basic realm Squid proxy-caching web server ##auth_param basic credentialsttl 2 hours #Default: # none # TAG: authenticate_cache_garbage_interval # The time period between garbage collection across the username cache. # This is a tradeoff between memory utilization (long intervals - say # 2 days) and CPU (short intervals - say 1 minute). Only change if you # have good reason to. #Default: # authenticate_cache_garbage_interval 1 hour # TAG: authenticate_ttl # The time a user & their credentials stay in the logged in # user cache since their last request. When the garbage # interval passes, all user credentials that have passed their # TTL are removed from memory. #Default: # authenticate_ttl 1 hour # TAG: authenticate_ip_ttl # If you use proxy authentication and the 'max_user_ip' ACL, # this directive controls how long Squid remembers the IP # addresses associated with each user. Use a small value # (e.g., 60 seconds) if your users might change addresses # quickly, as is the case with dialups. You might be safe # using a larger value (e.g., 2 hours) in a corporate LAN # environment with relatively static address assignments. #Default: # authenticate_ip_ttl 0 seconds # ACCESS CONTROLS # ----------------------------------------------------------------------------- # TAG: external_acl_type # This option defines external acl classes using a helper program # to look up the status # # external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..] # # Options: # # ttl=n TTL in seconds for cached results (defaults to 3600 # for 1 hour) # negative_ttl=n # TTL for cached negative lookups (default same # as ttl) # children=n Number of acl helper processes spawn to service # external acl lookups of this type. (default 5) # concurrency=n concurrency level per process. Only used with helpers # capable of processing more than one query at a time. # cache=n result cache size, 0 is unbounded (default) # grace=n Percentage remaining of TTL where a refresh of a # cached entry should be initiated without needing to # wait for a new reply. (default 0 for no grace period) # protocol=2.5 Compatibility mode for Squid-2.5 external acl helpers # ipv4 / ipv6 IP-mode used to communicate to this helper. # For compatability with older configurations and helpers # the default is currently 'ipv4'. # # FORMAT specifications # # %LOGIN Authenticated user login name # %EXT_USER Username from external acl # %IDENT Ident user name # %SRC Client IP # %SRCPORT Client source port # %URI Requested URI # %DST Requested host # %PROTO Requested protocol # %PORT Requested port # %PATH Requested URL path # %METHOD Request method # %MYADDR Squid interface address # %MYPORT Squid http_port number # %PATH Requested URL-path (including query-string if any) # %USER_CERT SSL User certificate in PEM format # %USER_CERTCHAIN SSL User certificate chain in PEM format # %USER_CERT_xx SSL User certificate subject attribute xx # %USER_CA_xx SSL User certificate issuer attribute xx # # %>{Header} HTTP request header "Header" # %>{Hdr:member} # HTTP request header "Hdr" list member "member" # %>{Hdr:;member} # HTTP request header list member using ; as # list separator. ; can be any non-alphanumeric # character. # # % TCP connections established. [fast] # # NOTE: This only measures direct TCP links so X-Forwarded-For # # indirect clients are not counted. # # acl aclname max_user_ip [-s] number # # This will be matched when the user attempts to log in from more # # than different ip addresses. The authenticate_ip_ttl # # parameter controls the timeout on the ip entries. [fast] # # If -s is specified the limit is strict, denying browsing # # from any further IP addresses until the ttl has expired. Without # # -s Squid will just annoy the user by "randomly" denying requests. # # (the counter is reset each time the limit is reached and a # # request is denied) # # NOTE: in acceleration mode or where there is mesh of child proxies, # # clients may appear to come from multiple addresses if they are # # going through proxy farms, so a limit of 1 may cause user problems. # # acl aclname req_mime_type [-i] mime-type ... # # regex match against the mime type of the request generated # # by the client. Can be used to detect file upload or some # # types HTTP tunneling requests [fast] # # NOTE: This does NOT match the reply. You cannot use this # # to match the returned file type. # # acl aclname req_header header-name [-i] any\.regex\.here # # regex match against any of the known request headers. May be # # thought of as a superset of "browser", "referer" and "mime-type" # # ACL [fast] # # acl aclname rep_mime_type [-i] mime-type ... # # regex match against the mime type of the reply received by # # squid. Can be used to detect file download or some # # types HTTP tunneling requests. [fast] # # NOTE: This has no effect in http_access rules. It only has # # effect in rules that affect the reply data stream such as # # http_reply_access. # # acl aclname rep_header header-name [-i] any\.regex\.here # # regex match against any of the known reply headers. May be # # thought of as a superset of "browser", "referer" and "mime-type" # # ACLs [fast] # # acl aclname external class_name [arguments...] # # external ACL lookup via a helper class defined by the # # external_acl_type directive [slow] # # acl aclname user_cert attribute values... # # match against attributes in a user SSL certificate # # attribute is one of DN/C/O/CN/L/ST [fast] # # acl aclname ca_cert attribute values... # # match against attributes a users issuing CA SSL certificate # # attribute is one of DN/C/O/CN/L/ST [fast] # # acl aclname ext_user username ... # acl aclname ext_user_regex [-i] pattern ... # # string match on username returned by external acl helper [slow] # # use REQUIRED to accept any non-null user name. # # acl aclname tag tagvalue ... # # string match on tag returned by external acl helper [slow] # # Examples: # acl macaddress arp 09:00:2b:23:45:67 # acl myexample dst_as 1241 # acl password proxy_auth REQUIRED # acl fileupload req_mime_type -i ^multipart/form-data$ # acl javascript rep_mime_type -i ^application/x-javascript$ # #Default: # acl all src all # # # Recommended minimum configuration: # acl manager proto cache_object acl localhost src 127.0.0.1/32 ::1 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed #acl localnet src 10.0.0.0/8 # RFC1918 possible internal network #acl localnet src 172.16.0.0/12 # RFC1918 possible internal network #acl localnet src 192.168.0.0/16 # RFC1918 possible internal network #acl localnet src fc00::/7 # RFC 4193 local private network range #acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT # TAG: follow_x_forwarded_for # Allowing or Denying the X-Forwarded-For header to be followed to # find the original source of a request. # # Requests may pass through a chain of several other proxies # before reaching us. The X-Forwarded-For header will contain a # comma-separated list of the IP addresses in the chain, with the # rightmost address being the most recent. # # If a request reaches us from a source that is allowed by this # configuration item, then we consult the X-Forwarded-For header # to see where that host received the request from. If the # X-Forwarded-For header contains multiple addresses, we continue # backtracking until we reach an address for which we are not allowed # to follow the X-Forwarded-For header, or until we reach the first # address in the list. For the purpose of ACL used in the # follow_x_forwarded_for directive the src ACL type always matches # the address we are testing and srcdomain matches its rDNS. # # The end result of this process is an IP address that we will # refer to as the indirect client address. This address may # be treated as the client address for access control, ICAP, delay # pools and logging, depending on the acl_uses_indirect_client, # icap_uses_indirect_client, delay_pool_uses_indirect_client and # log_uses_indirect_client options. # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # # SECURITY CONSIDERATIONS: # # Any host for which we follow the X-Forwarded-For header # can place incorrect information in the header, and Squid # will use the incorrect information as if it were the # source address of the request. This may enable remote # hosts to bypass any access control restrictions that are # based on the client's source addresses. # # For example: # # acl localhost src 127.0.0.1 # acl my_other_proxy srcdomain .proxy.example.com # follow_x_forwarded_for allow localhost # follow_x_forwarded_for allow my_other_proxy #Default: # follow_x_forwarded_for deny all # TAG: acl_uses_indirect_client on|off # Controls whether the indirect client address # (see follow_x_forwarded_for) is used instead of the # direct client address in acl matching. # # NOTE: maxconn ACL considers direct TCP links and indirect # clients will always have zero. So no match. #Default: # acl_uses_indirect_client on # TAG: delay_pool_uses_indirect_client on|off # Controls whether the indirect client address # (see follow_x_forwarded_for) is used instead of the # direct client address in delay pools. #Default: # delay_pool_uses_indirect_client on # TAG: log_uses_indirect_client on|off # Controls whether the indirect client address # (see follow_x_forwarded_for) is used instead of the # direct client address in the access log. #Default: # log_uses_indirect_client on # TAG: http_access # Allowing or Denying access based on defined access lists # # Access to the HTTP port: # http_access allow|deny [!]aclname ... # # NOTE on default values: # # If there are no "access" lines present, the default is to deny # the request. # # If none of the "access" lines cause a match, the default is the # opposite of the last line in the list. If the last line was # deny, the default is allow. Conversely, if the last line # is allow, the default will be deny. For these reasons, it is a # good idea to have an "deny all" entry at the end of your access # lists to avoid potential confusion. # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # #Default: [b]# http_access deny all[/b] # # # Recommended minimum Access Permission configuration: # # Only allow cachemgr access from localhost http_access allow manager localhost http_access deny manager # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # We strongly recommend the following be uncommented to protect innocent # web applications running on the proxy server who think the only # one who can access services on "localhost" is a local user #http_access deny to_localhost # # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # # Example rule allowing access from your local networks. # Adapt localnet in the ACL section to list your (internal) IP networks # from where browsing should be allowed #http_access allow localnet http_access allow localhost # And finally deny all other access to this proxy #http_access deny all # TAG: adapted_http_access # Allowing or Denying access based on defined access lists # # Essentially identical to http_access, but runs after redirectors # and ICAP/eCAP adaptation. Allowing access control based on their # output. # # If not set then only http_access is used. #Default: # none # TAG: http_reply_access # Allow replies to client requests. This is complementary to http_access. # # http_reply_access allow|deny [!] aclname ... # # NOTE: if there are no access lines present, the default is to allow # all replies # # If none of the access lines cause a match the opposite of the # last line will apply. Thus it is good practice to end the rules # with an "allow all" or "deny all" entry. # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none # TAG: icp_access # Allowing or Denying access to the ICP port based on defined # access lists # # icp_access allow|deny [!]aclname ... # # See http_access for details # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # ## Allow ICP queries from local networks only ##icp_access allow localnet ##icp_access deny all #Default: # icp_access deny all # TAG: htcp_access # Allowing or Denying access to the HTCP port based on defined # access lists # # htcp_access allow|deny [!]aclname ... # # See http_access for details # # NOTE: The default if no htcp_access lines are present is to # deny all traffic. This default may cause problems with peers # using the htcp or htcp-oldsquid options. # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # ## Allow HTCP queries from local networks only ##htcp_access allow localnet ##htcp_access deny all #Default: # htcp_access deny all # TAG: htcp_clr_access # Allowing or Denying access to purge content using HTCP based # on defined access lists # # htcp_clr_access allow|deny [!]aclname ... # # See http_access for details # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # ## Allow HTCP CLR requests from trusted peers #acl htcp_clr_peer src 172.16.1.2 #htcp_clr_access allow htcp_clr_peer #Default: # htcp_clr_access deny all # TAG: miss_access # Determins whether network access is permitted when satisfying a request. # # For example; # to force your neighbors to use you as a sibling instead of # a parent. # # acl localclients src 172.16.0.0/16 # miss_access allow localclients # miss_access deny !localclients # # This means only your local clients are allowed to fetch relayed/MISS # replies from the network and all other clients can only fetch cached # objects (HITs). # # # The default for this setting allows all clients who passed the # http_access rules to relay via this proxy. # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # miss_access allow all # TAG: ident_lookup_access # A list of ACL elements which, if matched, cause an ident # (RFC 931) lookup to be performed for this request. For # example, you might choose to always perform ident lookups # for your main multi-user Unix boxes, but not for your Macs # and PCs. By default, ident lookups are not performed for # any requests. # # To enable ident lookups for specific client addresses, you # can follow this example: # # acl ident_aware_hosts src 198.168.1.0/24 # ident_lookup_access allow ident_aware_hosts # ident_lookup_access deny all # # Only src type ACL checks are fully supported. A srcdomain # ACL might work at times, but it will not always provide # the correct result. # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # ident_lookup_access deny all # TAG: reply_body_max_size size [acl acl...] # This option specifies the maximum size of a reply body. It can be # used to prevent users from downloading very large files, such as # MP3's and movies. When the reply headers are received, the # reply_body_max_size lines are processed, and the first line where # all (if any) listed ACLs are true is used as the maximum body size # for this reply. # # This size is checked twice. First when we get the reply headers, # we check the content-length value. If the content length value exists # and is larger than the allowed size, the request is denied and the # user receives an error message that says "the request or reply # is too large." If there is no content-length, and the reply # size exceeds this limit, the client's connection is just closed # and they will receive a partial reply. # # WARNING: downstream caches probably can not detect a partial reply # if there is no content-length header, so they will cache # partial responses and give them out as hits. You should NOT # use this option if you have downstream caches. # # WARNING: A maximum size smaller than the size of squid's error messages # will cause an infinite loop and crash squid. Ensure that the smallest # non-zero value you use is greater that the maximum header size plus # the size of your largest error page. # # If you set this parameter none (the default), there will be # no limit imposed. # # Configuration Format is: # reply_body_max_size SIZE UNITS [acl ...] # ie. # reply_body_max_size 10 MB # #Default: # none # NETWORK OPTIONS # ----------------------------------------------------------------------------- # TAG: http_port # Usage: port [options] # hostname:port [options] # 1.2.3.4:port [options] # # The socket addresses where Squid will listen for HTTP client # requests. You may specify multiple socket addresses. # There are three forms: port alone, hostname with port, and # IP address with port. If you specify a hostname or IP # address, Squid binds the socket to that specific # address. This replaces the old 'tcp_incoming_address' # option. Most likely, you do not need to bind to a specific # address, so you can use the port number alone. # # If you are running Squid in accelerator mode, you # probably want to listen on port 80 also, or instead. # # The -a command line option may be used to specify additional # port(s) where Squid listens for proxy request. Such ports will # be plain proxy ports with no options. # # You may specify multiple socket addresses on multiple lines. # # Options: # # intercept Support for IP-Layer interception of # outgoing requests without browser settings. # NP: disables authentication and IPv6 on the port. # # tproxy Support Linux TPROXY for spoofing outgoing # connections using the client IP address. # NP: disables authentication and maybe IPv6 on the port. # # accel Accelerator mode. Also needs at least one of # vhost / vport / defaultsite. # # allow-direct Allow direct forwarding in accelerator mode. Normally # accelerated requests are denied direct forwarding as if # never_direct was used. # # defaultsite=domainname # What to use for the Host: header if it is not present # in a request. Determines what site (not origin server) # accelerators should consider the default. # Implies accel. # # vhost Accelerator mode using Host header for virtual domain support. # Also uses the port as specified in Host: header unless # overridden by the vport option. Implies accel. # # vport Virtual host port support. Using the http_port number # instead of the port passed on Host: headers. Implies accel. # # vport=NN Virtual host port support. Using the specified port # number instead of the port passed on Host: headers. # Implies accel. # # protocol= Protocol to reconstruct accelerated requests with. # Defaults to http. # # ignore-cc Ignore request Cache-Control headers. # # Warning: This option violates HTTP specifications if # used in non-accelerator setups. # # connection-auth[=on|off] # use connection-auth=off to tell Squid to prevent # forwarding Microsoft connection oriented authentication # (NTLM, Negotiate and Kerberos) # # disable-pmtu-discovery= # Control Path-MTU discovery usage: # off lets OS decide on what to do (default). # transparent disable PMTU discovery when transparent # support is enabled. # always disable always PMTU discovery. # # In many setups of transparently intercepting proxies # Path-MTU discovery can not work on traffic towards the # clients. This is the case when the intercepting device # does not fully track connections and fails to forward # ICMP must fragment messages to the cache server. If you # have such setup and experience that certain clients # sporadically hang or never complete requests set # disable-pmtu-discovery option to 'transparent'. # # ssl-bump Intercept each CONNECT request matching ssl_bump ACL, # establish secure connection with the client and with # the server, decrypt HTTP messages as they pass through # Squid, and treat them as unencrypted HTTP messages, # becoming the man-in-the-middle. # # When this option is enabled, additional options become # available to specify SSL-related properties of the # client-side connection: cert, key, version, cipher, # options, clientca, cafile, capath, crlfile, dhparams, # sslflags, and sslcontext. See the https_port directive # for more information on these options. # # The ssl_bump option is required to fully enable # the SslBump feature. # # name= Specifies a internal name for the port. Defaults to # the port specification (port or addr:port) # # tcpkeepalive[=idle,interval,timeout] # Enable TCP keepalive probes of idle connections. # In seconds; idle is the initial time before TCP starts # probing the connection, interval how often to probe, and # timeout the time before giving up. # # If you run Squid on a dual-homed machine with an internal # and an external interface we recommend you to specify the # internal address:port in http_port. This way Squid will only be # visible on the internal address. # # # Squid normally listens to port 3128 [b]http_port 3128[/b] # TAG: https_port # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Usage: [ip:]port cert=certificate.pem [key=key.pem] [options...] # # The socket address where Squid will listen for HTTPS client # requests. # # This is really only useful for situations where you are running # squid in accelerator mode and you want to do the SSL work at the # accelerator level. # # You may specify multiple socket addresses on multiple lines, # each with their own SSL certificate and/or options. # # Options: # # accel Accelerator mode. Also needs at least one of # defaultsite or vhost. # # defaultsite= The name of the https site presented on # this port. Implies accel. # # vhost Accelerator mode using Host header for virtual # domain support. Requires a wildcard certificate # or other certificate valid for more than one domain. # Implies accel. # # protocol= Protocol to reconstruct accelerated requests with. # Defaults to https. # # cert= Path to SSL certificate (PEM format). # # key= Path to SSL private key file (PEM format) # if not specified, the certificate file is # assumed to be a combined certificate and # key file. # # version= The version of SSL/TLS supported # 1 automatic (default) # 2 SSLv2 only # 3 SSLv3 only # 4 TLSv1 only # # cipher= Colon separated list of supported ciphers. # NOTE: some ciphers such as EDH ciphers depend on # additional settings. If those settings are # omitted the ciphers may be silently ignored # by the OpenSSL library. # # options= Various SSL engine options. The most important # being: # NO_SSLv2 Disallow the use of SSLv2 # NO_SSLv3 Disallow the use of SSLv3 # NO_TLSv1 Disallow the use of TLSv1 # SINGLE_DH_USE Always create a new key when using # temporary/ephemeral DH key exchanges # See OpenSSL SSL_CTX_set_options documentation for a # complete list of options. # # clientca= File containing the list of CAs to use when # requesting a client certificate. # # cafile= File containing additional CA certificates to # use when verifying client certificates. If unset # clientca will be used. # # capath= Directory containing additional CA certificates # and CRL lists to use when verifying client certificates. # # crlfile= File of additional CRL lists to use when verifying # the client certificate, in addition to CRLs stored in # the capath. Implies VERIFY_CRL flag below. # # dhparams= File containing DH parameters for temporary/ephemeral # DH key exchanges. See OpenSSL documentation for details # on how to create this file. # WARNING: EDH ciphers will be silently disabled if this # option is not set. # # sslflags= Various flags modifying the use of SSL: # DELAYED_AUTH # Don't request client certificates # immediately, but wait until acl processing # requires a certificate (not yet implemented). # NO_DEFAULT_CA # Don't use the default CA lists built in # to OpenSSL. # NO_SESSION_REUSE # Don't allow for session reuse. Each connection # will result in a new SSL session. # VERIFY_CRL # Verify CRL lists when accepting client # certificates. # VERIFY_CRL_ALL # Verify CRL lists for all certificates in the # client certificate chain. # # sslcontext= SSL session ID context identifier. # # generate-host-certificates[=] # Dynamically create SSL server certificates for the # destination hosts of bumped CONNECT requests.When # enabled, the cert and key options are used to sign # generated certificates. Otherwise generated # certificate will be selfsigned. # If there is CA certificate life time of generated # certificate equals lifetime of CA certificate. If # generated certificate is selfsigned lifetime is three # years. # This option is enabled by default when SslBump is used. # See the sslBump option above for more information. # # dynamic_cert_mem_cache_size=SIZE # Approximate total RAM size spent on cached generated # certificates. If set to zero, caching is disabled. The # default value is 4MB. An average XXX-bit certificate # consumes about XXX bytes of RAM. # # vport Accelerator with IP based virtual host support. # # vport=NN As above, but uses specified port number rather # than the https_port number. Implies accel. # # name= Specifies a internal name for the port. Defaults to # the port specification (port or addr:port) # #Default: # none # TAG: tcp_outgoing_tos # Allows you to select a TOS/Diffserv value to mark outgoing # connections with, based on the username or source address # making the request. # # tcp_outgoing_tos ds-field [!]aclname ... # # Example where normal_service_net uses the TOS value 0x00 # and good_service_net uses 0x20 # # acl normal_service_net src 10.0.0.0/24 # acl good_service_net src 10.0.1.0/24 # tcp_outgoing_tos 0x00 normal_service_net # tcp_outgoing_tos 0x20 good_service_net # # TOS/DSCP values really only have local significance - so you should # know what you're specifying. For more information, see RFC2474, # RFC2475, and RFC3260. # # The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or # "default" to use whatever default your host has. Note that in # practice often only multiples of 4 is usable as the two rightmost bits # have been redefined for use by ECN (RFC 3168 section 23.1). # # Processing proceeds in the order specified, and stops at first fully # matching line. # # Note: The use of this directive using client dependent ACLs is # incompatible with the use of server side persistent connections. To # ensure correct results it is best to set server_persisten_connections # to off when using this directive in such configurations. #Default: # none # TAG: clientside_tos # Allows you to select a TOS/Diffserv value to mark client-side # connections with, based on the username or source address # making the request. #Default: # none # TAG: qos_flows # Allows you to select a TOS/DSCP value to mark outgoing # connections with, based on where the reply was sourced. # # TOS values really only have local significance - so you should # know what you're specifying. For more information, see RFC2474, # RFC2475, and RFC3260. # # The TOS/DSCP byte must be exactly that - octet value 0x00-0xFF. # Note that in practice often only values up to 0x3F are usable # as the two highest bits have been redefined for use by ECN # (RFC3168). # # This setting is configured by setting the source TOS values: # # local-hit=0xFF Value to mark local cache hits. # # sibling-hit=0xFF Value to mark hits from sibling peers. # # parent-hit=0xFF Value to mark hits from parent peers. # # # NOTE: 'miss' preserve feature is only possible on Linux at this time. # # For the following to work correctly, you will need to patch your # linux kernel with the TOS preserving ZPH patch. # The kernel patch can be downloaded from http://zph.bratcheda.org # # disable-preserve-miss # By default, the existing TOS value of the response coming # from the remote server will be retained and masked with # miss-mark. This option disables that feature. # # miss-mask=0xFF # Allows you to mask certain bits in the TOS received from the # remote server, before copying the value to the TOS sent # towards clients. # Default: 0xFF (TOS from server is not changed). # #Default: # none # TAG: tcp_outgoing_address # Allows you to map requests to different outgoing IP addresses # based on the username or source address of the user making # the request. # # tcp_outgoing_address ipaddr [[!]aclname] ... # # Example where requests from 10.0.0.0/24 will be forwarded # with source address 10.1.0.1, 10.0.2.0/24 forwarded with # source address 10.1.0.2 and the rest will be forwarded with # source address 10.1.0.3. # # acl normal_service_net src 10.0.0.0/24 # acl good_service_net src 10.0.2.0/24 # tcp_outgoing_address 10.1.0.1 normal_service_net # tcp_outgoing_address 10.1.0.2 good_service_net # tcp_outgoing_address 10.1.0.3 # # Processing proceeds in the order specified, and stops at first fully # matching line. # # Note: The use of this directive using client dependent ACLs is # incompatible with the use of server side persistent connections. To # ensure correct results it is best to set server_persistent_connections # to off when using this directive in such configurations. # # # IPv6 Magic: # # Squid is built with a capability of bridging the IPv4 and IPv6 # internets. # tcp_outgoing_address as exampled above breaks this bridging by forcing # all outbound traffic through a certain IPv4 which may be on the wrong # side of the IPv4/IPv6 boundary. # # To operate with tcp_outgoing_address and keep the bridging benefits # an additional ACL needs to be used which ensures the IPv6-bound traffic # is never forced or permitted out the IPv4 interface. # # # IPv6 destination test along with a dummy access control to perofrm the required DNS # # This MUST be place before any ALLOW rules. # acl to_ipv6 dst ipv6 # http_access deny ipv6 !all # # tcp_outgoing_address 2001:db8::c001 good_service_net to_ipv6 # tcp_outgoing_address 10.1.0.2 good_service_net !to_ipv6 # # tcp_outgoing_address 2001:db8::beef normal_service_net to_ipv6 # tcp_outgoing_address 10.1.0.1 normal_service_net !to_ipv6 # # tcp_outgoing_address 2001:db8::1 to_ipv6 # tcp_outgoing_address 10.1.0.3 !to_ipv6 # # WARNING: # 'dst ipv6' bases its selection assuming DIRECT access. # If peers are used the peername ACL are needed to select outgoing # address which can link to the peer. # # 'dst ipv6' is a slow ACL. It will only work here if 'dst' is used # previously in the http_access rules to locate the destination IP. # Some more magic may be needed for that: # http_access allow to_ipv6 !all # (meaning, allow if to IPv6 but not from anywhere ;) # #Default: # none # SSL OPTIONS # ----------------------------------------------------------------------------- # TAG: ssl_unclean_shutdown # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Some browsers (especially MSIE) bugs out on SSL shutdown # messages. #Default: # ssl_unclean_shutdown off # TAG: ssl_engine # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # The OpenSSL engine to use. You will need to set this if you # would like to use hardware SSL acceleration for example. #Default: # none # TAG: sslproxy_client_certificate # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Client SSL Certificate to use when proxying https:// URLs #Default: # none # TAG: sslproxy_client_key # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Client SSL Key to use when proxying https:// URLs #Default: # none # TAG: sslproxy_version # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # SSL version level to use when proxying https:// URLs #Default: # sslproxy_version 1 # TAG: sslproxy_options # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # SSL engine options to use when proxying https:// URLs # # The most important being: # # NO_SSLv2 Disallow the use of SSLv2 # NO_SSLv3 Disallow the use of SSLv3 # NO_TLSv1 Disallow the use of TLSv1 # SINGLE_DH_USE # Always create a new key when using # temporary/ephemeral DH key exchanges # # These options vary depending on your SSL engine. # See the OpenSSL SSL_CTX_set_options documentation for a # complete list of possible options. #Default: # none # TAG: sslproxy_cipher # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # SSL cipher list to use when proxying https:// URLs # # Colon separated list of supported ciphers. #Default: # none # TAG: sslproxy_cafile # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # file containing CA certificates to use when verifying server # certificates while proxying https:// URLs #Default: # none # TAG: sslproxy_capath # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # directory containing CA certificates to use when verifying # server certificates while proxying https:// URLs #Default: # none # TAG: ssl_bump # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # This ACL controls which CONNECT requests to an http_port # marked with an sslBump flag are actually "bumped". Please # see the sslBump flag of an http_port option for more details # about decoding proxied SSL connections. # # By default, no requests are bumped. # # See also: http_port ssl-bump # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # # # # Example: Bump all requests except those originating from localhost and # # those going to webax.com or example.com sites. # # acl localhost src 127.0.0.1/32 # acl broken_sites dstdomain .webax.com # acl broken_sites dstdomain .example.com # ssl_bump deny localhost # ssl_bump deny broken_sites # ssl_bump allow all #Default: # none # TAG: sslproxy_flags # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Various flags modifying the use of SSL while proxying https:// URLs: # DONT_VERIFY_PEER Accept certificates that fail verification. # For refined control, see sslproxy_cert_error. # NO_DEFAULT_CA Don't use the default CA list built in # to OpenSSL. #Default: # none # TAG: sslproxy_cert_error # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Use this ACL to bypass server certificate validation errors. # # For example, the following lines will bypass all validation errors # when talking to servers located at 172.16.0.0/16. All other # validation errors will result in ERR_SECURE_CONNECT_FAIL error. # # acl BrokenServersAtTrustedIP dst 172.16.0.0/16 # sslproxy_cert_error allow BrokenServersAtTrustedIP # sslproxy_cert_error deny all # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. # Using slow acl types may result in server crashes # # Without this option, all server certificate validation errors # terminate the transaction. Bypassing validation errors is dangerous # because an error usually implies that the server cannot be trusted and # the connection may be insecure. # # See also: sslproxy_flags and DONT_VERIFY_PEER. # # Default setting: sslproxy_cert_error deny all #Default: # none # TAG: sslpassword_program # Note: This option is only available if Squid is rebuilt with the # --enable-ssl option # # Specify a program used for entering SSL key passphrases # when using encrypted SSL certificate keys. If not specified # keys must either be unencrypted, or Squid started with the -N # option to allow it to query interactively for the passphrase. # # The key file name is given as argument to the program allowing # selection of the right password if you have multiple encrypted # keys. #Default: # none #OPTIONS RELATING TO EXTERNAL SSL_CRTD #----------------------------------------------------------------------------- # TAG: sslcrtd_program # Note: This option is only available if Squid is rebuilt with the # -DUSE_SSL_CRTD define # # Specify the location and options of the executable for ssl_crtd process. # /usr/lib/squid3/ssl_crtd program requires -s and -M parameters # For more information use: # /usr/lib/squid3/ssl_crtd -h #Default: # sslcrtd_program /usr/lib/squid3/ssl_crtd -s /var/lib/ssl_db -M 4MB # TAG: sslcrtd_children # Note: This option is only available if Squid is rebuilt with the # -DUSE_SSL_CRTD define # # The maximum number of processes spawn to service ssl server. # The maximum this may be safely set to is 32. # # You must have at least one ssl_crtd process. #Default: # sslcrtd_children 5 # OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM # ----------------------------------------------------------------------------- # TAG: cache_peer # To specify other caches in a hierarchy, use the format: # # cache_peer hostname type http-port icp-port [options] # # For example, # # # proxy icp # # hostname type port port options # # -------------------- -------- ----- ----- ----------- # cache_peer parent.foo.net parent 3128 3130 default # cache_peer sib1.foo.net sibling 3128 3130 proxy-only # cache_peer sib2.foo.net sibling 3128 3130 proxy-only # cache_peer example.com parent 80 0 default # cache_peer cdn.example.com sibling 3128 0 # # type: either 'parent', 'sibling', or 'multicast'. # # proxy-port: The port number where the peer accept HTTP requests. # For other Squid proxies this is usually 3128 # For web servers this is usually 80 # # icp-port: Used for querying neighbor caches about objects. # Set to 0 if the peer does not support ICP or HTCP. # See ICP and HTCP options below for additional details. # # # ==== ICP OPTIONS ==== # # You MUST also set icp_port and icp_access explicitly when using these options. # The defaults will prevent peer traffic using ICP. # # # no-query Disable ICP queries to this neighbor. # # multicast-responder # Indicates the named peer is a member of a multicast group. # ICP queries will not be sent directly to the peer, but ICP # replies will be accepted from it. # # closest-only Indicates that, for ICP_OP_MISS replies, we'll only forward # CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes. # # background-ping # To only send ICP queries to this neighbor infrequently. # This is used to keep the neighbor round trip time updated # and is usually used in conjunction with weighted-round-robin. # # # ==== HTCP OPTIONS ==== # # You MUST also set htcp_port and htcp_access explicitly when using these options. # The defaults will prevent peer traffic using HTCP. # # # htcp Send HTCP, instead of ICP, queries to the neighbor. # You probably also want to set the "icp-port" to 4827 # instead of 3130. # # htcp-oldsquid Send HTCP to old Squid versions. # # htcp-no-clr Send HTCP to the neighbor but without # sending any CLR requests. This cannot be used with # htcp-only-clr. # # htcp-only-clr Send HTCP to the neighbor but ONLY CLR requests. # This cannot be used with htcp-no-clr. # # htcp-no-purge-clr # Send HTCP to the neighbor including CLRs but only when # they do not result from PURGE requests. # # htcp-forward-clr # Forward any HTCP CLR requests this proxy receives to the peer. # # # ==== PEER SELECTION METHODS ==== # # The default peer selection method is ICP, with the first responding peer # being used as source. These options can be used for better load balancing. # # # default This is a parent cache which can be used as a "last-resort" # if a peer cannot be located by any of the peer-selection methods. # If specified more than once, only the first is used. # # round-robin Load-Balance parents which should be used in a round-robin # fashion in the absence of any ICP queries. # weight=N can be used to add bias. # # weighted-round-robin # Load-Balance parents which should be used in a round-robin # fashion with the frequency of each parent being based on the # round trip time. Closer parents are used more often. # Usually used for background-ping parents. # weight=N can be used to add bias. # # carp Load-Balance parents which should be used as a CARP array. # The requests will be distributed among the parents based on the # CARP load balancing hash function based on their weight. # # userhash Load-balance parents based on the client proxy_auth or ident username. # # sourcehash Load-balance parents based on the client source IP. # # multicast-siblings # To be used only for cache peers of type "multicast". # ALL members of this multicast group have "sibling" # relationship with it, not "parent". This is to a multicast # group when the requested object would be fetched only from # a "parent" cache, anyway. It's useful, e.g., when # configuring a pool of redundant Squid proxies, being # members of the same multicast group. # # # ==== PEER SELECTION OPTIONS ==== # # weight=N use to affect the selection of a peer during any weighted # peer-selection mechanisms. # The weight must be an integer; default is 1, # larger weights are favored more. # This option does not affect parent selection if a peering # protocol is not in use. # # basetime=N Specify a base amount to be subtracted from round trip # times of parents. # It is subtracted before division by weight in calculating # which parent to fectch from. If the rtt is less than the # base time the rtt is set to a minimal value. # # ttl=N Specify a TTL to use when sending multicast ICP queries # to this address. # Only useful when sending to a multicast group. # Because we don't accept ICP replies from random # hosts, you must configure other group members as # peers with the 'multicast-responder' option. # # no-delay To prevent access to this neighbor from influencing the # delay pools. # # digest-url=URL Tell Squid to fetch the cache digest (if digests are # enabled) for this host from the specified URL rather # than the Squid default location. # # # ==== ACCELERATOR / REVERSE-PROXY OPTIONS ==== # # originserver Causes this parent to be contacted as an origin server. # Meant to be used in accelerator setups when the peer # is a web server. # # forceddomain=name # Set the Host header of requests forwarded to this peer. # Useful in accelerator setups where the server (peer) # expects a certain domain name but clients may request # others. ie example.com or http://www.example.com # # no-digest Disable request of cache digests. # # no-netdb-exchange # Disables requesting ICMP RTT database (NetDB). # # # ==== AUTHENTICATION OPTIONS ==== # # login=user:password # If this is a personal/workgroup proxy and your parent # requires proxy authentication. # # Note: The string can include URL escapes (i.e. %20 for # spaces). This also means % must be written as %%. # # login=PROXYPASS # Send login details received from client to this peer. # Authentication is not required, nor changed. # # Note: This will pass any form of authentication but # only Basic auth will work through a proxy unless the # connection-auth options are also used. # # login=PASS Send login details received from client to this peer. # Authentication is not required by this option. # If there are no client-provided authentication headers # to pass on, but username and password are available # from either proxy login or an external ACL user= and # password= result tags they may be sent instead. # # Note: To combine this with proxy_auth both proxies must # share the same user database as HTTP only allows for # a single login (one for proxy, one for origin server). # Also be warned this will expose your users proxy # password to the peer. USE WITH CAUTION # # login=*:password # Send the username to the upstream cache, but with a # fixed password. This is meant to be used when the peer # is in another administrative domain, but it is still # needed to identify each user. # The star can optionally be followed by some extra # information which is added to the username. This can # be used to identify this proxy to the peer, similar to # the login=username:password option above. # # connection-auth=on|off # Tell Squid that this peer does or not support Microsoft # connection oriented authentication, and any such # challenges received from there should be ignored. # Default is auto to automatically determine the status # of the peer. # # # ==== SSL / HTTPS / TLS OPTIONS ==== # # ssl Encrypt connections to this peer with SSL/TLS. # # sslcert=/path/to/ssl/certificate # A client SSL certificate to use when connecting to # this peer. # # sslkey=/path/to/ssl/key # The private SSL key corresponding to sslcert above. # If 'sslkey' is not specified 'sslcert' is assumed to # reference a combined file containing both the # certificate and the key. # # Notes: # # On Debian/Ubuntu systems a default snakeoil certificate is # available in /etc/ss and users can set: # # cert=/etc/ssl/certs/ssl-cert-snakeoil.pem # # and # # key=/etc/ssl/private/ssl-cert-snakeoil.key # # for testing. # # sslversion=1|2|3|4 # The SSL version to use when connecting to this peer # 1 = automatic (default) # 2 = SSL v2 only # 3 = SSL v3 only # 4 = TLS v1 only # # sslcipher=... The list of valid SSL ciphers to use when connecting # to this peer. # # ssloptions=... Specify various SSL engine options: # NO_SSLv2 Disallow the use of SSLv2 # NO_SSLv3 Disallow the use of SSLv3 # NO_TLSv1 Disallow the use of TLSv1 # See src/ssl_support.c or the OpenSSL documentation for # a more complete list. # # sslcafile=... A file containing additional CA certificates to use # when verifying the peer certificate. # # sslcapath=... A directory containing additional CA certificates to # use when verifying the peer certificate. # # sslcrlfile=... A certificate revocation list file to use when # verifying the peer certificate. # # sslflags=... Specify various flags modifying the SSL implementation: # # DONT_VERIFY_PEER # Accept certificates even if they fail to # verify. # NO_DEFAULT_CA # Don't use the default CA list built in # to OpenSSL. # DONT_VERIFY_DOMAIN # Don't verify the peer certificate # matches the server name # # ssldomain= The peer name as advertised in it's certificate. # Used for verifying the correctness of the received peer # certificate. If not specified the peer hostname will be # used. # # front-end-https # Enable the "Front-End-Https: On" header needed when # using Squid as a SSL frontend in front of Microsoft OWA. # See MS KB document Q307347 for details on this header. # If set to auto the header will only be added if the # request is forwarded as a https:// URL. # # # ==== GENERAL OPTIONS ==== # # connect-timeout=N # A peer-specific connect timeout. # Also see the peer_connect_timeout directive. # # connect-fail-limit=N # How many times connecting to a peer must fail before # it is marked as down. Default is 10. # # allow-miss Disable Squid's use of only-if-cached when forwarding # requests to siblings. This is primarily useful when # icp_hit_stale is used by the sibling. To extensive use # of this option may result in forwarding loops, and you # should avoid having two-way peerings with this option. # For example to deny peer usage on requests from peer # by denying cache_peer_access if the source is a peer. # # max-conn=N Limit the amount of connections Squid may open to this # peer. see also # # name=xxx Unique name for the peer. # Required if you have multiple peers on the same host # but different ports. # This name can be used in cache_peer_access and similar # directives to dentify the peer. # Can be used by outgoing access controls through the # peername ACL type. # # no-tproxy Do not use the client-spoof TPROXY support when forwarding # requests to this peer. Use normal address selection instead. # # proxy-only objects fetched from the peer will not be stored locally. # #Default: # none # TAG: cache_peer_domain # Use to limit the domains for which a neighbor cache will be # queried. Usage: # # cache_peer_domain cache-host domain [domain ...] # cache_peer_domain cache-host !domain # # For example, specifying # # cache_peer_domain parent.foo.net .edu # # has the effect such that UDP query packets are sent to # 'bigserver' only when the requested object exists on a # server in the .edu domain. Prefixing the domainname # with '!' means the cache will be queried for objects # NOT in that domain. # # NOTE: * Any number of domains may be given for a cache-host, # either on the same or separate lines. # * When multiple domains are given for a particular # cache-host, the first matched domain is applied. # * Cache hosts with no domain restrictions are queried # for all requests. # * There are no defaults. # * There is also a 'cache_peer_access' tag in the ACL # section. #Default: # none # TAG: cache_peer_access # Similar to 'cache_peer_domain' but provides more flexibility by # using ACL elements. # # cache_peer_access cache-host allow|deny [!]aclname ... # # The syntax is identical to 'http_access' and the other lists of # ACL elements. See the comments for 'http_access' below, or # the Squid FAQ (http://wiki.squid-cache.org/SquidFaq/SquidAcl). #Default: # none # TAG: neighbor_type_domain # usage: neighbor_type_domain neighbor parent|sibling domain domain ... # # Modifying the neighbor type for specific domains is now # possible. You can treat some domains differently than the the # default neighbor type specified on the 'cache_peer' line. # Normally it should only be necessary to list domains which # should be treated differently because the default neighbor type # applies for hostnames which do not match domains listed here. # #EXAMPLE: # cache_peer cache.foo.org parent 3128 3130 # neighbor_type_domain cache.foo.org sibling .com .net # neighbor_type_domain cache.foo.org sibling .au .de #Default: # none # TAG: dead_peer_timeout (seconds) # This controls how long Squid waits to declare a peer cache # as "dead." If there are no ICP replies received in this # amount of time, Squid will declare the peer dead and not # expect to receive any further ICP replies. However, it # continues to send ICP queries, and will mark the peer as # alive upon receipt of the first subsequent ICP reply. # # This timeout also affects when Squid expects to receive ICP # replies from peers. If more than 'dead_peer' seconds have # passed since the last ICP reply was received, Squid will not # expect to receive an ICP reply on the next query. Thus, if # your time between requests is greater than this timeout, you # will see a lot of requests sent DIRECT to origin servers # instead of to your parents. #Default: # dead_peer_timeout 10 seconds # TAG: forward_max_tries # Controls how many different forward paths Squid will try # before giving up. See also forward_timeout. #Default: # forward_max_tries 10 # TAG: hierarchy_stoplist # A list of words which, if found in a URL, cause the object to # be handled directly by this cache. In other words, use this # to not query neighbor caches for certain objects. You may # list this option multiple times. # # Example: # hierarchy_stoplist cgi-bin ? # # Note: never_direct overrides this option. #Default: # none # MEMORY CACHE OPTIONS # ----------------------------------------------------------------------------- # TAG: cache_mem (bytes) # NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE. # IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL # USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER # THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS. # # 'cache_mem' specifies the ideal amount of memory to be used # for: # * In-Transit objects # * Hot Objects # * Negative-Cached objects # # Data for these objects are stored in 4 KB blocks. This # parameter specifies the ideal upper limit on the total size of # 4 KB blocks allocated. In-Transit objects take the highest # priority. # # In-transit objects have priority over the others. When # additional space is needed for incoming data, negative-cached # and hot objects will be released. In other words, the # negative-cached and hot objects will fill up any unused space # not needed for in-transit objects. # # If circumstances require, this limit will be exceeded. # Specifically, if your incoming request rate requires more than # 'cache_mem' of memory to hold in-transit objects, Squid will # exceed this limit to satisfy the new requests. When the load # decreases, blocks will be freed until the high-water mark is # reached. Thereafter, blocks will be used to store hot # objects. #Default: [b]cache_mem 256 MB[/b] # TAG: maximum_object_size_in_memory (bytes) # Objects greater than this size will not be attempted to kept in # the memory cache. This should be set high enough to keep objects # accessed frequently in memory to improve performance whilst low # enough to keep larger objects from hoarding cache_mem. #Default: # maximum_object_size_in_memory 512 KB # TAG: memory_replacement_policy # The memory replacement policy parameter determines which # objects are purged from memory when memory space is needed. # # See cache_replacement_policy for details. #Default: # memory_replacement_policy lru # DISK CACHE OPTIONS # ----------------------------------------------------------------------------- # TAG: cache_replacement_policy # The cache replacement policy parameter determines which # objects are evicted (replaced) when disk space is needed. # # lru : Squid's original list based LRU policy # heap GDSF : Greedy-Dual Size Frequency # heap LFUDA: Least Frequently Used with Dynamic Aging # heap LRU : LRU policy implemented using a heap # # Applies to any cache_dir lines listed below this. # # The LRU policies keeps recently referenced objects. # # The heap GDSF policy optimizes object hit rate by keeping smaller # popular objects in cache so it has a better chance of getting a # hit. It achieves a lower byte hit rate than LFUDA though since # it evicts larger (possibly popular) objects. # # The heap LFUDA policy keeps popular objects in cache regardless of # their size and thus optimizes byte hit rate at the expense of # hit rate since one large, popular object will prevent many # smaller, slightly less popular objects from being cached. # # Both policies utilize a dynamic aging mechanism that prevents # cache pollution that can otherwise occur with frequency-based # replacement policies. # # NOTE: if using the LFUDA replacement policy you should increase # the value of maximum_object_size above its default of 4096 KB to # to maximize the potential byte hit rate improvement of LFUDA. # # For more information about the GDSF and LFUDA cache replacement # policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html # and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html. #Default: # cache_replacement_policy lru # TAG: cache_dir # Usage: # # cache_dir Type Directory-Name Fs-specific-data [options] # # You can specify multiple cache_dir lines to spread the # cache among different disk partitions. # # Type specifies the kind of storage system to use. Only "ufs" # is built by default. To enable any of the other storage systems # see the --enable-storeio configure option. # # 'Directory' is a top-level directory where cache swap # files will be stored. If you want to use an entire disk # for caching, this can be the mount-point directory. # The directory must exist and be writable by the Squid # process. Squid will NOT create this directory for you. # # The ufs store type: # # "ufs" is the old well-known Squid storage format that has always # been there. # # cache_dir ufs Directory-Name Mbytes L1 L2 [options] # # 'Mbytes' is the amount of disk space (MB) to use under this # directory. The default is 100 MB. Change this to suit your # configuration. Do NOT put the size of your disk drive here. # Instead, if you want Squid to use the entire disk drive, # subtract 20% and use that value. # # 'L1' is the number of first-level subdirectories which # will be created under the 'Directory'. The default is 16. # # 'L2' is the number of second-level subdirectories which # will be created under each first-level directory. The default # is 256. # # The aufs store type: # # "aufs" uses the same storage format as "ufs", utilizing # POSIX-threads to avoid blocking the main Squid process on # disk-I/O. This was formerly known in Squid as async-io. # # cache_dir aufs Directory-Name Mbytes L1 L2 [options] # # see argument descriptions under ufs above # # The diskd store type: # # "diskd" uses the same storage format as "ufs", utilizing a # separate process to avoid blocking the main Squid process on # disk-I/O. # # cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n] # # see argument descriptions under ufs above # # Q1 specifies the number of unacknowledged I/O requests when Squid # stops opening new files. If this many messages are in the queues, # Squid won't open new files. Default is 64 # # Q2 specifies the number of unacknowledged messages when Squid # starts blocking. If this many messages are in the queues, # Squid blocks until it receives some replies. Default is 72 # # When Q1 Q2, the cache directory is optimized for # higher hit ratio at the expense of an increase in response # time. # # The coss store type: # # NP: COSS filesystem in Squid-3 has been deemed too unstable for # production use and has thus been removed from this release. # We hope that it can be made usable again soon. # # block-size=n defines the "block size" for COSS cache_dir's. # Squid uses file numbers as block numbers. Since file numbers # are limited to 24 bits, the block size determines the maximum # size of the COSS partition. The default is 512 bytes, which # leads to a maximum cache_dir size of 512 # # Defines an access log format. # # The is a string with embedded % format codes # # % format codes all follow the same basic structure where all but # the formatcode is optional. Output strings are automatically escaped # as required according to their context and the output format # modifiers are usually not needed, but can be specified if an explicit # output format is desired. # # % ["|[|'|#] [-] [[0]width] [{argument}] formatcode # # " output in quoted string format # [ output in squid text log format as used by log_mime_hdrs # # output in URL quoted format # ' output as-is # # - left aligned # width field width. If starting with 0 the # output is zero padded # {arg} argument such as header name etc # # Format codes: # # % a literal % character # >a Client source IP address # >A Client FQDN # >p Client source port # h Original request header. Optional header name argument # on the format header[:[separator]element] # [http::]>ha The HTTP request headers after adaptation and redirection. # Optional header name argument as for >h # [http::]h # [http::]un User name # [http::]ul User name from authentication # [http::]ui User name from ident # [http::]us User name from SSL # [http::]ue User name from external acl helper # [http::]>Hs HTTP status code sent to the client # [http::]st Received request size including HTTP headers. In the # case of chunked requests the chunked encoding metadata # are not included # [http::]>sh Received HTTP request headers size # [http::]a %Ss/%03>Hs %a %Ss/%03>Hs %h] [%a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %h" "%{User-Agent}>h" %Ss:%Sh #Default: # none # TAG: access_log # These files log client request activities. Has a line every HTTP or # ICP request. The format is: # access_log [ [acl acl ...]] # access_log none [acl acl ...]] # # Will log to the specified file using the specified format (which # must be defined in a logformat directive) those entries which match # ALL the acl's specified (which must be defined in acl clauses). # # If no acl is specified, all requests will be logged to this file. # # To disable logging of a request use the filepath "none", in which case # a logformat name should not be specified. # # To log the request via syslog specify a filepath of "syslog": # # access_log syslog[:facility.priority] [format [acl1 [acl2 ....]]] # where facility could be any of: # authpriv, daemon, local0 .. local7 or user. # # And priority could be any of: # err, warning, notice, info, debug. # # Default: # access_log /var/log/squid3/access.log squid #Default: # access_log /var/log/squid3/access.log squid # TAG: icap_log # ICAP log files record ICAP transaction summaries, one line per # transaction. # # The icap_log option format is: # icap_log [ [acl acl ...]] # icap_log none [acl acl ...]] # # Please see access_log option documentation for details. The two # kinds of logs share the overall configuration approach and many # features. # # ICAP processing of a single HTTP message or transaction may # require multiple ICAP transactions. In such cases, multiple # ICAP transaction log lines will correspond to a single access # log line. # # ICAP log uses logformat codes that make sense for an ICAP # transaction. Header-related codes are applied to the HTTP header # embedded in an ICAP server response, with the following caveats: # For REQMOD, there is no HTTP response header unless the ICAP # server performed request satisfaction. For RESPMOD, the HTTP # request header is the header sent to the ICAP server. For # OPTIONS, there are no HTTP headers. # # The following format codes are also available for ICAP logs: # # icap::st Bytes sent to the ICAP server (TCP payload # only; i.e., what Squid writes to the socket). # # icap::h ICAP request header(s). Similar to >h. # # icap::a %icap::to/%03icap::Hs %icap::'. # # Note, from Squid-3.1 this option has no effect on the cache.log, # that log can be rotated separately by using debug_options # # Note2, for Debian/Linux the default of logfile_rotate is # zero, since it includes external logfile-rotation methods. #Default: # logfile_rotate 0 # TAG: emulate_httpd_log on|off # The Cache can emulate the log file format which many 'httpd' # programs use. To disable/enable this emulation, set # emulate_httpd_log to 'off' or 'on'. The default # is to use the native log format since it includes useful # information Squid-specific log analyzers use. #Default: # emulate_httpd_log off # TAG: log_ip_on_direct on|off # Log the destination IP address in the hierarchy log tag when going # direct. Earlier Squid versions logged the hostname here. If you # prefer the old way set this to off. #Default: # log_ip_on_direct on # TAG: mime_table # Pathname to Squid's MIME table. You shouldn't need to change # this, but the default file contains examples and formatting # information if you do. #Default: # mime_table /usr/share/squid3/mime.conf # TAG: log_mime_hdrs on|off # The Cache can record both the request and the response MIME # headers for each HTTP transaction. The headers are encoded # safely and will appear as two bracketed fields at the end of # the access log (for either the native or httpd-emulated log # formats). To enable this logging set log_mime_hdrs to 'on'. #Default: # log_mime_hdrs off # TAG: useragent_log # Note: This option is only available if Squid is rebuilt with the # --enable-useragent-log option # # Squid will write the User-Agent field from HTTP requests # to the filename specified here. By default useragent_log # is disabled. #Default: # none # TAG: referer_log # Note: This option is only available if Squid is rebuilt with the # --enable-referer-log option # # Squid will write the Referer field from HTTP requests to the # filename specified here. By default referer_log is disabled. # Note that "referer" is actually a misspelling of "referrer" # however the misspelt version has been accepted into the HTTP RFCs # and we accept both. #Default: # none # TAG: pid_filename # A filename to write the process-id to. To disable, enter "none". #Default: # pid_filename /var/run/squid3.pid # TAG: log_fqdn on|off # Turn this on if you wish to log fully qualified domain names # in the access.log. To do this Squid does a DNS lookup of all # IP's connecting to it. This can (in some situations) increase # latency, which makes your cache seem slower for interactive # browsing. #Default: # log_fqdn off # TAG: client_netmask # A netmask for client addresses in logfiles and cachemgr output. # Change this to protect the privacy of your cache clients. # A netmask of 255.255.255.0 will log all IP's in that range with # the last digit set to '0'. #Default: # client_netmask no_addr # TAG: forward_log # Note: This option is only available if Squid is rebuilt with the # -DWIP_FWD_LOG define # # Logs the server-side requests. # # This is currently work in progress. #Default: # none # TAG: strip_query_terms # By default, Squid strips query terms from requested URLs before # logging. This protects your user's privacy. #Default: # strip_query_terms on # TAG: buffered_logs on|off # cache.log log file is written with stdio functions, and as such # it can be buffered or unbuffered. By default it will be unbuffered. # Buffering it can speed up the writing slightly (though you are # unlikely to need to worry unless you run with tons of debugging # enabled in which case performance will suffer badly anyway..). #Default: # buffered_logs off # TAG: netdb_filename # Note: This option is only available if Squid is rebuilt with the # --enable-icmp option # # A filename where Squid stores it's netdb state between restarts. # To disable, enter "none". #Default: # netdb_filename /var/log/squid3/netdb.state # OPTIONS FOR TROUBLESHOOTING # ----------------------------------------------------------------------------- # TAG: cache_log # Cache logging file. This is where general information about # your cache's behavior goes. You can increase the amount of data # logged to this file and how often its rotated with "debug_options" #Default: # cache_log /var/log/squid3/cache.log # TAG: debug_options # Logging options are set as section,level where each source file # is assigned a unique section. Lower levels result in less # output, Full debugging (level 9) can result in a very large # log file, so be careful. # # The magic word "ALL" sets debugging levels for all sections. # We recommend normally running with "ALL,1". # # The rotate=N option can be used to keep more or less of these logs # than would otherwise be kept by logfile_rotate. # For most uses a single log should be enough to monitor current # events affecting Squid. #Default: # debug_options ALL,1 # TAG: coredump_dir # By default Squid leaves core files in the directory from where # it was started. If you set 'coredump_dir' to a directory # that exists, Squid will chdir() to that directory at startup # and coredump files will be left there. # #Default: # coredump_dir none # # Leave coredumps in the first cache dir coredump_dir /var/spool/squid3 # OPTIONS FOR FTP GATEWAYING # ----------------------------------------------------------------------------- # TAG: ftp_user # If you want the anonymous login password to be more informative # (and enable the use of picky ftp servers), set this to something # reasonable for your domain, like wwwuser@somewhere.net # # The reason why this is domainless by default is the # request can be made on the behalf of a user in any domain, # depending on how the cache is used. # Some ftp server also validate the email address is valid # (for example perl.com). #Default: # ftp_user Squid@ # TAG: ftp_list_width # Sets the width of ftp listings. This should be set to fit in # the width of a standard browser. Setting this too small # can cut off long filenames when browsing ftp sites. #Default: # ftp_list_width 32 # TAG: ftp_passive # If your firewall does not allow Squid to use passive # connections, turn off this option. # # Use of ftp_epsv_all option requires this to be ON. #Default: # ftp_passive on # TAG: ftp_epsv_all # FTP Protocol extensions permit the use of a special "EPSV ALL" command. # # NATs may be able to put the connection on a "fast path" through the # translator, as the EPRT command will never be used and therefore, # translation of the data portion of the segments will never be needed. # # When a client only expects to do two-way FTP transfers this may be # useful. # If squid finds that it must do a three-way FTP transfer after issuing # an EPSV ALL command, the FTP session will fail. # # If you have any doubts about this option do not use it. # Squid will nicely attempt all other connection methods. # # Requires ftp_passive to be ON (default) for any effect. #Default: # ftp_epsv_all off # TAG: ftp_epsv # FTP Protocol extensions permit the use of a special "EPSV" command. # # NATs may be able to put the connection on a "fast path" through the # translator using EPSV, as the EPRT command will never be used # and therefore, translation of the data portion of the segments # will never be needed. # # Turning this OFF will prevent EPSV being attempted. # WARNING: Doing so will convert Squid back to the old behavior with all # the related problems with external NAT devices/layers. # # Requires ftp_passive to be ON (default) for any effect. #Default: # ftp_epsv on # TAG: ftp_eprt # FTP Protocol extensions permit the use of a special "EPRT" command. # # This extension provides a protocol neutral alternative to the # IPv4-only PORT command. When supported it enables active FTP data # channels over IPv6 and efficient NAT handling. # # Turning this OFF will prevent EPRT being attempted and will skip # straight to using PORT for IPv4 servers. # # Some devices are known to not handle this extension correctly and # may result in crashes. Devices which suport EPRT enough to fail # cleanly will result in Squid attempting PORT anyway. This directive # should only be disabled when EPRT results in device failures. # # WARNING: Doing so will convert Squid back to the old behavior with all # the related problems with external NAT devices/layers and IPv4-only FTP. #Default: # ftp_eprt on # TAG: ftp_sanitycheck # For security and data integrity reasons Squid by default performs # sanity checks of the addresses of FTP data connections ensure the # data connection is to the requested server. If you need to allow # FTP connections to servers using another IP address for the data # connection turn this off. #Default: # ftp_sanitycheck on # TAG: ftp_telnet_protocol # The FTP protocol is officially defined to use the telnet protocol # as transport channel for the control connection. However, many # implementations are broken and does not respect this aspect of # the FTP protocol. # # If you have trouble accessing files with ASCII code 255 in the # path or similar problems involving this ASCII code you can # try setting this directive to off. If that helps, report to the # operator of the FTP server in question that their FTP server # is broken and does not follow the FTP standard. #Default: # ftp_telnet_protocol on # OPTIONS FOR EXTERNAL SUPPORT PROGRAMS # ----------------------------------------------------------------------------- # TAG: diskd_program # Specify the location of the diskd executable. # Note this is only useful if you have compiled in # diskd as one of the store io modules. #Default: # diskd_program /usr/lib/squid3/diskd # TAG: unlinkd_program # Specify the location of the executable for file deletion process. #Default: # unlinkd_program /usr/lib/squid3/unlinkd # TAG: pinger_program # Note: This option is only available if Squid is rebuilt with the # --enable-icmp option # # Specify the location of the executable for the pinger process. #Default: # pinger_program /usr/lib/squid3/pinger # TAG: pinger_enable # Note: This option is only available if Squid is rebuilt with the # --enable-icmp option # # Control whether the pinger is active at run-time. # Enables turning ICMP pinger on and off with a simple # squid -k reconfigure. #Default: # pinger_enable off # OPTIONS FOR URL REWRITING # ----------------------------------------------------------------------------- # TAG: url_rewrite_program # Specify the location of the executable URL rewriter to use. # Since they can perform almost any function there isn't one included. # # For each requested URL, the rewriter will receive on line with the format # # URL client_ip "/" fqdn user method [ kvpairs] # # In the future, the rewriter interface will be extended with # key=value pairs ("kvpairs" shown above). Rewriter programs # should be prepared to receive and possibly ignore additional # whitespace-separated tokens on each input line. # # And the rewriter may return a rewritten URL. The other components of # the request line does not need to be returned (ignored if they are). # # The rewriter can also indicate that a client-side redirect should # be performed to the new URL. This is done by prefixing the returned # URL with "301:" (moved permanently) or 302: (moved temporarily), etc. # # By default, a URL rewriter is not used. #Default: # none # TAG: url_rewrite_children # The number of redirector processes to spawn. If you start # too few Squid will have to wait for them to process a backlog of # URLs, slowing it down. If you start too many they will use RAM # and other system resources. #Default: # url_rewrite_children 5 # TAG: url_rewrite_concurrency # The number of requests each redirector helper can handle in # parallel. Defaults to 0 which indicates the redirector # is a old-style single threaded redirector. # # When this directive is set to a value >= 1 then the protocol # used to communicate with the helper is modified to include # a request ID in front of the request/response. The request # ID from the request must be echoed back with the response # to that request. #Default: # url_rewrite_concurrency 0 # TAG: url_rewrite_host_header # By default Squid rewrites any Host: header in redirected # requests. If you are running an accelerator this may # not be a wanted effect of a redirector. # # WARNING: Entries are cached on the result of the URL rewriting # process, so be careful if you have domain-virtual hosts. #Default: # url_rewrite_host_header on # TAG: url_rewrite_access # If defined, this access list specifies which requests are # sent to the redirector processes. By default all requests # are sent. # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none # TAG: url_rewrite_bypass # When this is 'on', a request will not go through the # redirector if all redirectors are busy. If this is 'off' # and the redirector queue grows too large, Squid will exit # with a FATAL error and ask you to increase the number of # redirectors. You should only enable this if the redirectors # are not critical to your caching system. If you use # redirectors for access control, and you enable this option, # users may have access to pages they should not # be allowed to request. #Default: # url_rewrite_bypass off # OPTIONS FOR TUNING THE CACHE # ----------------------------------------------------------------------------- # TAG: cache # A list of ACL elements which, if matched and denied, cause the request to # not be satisfied from the cache and the reply to not be cached. # In other words, use this to force certain objects to never be cached. # # You must use the words 'allow' or 'deny' to indicate whether items # matching the ACL should be allowed or denied into the cache. # # Default is to allow all to be cached. # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none # TAG: refresh_pattern # usage: refresh_pattern [-i] regex min percent max [options] # # By default, regular expressions are CASE-SENSITIVE. To make # them case-insensitive, use the -i option. # # 'Min' is the time (in minutes) an object without an explicit # expiry time should be considered fresh. The recommended # value is 0, any higher values may cause dynamic applications # to be erroneously cached unless the application designer # has taken the appropriate actions. # # 'Percent' is a percentage of the objects age (time since last # modification age) an object without explicit expiry time # will be considered fresh. # # 'Max' is an upper limit on how long objects without an explicit # expiry time will be considered fresh. # # options: override-expire # override-lastmod # reload-into-ims # ignore-reload # ignore-no-cache # ignore-no-store # ignore-must-revalidate # ignore-private # ignore-auth # refresh-ims # # override-expire enforces min age even if the server # sent an explicit expiry time (e.g., with the # Expires: header or Cache-Control: max-age). Doing this # VIOLATES the HTTP standard. Enabling this feature # could make you liable for problems which it causes. # # Note: override-expire does not enforce staleness - it only extends # freshness / min. If the server returns a Expires time which # is longer than your max time, Squid will still consider # the object fresh for that period of time. # # override-lastmod enforces min age even on objects # that were modified recently. # # reload-into-ims changes client no-cache or ``reload'' # to If-Modified-Since requests. Doing this VIOLATES the # HTTP standard. Enabling this feature could make you # liable for problems which it causes. # # ignore-reload ignores a client no-cache or ``reload'' # header. Doing this VIOLATES the HTTP standard. Enabling # this feature could make you liable for problems which # it causes. # # ignore-no-cache ignores any ``Pragma: no-cache'' and # ``Cache-control: no-cache'' headers received from a server. # The HTTP RFC never allows the use of this (Pragma) header # from a server, only a client, though plenty of servers # send it anyway. # # ignore-no-store ignores any ``Cache-control: no-store'' # headers received from a server. Doing this VIOLATES # the HTTP standard. Enabling this feature could make you # liable for problems which it causes. # # ignore-must-revalidate ignores any ``Cache-Control: must-revalidate`` # headers received from a server. Doing this VIOLATES # the HTTP standard. Enabling this feature could make you # liable for problems which it causes. # # ignore-private ignores any ``Cache-control: private'' # headers received from a server. Doing this VIOLATES # the HTTP standard. Enabling this feature could make you # liable for problems which it causes. # # ignore-auth caches responses to requests with authorization, # as if the originserver had sent ``Cache-control: public'' # in the response header. Doing this VIOLATES the HTTP standard. # Enabling this feature could make you liable for problems which # it causes. # # refresh-ims causes squid to contact the origin server # when a client issues an If-Modified-Since request. This # ensures that the client will receive an updated version # if one is available. # # Basically a cached object is: # # FRESH if expires max # FRESH if lm-factor bits 25 through 32 are "d" # -> bits 17 through 24 are "c" # -> bits 17 through 32 are "c * 256 + d" # # NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to # IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic. #Default: # none # TAG: delay_access # This is used to determine which delay pool a request falls into. # # delay_access is sorted per pool and the matching starts with pool 1, # then pool 2, ..., and finally pool N. The first delay pool where the # request is allowed is selected for the request. If it does not allow # the request to any pool then the request is not delayed (default). # # For example, if you want some_big_clients in delay # pool 1 and lotsa_little_clients in delay pool 2: # #Example: # delay_access 1 allow some_big_clients # delay_access 1 deny all # delay_access 2 allow lotsa_little_clients # delay_access 2 deny all # delay_access 3 allow authenticated_clients #Default: # none # TAG: delay_parameters # This defines the parameters for a delay pool. Each delay pool has # a number of "buckets" associated with it, as explained in the # description of delay_class. # # For a class 1 delay pool, the syntax is: # delay_pools pool 1 # delay_parameters pool aggregate # # For a class 2 delay pool: # delay_pools pool 2 # delay_parameters pool aggregate individual # # For a class 3 delay pool: # delay_pools pool 3 # delay_parameters pool aggregate network individual # # For a class 4 delay pool: # delay_pools pool 4 # delay_parameters pool aggregate network individual user # # For a class 5 delay pool: # delay_pools pool 5 # delay_parameters pool tagrate # # The option variables are: # # pool a pool number - ie, a number between 1 and the # number specified in delay_pools as used in # delay_class lines. # # aggregate the speed limit parameters for the aggregate bucket # (class 1, 2, 3). # # individual the speed limit parameters for the individual # buckets (class 2, 3). # # network the speed limit parameters for the network buckets # (class 3). # # user the speed limit parameters for the user buckets # (class 4). # # tagrate the speed limit parameters for the tag buckets # (class 5). # # A pair of delay parameters is written restore/maximum, where restore is # the number of bytes (not bits - modem and network speeds are usually # quoted in bits) per second placed into the bucket, and maximum is the # maximum number of bytes which can be in the bucket at any time. # # There must be one delay_parameters line for each delay pool. # # # For example, if delay pool number 1 is a class 2 delay pool as in the # above example, and is being used to strictly limit each host to 64Kbit/sec # (plus overheads), with no overall limit, the line is: # # delay_parameters 1 -1/-1 8000/8000 # # Note that 8 x 8000 KByte/sec -> 64Kbit/sec. # # Note that the figure -1 is used to represent "unlimited". # # # And, if delay pool number 2 is a class 3 delay pool as in the above # example, and you want to limit it to a total of 256Kbit/sec (strict limit) # with each 8-bit network permitted 64Kbit/sec (strict limit) and each # individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits # to permit a decent web page to be downloaded at a decent speed # (if the network is not being limited due to overuse) but slow down # large downloads more significantly: # # delay_parameters 2 32000/32000 8000/8000 600/8000 # # Note that 8 x 32000 KByte/sec -> 256Kbit/sec. # 8 x 8000 KByte/sec -> 64Kbit/sec. # 8 x 600 Byte/sec -> 4800bit/sec. # # # Finally, for a class 4 delay pool as in the example - each user will # be limited to 128Kbits/sec no matter how many workstations they are logged into.: # # delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000 #Default: # none # TAG: delay_initial_bucket_level (percent, 0-100) # The initial bucket percentage is used to determine how much is put # in each bucket when squid starts, is reconfigured, or first notices # a host accessing it (in class 2 and class 3, individual hosts and # networks only have buckets associated with them once they have been # "seen" by squid). #Default: # delay_initial_bucket_level 50 # WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS # ----------------------------------------------------------------------------- # TAG: wccp_router # Use this option to define your WCCP ``home'' router for # Squid. # # wccp_router supports a single WCCP(v1) router # # wccp2_router supports multiple WCCPv2 routers # # only one of the two may be used at the same time and defines # which version of WCCP to use. #Default: # wccp_router any_addr # TAG: wccp2_router # Use this option to define your WCCP ``home'' router for # Squid. # # wccp_router supports a single WCCP(v1) router # # wccp2_router supports multiple WCCPv2 routers # # only one of the two may be used at the same time and defines # which version of WCCP to use. #Default: # none # TAG: wccp_version # This directive is only relevant if you need to set up WCCP(v1) # to some very old and end-of-life Cisco routers. In all other # setups it must be left unset or at the default setting. # It defines an internal version in the WCCP(v1) protocol, # with version 4 being the officially documented protocol. # # According to some users, Cisco IOS 11.2 and earlier only # support WCCP version 3. If you're using that or an earlier # version of IOS, you may need to change this value to 3, otherwise # do not specify this parameter. #Default: # wccp_version 4 # TAG: wccp2_rebuild_wait # If this is enabled Squid will wait for the cache dir rebuild to finish # before sending the first wccp2 HereIAm packet #Default: # wccp2_rebuild_wait on # TAG: wccp2_forwarding_method # WCCP2 allows the setting of forwarding methods between the # router/switch and the cache. Valid values are as follows: # # gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) # l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) # # Currently (as of IOS 12.4) cisco routers only support GRE. # Cisco switches only support the L2 redirect assignment method. #Default: # wccp2_forwarding_method gre # TAG: wccp2_return_method # WCCP2 allows the setting of return methods between the # router/switch and the cache for packets that the cache # decides not to handle. Valid values are as follows: # # gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) # l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) # # Currently (as of IOS 12.4) cisco routers only support GRE. # Cisco switches only support the L2 redirect assignment. # # If the "ip wccp redirect exclude in" command has been # enabled on the cache interface, then it is still safe for # the proxy server to use a l2 redirect method even if this # option is set to GRE. #Default: # wccp2_return_method gre # TAG: wccp2_assignment_method # WCCP2 allows the setting of methods to assign the WCCP hash # Valid values are as follows: # # hash - Hash assignment # mask - Mask assignment # # As a general rule, cisco routers support the hash assignment method # and cisco switches support the mask assignment method. #Default: # wccp2_assignment_method hash # TAG: wccp2_service # WCCP2 allows for multiple traffic services. There are two # types: "standard" and "dynamic". The standard type defines # one service id - http (id 0). The dynamic service ids can be from # 51 to 255 inclusive. In order to use a dynamic service id # one must define the type of traffic to be redirected; this is done # using the wccp2_service_info option. # # The "standard" type does not require a wccp2_service_info option, # just specifying the service id will suffice. # # MD5 service authentication can be enabled by adding # "password=" to the end of this service declaration. # # Examples: # # wccp2_service standard 0 # for the 'web-cache' standard service # wccp2_service dynamic 80 # a dynamic service type which will be # # fleshed out with subsequent options. # wccp2_service standard 0 password=foo #Default: # wccp2_service standard 0 # TAG: wccp2_service_info # Dynamic WCCPv2 services require further information to define the # traffic you wish to have diverted. # # The format is: # # wccp2_service_info protocol= flags=,.. # priority= ports=,.. # # The relevant WCCPv2 flags: # + src_ip_hash, dst_ip_hash # + source_port_hash, dst_port_hash # + src_ip_alt_hash, dst_ip_alt_hash # + src_port_alt_hash, dst_port_alt_hash # + ports_source # # The port list can be one to eight entries. # # Example: # # wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source # priority=240 ports=80 # # Note: the service id must have been defined by a previous # 'wccp2_service dynamic ' entry. #Default: # none # TAG: wccp2_weight # Each cache server gets assigned a set of the destination # hash proportional to their weight. #Default: # wccp2_weight 10000 # TAG: wccp_address #Default: # wccp_address 0.0.0.0 # TAG: wccp2_address # Use this option if you require WCCP to use a specific # interface address. # # The default behavior is to not bind to any specific address. #Default: # wccp2_address 0.0.0.0 # PERSISTENT CONNECTION HANDLING # ----------------------------------------------------------------------------- # # Also see "pconn_timeout" in the TIMEOUTS section # TAG: client_persistent_connections #Default: # client_persistent_connections on # TAG: server_persistent_connections # Persistent connection support for clients and servers. By # default, Squid uses persistent connections (when allowed) # with its clients and servers. You can use these options to # disable persistent connections with clients and/or servers. #Default: # server_persistent_connections on # TAG: persistent_connection_after_error # With this directive the use of persistent connections after # HTTP errors can be disabled. Useful if you have clients # who fail to handle errors on persistent connections proper. #Default: # persistent_connection_after_error on # TAG: detect_broken_pconn # Some servers have been found to incorrectly signal the use # of HTTP/1.0 persistent connections even on replies not # compatible, causing significant delays. This server problem # has mostly been seen on redirects. # # By enabling this directive Squid attempts to detect such # broken replies and automatically assume the reply is finished # after 10 seconds timeout. #Default: # detect_broken_pconn off # CACHE DIGEST OPTIONS # ----------------------------------------------------------------------------- # TAG: digest_generation # This controls whether the server will generate a Cache Digest # of its contents. By default, Cache Digest generation is # enabled if Squid is compiled with --enable-cache-digests defined. #Default: # digest_generation on # TAG: digest_bits_per_entry # This is the number of bits of the server's Cache Digest which # will be associated with the Digest entry for a given HTTP # Method and URL (public key) combination. The default is 5. #Default: # digest_bits_per_entry 5 # TAG: digest_rebuild_period (seconds) # This is the wait time between Cache Digest rebuilds. #Default: # digest_rebuild_period 1 hour # TAG: digest_rewrite_period (seconds) # This is the wait time between Cache Digest writes to # disk. #Default: # digest_rewrite_period 1 hour # TAG: digest_swapout_chunk_size (bytes) # This is the number of bytes of the Cache Digest to write to # disk at a time. It defaults to 4096 bytes (4KB), the Squid # default swap page. #Default: # digest_swapout_chunk_size 4096 bytes # TAG: digest_rebuild_chunk_percentage (percent, 0-100) # This is the percentage of the Cache Digest to be scanned at a # time. By default it is set to 10% of the Cache Digest. #Default: # digest_rebuild_chunk_percentage 10 # SNMP OPTIONS # ----------------------------------------------------------------------------- # TAG: snmp_port # The port number where Squid listens for SNMP requests. To enable # SNMP support set this to a suitable port number. Port number # 3401 is often used for the Squid SNMP agent. By default it's # set to "0" (disabled) # # Example: # snmp_port 3401 #Default: # snmp_port 0 # TAG: snmp_access # Allowing or denying access to the SNMP port. # # All access to the agent is denied by default. # usage: # # snmp_access allow|deny [!]aclname ... # # This clause only supports fast acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Example: # snmp_access allow snmppublic localhost # snmp_access deny all #Default: # snmp_access deny all # TAG: snmp_incoming_address #Default: # snmp_incoming_address any_addr # TAG: snmp_outgoing_address # Just like 'udp_incoming_address', but for the SNMP port. # # snmp_incoming_address is used for the SNMP socket receiving # messages from SNMP agents. # snmp_outgoing_address is used for SNMP packets returned to SNMP # agents. # # The default snmp_incoming_address is to listen on all # available network interfaces. # # If snmp_outgoing_address is not set it will use the same socket # as snmp_incoming_address. Only change this if you want to have # SNMP replies sent using another address than where this Squid # listens for SNMP queries. # # NOTE, snmp_incoming_address and snmp_outgoing_address can not have # the same value since they both use port 3401. #Default: # snmp_outgoing_address no_addr # ICP OPTIONS # ----------------------------------------------------------------------------- # TAG: icp_port # The port number where Squid sends and receives ICP queries to # and from neighbor caches. The standard UDP port for ICP is 3130. # Default is disabled (0). # # Example: # icp_port 3130 #Default: # icp_port 0 # TAG: htcp_port # The port number where Squid sends and receives HTCP queries to # and from neighbor caches. To turn it on you want to set it to # 4827. By default it is set to "0" (disabled). # # Example: # htcp_port 4827 #Default: # htcp_port 0 # TAG: log_icp_queries on|off # If set, ICP queries are logged to access.log. You may wish # do disable this if your ICP load is VERY high to speed things # up or to simplify log analysis. #Default: # log_icp_queries on # TAG: udp_incoming_address # udp_incoming_address is used for UDP packets received from other # caches. # # The default behavior is to not bind to any specific address. # # Only change this if you want to have all UDP queries received on # a specific interface/address. # # NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS # modules. Altering it will affect all of them in the same manner. # # see also; udp_outgoing_address # # NOTE, udp_incoming_address and udp_outgoing_address can not # have the same value since they both use the same port. #Default: # udp_incoming_address any_addr # TAG: udp_outgoing_address # udp_outgoing_address is used for UDP packets sent out to other # caches. # # The default behavior is to not bind to any specific address. # # Instead it will use the same socket as udp_incoming_address. # Only change this if you want to have UDP queries sent using another # address than where this Squid listens for UDP queries from other # caches. # # NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS # modules. Altering it will affect all of them in the same manner. # # see also; udp_incoming_address # # NOTE, udp_incoming_address and udp_outgoing_address can not # have the same value since they both use the same port. #Default: # udp_outgoing_address no_addr # TAG: icp_hit_stale on|off # If you want to return ICP_HIT for stale cache objects, set this # option to 'on'. If you have sibling relationships with caches # in other administrative domains, this should be 'off'. If you only # have sibling relationships with caches under your control, # it is probably okay to set this to 'on'. # If set to 'on', your siblings should use the option "allow-miss" # on their cache_peer lines for connecting to you. #Default: # icp_hit_stale off # TAG: minimum_direct_hops # If using the ICMP pinging stuff, do direct fetches for sites # which are no more than this many hops away. #Default: # minimum_direct_hops 4 # TAG: minimum_direct_rtt # If using the ICMP pinging stuff, do direct fetches for sites # which are no more than this many rtt milliseconds away. #Default: # minimum_direct_rtt 400 # TAG: netdb_low #Default: # netdb_low 900 # TAG: netdb_high # The low and high water marks for the ICMP measurement # database. These are counts, not percents. The defaults are # 900 and 1000. When the high water mark is reached, database # entries will be deleted until the low mark is reached. #Default: # netdb_high 1000 # TAG: netdb_ping_period # The minimum period for measuring a site. There will be at # least this much delay between successive pings to the same # network. The default is five minutes. #Default: # netdb_ping_period 5 minutes # TAG: query_icmp on|off # If you want to ask your peers to include ICMP data in their ICP # replies, enable this option. # # If your peer has configured Squid (during compilation) with # '--enable-icmp' that peer will send ICMP pings to origin server # sites of the URLs it receives. If you enable this option the # ICP replies from that peer will include the ICMP data (if available). # Then, when choosing a parent cache, Squid will choose the parent with # the minimal RTT to the origin server. When this happens, the # hierarchy field of the access.log will be # "CLOSEST_PARENT_MISS". This option is off by default. #Default: # query_icmp off # TAG: test_reachability on|off # When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH # instead of ICP_MISS if the target host is NOT in the ICMP # database, or has a zero RTT. #Default: # test_reachability off # TAG: icp_query_timeout (msec) # Normally Squid will automatically determine an optimal ICP # query timeout value based on the round-trip-time of recent ICP # queries. If you want to override the value determined by # Squid, set this 'icp_query_timeout' to a non-zero value. This # value is specified in MILLISECONDS, so, to use a 2-second # timeout (the old default), you would write: # # icp_query_timeout 2000 #Default: # icp_query_timeout 0 # TAG: maximum_icp_query_timeout (msec) # Normally the ICP query timeout is determined dynamically. But # sometimes it can lead to very large values (say 5 seconds). # Use this option to put an upper limit on the dynamic timeout # value. Do NOT use this option to always use a fixed (instead # of a dynamic) timeout value. To set a fixed timeout see the # 'icp_query_timeout' directive. #Default: # maximum_icp_query_timeout 2000 # TAG: minimum_icp_query_timeout (msec) # Normally the ICP query timeout is determined dynamically. But # sometimes it can lead to very small timeouts, even lower than # the normal latency variance on your link due to traffic. # Use this option to put an lower limit on the dynamic timeout # value. Do NOT use this option to always use a fixed (instead # of a dynamic) timeout value. To set a fixed timeout see the # 'icp_query_timeout' directive. #Default: # minimum_icp_query_timeout 5 # TAG: background_ping_rate time-units # Controls how often the ICP pings are sent to siblings that # have background-ping set. #Default: # background_ping_rate 10 seconds # MULTICAST ICP OPTIONS # ----------------------------------------------------------------------------- # TAG: mcast_groups # This tag specifies a list of multicast groups which your server # should join to receive multicasted ICP queries. # # NOTE! Be very careful what you put here! Be sure you # understand the difference between an ICP _query_ and an ICP # _reply_. This option is to be set only if you want to RECEIVE # multicast queries. Do NOT set this option to SEND multicast # ICP (use cache_peer for that). ICP replies are always sent via # unicast, so this option does not affect whether or not you will # receive replies from multicast group members. # # You must be very careful to NOT use a multicast address which # is already in use by another group of caches. # # If you are unsure about multicast, please read the Multicast # chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/). # # Usage: mcast_groups 239.128.16.128 224.0.1.20 # # By default, Squid doesn't listen on any multicast groups. #Default: # none # TAG: mcast_miss_addr # Note: This option is only available if Squid is rebuilt with the # -DMULTICAST_MISS_STREAM define # # If you enable this option, every "cache miss" URL will # be sent out on the specified multicast address. # # Do not enable this option unless you are are absolutely # certain you understand what you are doing. #Default: # mcast_miss_addr no_addr # TAG: mcast_miss_ttl # Note: This option is only available if Squid is rebuilt with the # -DMULTICAST_MISS_STREAM define # # This is the time-to-live value for packets multicasted # when multicasting off cache miss URLs is enabled. By # default this is set to 'site scope', i.e. 16. #Default: # mcast_miss_ttl 16 # TAG: mcast_miss_port # Note: This option is only available if Squid is rebuilt with the # -DMULTICAST_MISS_STREAM define # # This is the port number to be used in conjunction with # 'mcast_miss_addr'. #Default: # mcast_miss_port 3135 # TAG: mcast_miss_encode_key # Note: This option is only available if Squid is rebuilt with the # -DMULTICAST_MISS_STREAM define # # The URLs that are sent in the multicast miss stream are # encrypted. This is the encryption key. #Default: # mcast_miss_encode_key XXXXXXXXXXXXXXXX # TAG: mcast_icp_query_timeout (msec) # For multicast peers, Squid regularly sends out ICP "probes" to # count how many other peers are listening on the given multicast # address. This value specifies how long Squid should wait to # count all the replies. The default is 2000 msec, or 2 # seconds. #Default: # mcast_icp_query_timeout 2000 # INTERNAL ICON OPTIONS # ----------------------------------------------------------------------------- # TAG: icon_directory # Where the icons are stored. These are normally kept in # /usr/share/squid3/icons #Default: # icon_directory /usr/share/squid3/icons # TAG: global_internal_static # This directive controls is Squid should intercept all requests for # /squid-internal-static/ no matter which host the URL is requesting # (default on setting), or if nothing special should be done for # such URLs (off setting). The purpose of this directive is to make # icons etc work better in complex cache hierarchies where it may # not always be possible for all corners in the cache mesh to reach # the server generating a directory listing. #Default: # global_internal_static on # TAG: short_icon_urls # If this is enabled Squid will use short URLs for icons. # If disabled it will revert to the old behavior of including # it's own name and port in the URL. # # If you run a complex cache hierarchy with a mix of Squid and # other proxies you may need to disable this directive. #Default: # short_icon_urls on # ERROR PAGE OPTIONS # ----------------------------------------------------------------------------- # TAG: error_directory # If you wish to create your own versions of the default # error files to customize them to suit your company copy # the error/template files to another directory and point # this tag at them. # # WARNING: This option will disable multi-language support # on error pages if used. # # The squid developers are interested in making squid available in # a wide variety of languages. If you are making translations for a # language that Squid does not currently provide please consider # contributing your translation back to the project. # http://wiki.squid-cache.org/Translations # # The squid developers working on translations are happy to supply drop-in # translated error files in exchange for any new language contributions. #Default: # none # TAG: error_default_language # Set the default language which squid will send error pages in # if no existing translation matches the clients language # preferences. # # If unset (default) generic English will be used. # # The squid developers are interested in making squid available in # a wide variety of languages. If you are interested in making # translations for any language see the squid wiki for details. # http://wiki.squid-cache.org/Translations #Default: # none # TAG: error_log_languages # Log to cache.log what languages users are attempting to # auto-negotiate for translations. # # Successful negotiations are not logged. Only failures # have meaning to indicate that Squid may need an upgrade # of its error page translations. #Default: # error_log_languages on # TAG: err_page_stylesheet # CSS Stylesheet to pattern the display of Squid default error pages. # # For information on CSS see http://www.w3.org/Style/CSS/ #Default: # err_page_stylesheet /etc/squid3/errorpage.css # TAG: err_html_text # HTML text to include in error messages. Make this a "mailto" # URL to your admin address, or maybe just a link to your # organizations Web page. # # To include this in your error messages, you must rewrite # the error template files (found in the "errors" directory). # Wherever you want the 'err_html_text' line to appear, # insert a %L tag in the error template file. #Default: # none # TAG: email_err_data on|off # If enabled, information about the occurred error will be # included in the mailto links of the ERR pages (if %W is set) # so that the email body contains the data. # Syntax is %w #Default: # email_err_data on # TAG: deny_info # Usage: deny_info err_page_name acl # or deny_info http://... acl # or deny_info TCP_RESET acl # # This can be used to return a ERR_ page for requests which # do not pass the 'http_access' rules. Squid remembers the last # acl it evaluated in http_access, and if a 'deny_info' line exists # for that ACL Squid returns a corresponding error page. # # The acl is typically the last acl on the http_access deny line which # denied access. The exceptions to this rule are: # - When Squid needs to request authentication credentials. It's then # the first authentication related acl encountered # - When none of the http_access lines matches. It's then the last # acl processed on the last http_access line. # # NP: If providing your own custom error pages with error_directory # you may also specify them by your custom file name: # Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys # # Alternatively you can specify an error URL. The browsers will # get redirected (302 or 307) to the specified URL. %s in the redirection # URL will be replaced by the requested URL. # # Alternatively you can tell Squid to reset the TCP connection # by specifying TCP_RESET. #Default: # none # OPTIONS INFLUENCING REQUEST FORWARDING # ----------------------------------------------------------------------------- # TAG: nonhierarchical_direct # By default, Squid will send any non-hierarchical requests # (matching hierarchy_stoplist or not cacheable request type) direct # to origin servers. # # If you set this to off, Squid will prefer to send these # requests to parents. # # Note that in most configurations, by turning this off you will only # add latency to these request without any improvement in global hit # ratio. # # If you are inside an firewall see never_direct instead of # this directive. #Default: # nonhierarchical_direct on # TAG: prefer_direct # Normally Squid tries to use parents for most requests. If you for some # reason like it to first try going direct and only use a parent if # going direct fails set this to on. # # By combining nonhierarchical_direct off and prefer_direct on you # can set up Squid to use a parent as a backup path if going direct # fails. # # Note: If you want Squid to use parents for all requests see # the never_direct directive. prefer_direct only modifies how Squid # acts on cacheable requests. #Default: # prefer_direct off # TAG: always_direct # Usage: always_direct allow|deny [!]aclname ... # # Here you can use ACL elements to specify requests which should # ALWAYS be forwarded by Squid to the origin servers without using # any peers. For example, to always directly forward requests for # local servers ignoring any parents or siblings you may have use # something like: # # acl local-servers dstdomain my.domain.net # always_direct allow local-servers # # To always forward FTP requests directly, use # # acl FTP proto FTP # always_direct allow FTP # # NOTE: There is a similar, but opposite option named # 'never_direct'. You need to be aware that "always_direct deny # foo" is NOT the same thing as "never_direct allow foo". You # may need to use a deny rule to exclude a more-specific case of # some other rule. Example: # # acl local-external dstdomain external.foo.net # acl local-servers dstdomain .foo.net # always_direct deny local-external # always_direct allow local-servers # # NOTE: If your goal is to make the client forward the request # directly to the origin server bypassing Squid then this needs # to be done in the client configuration. Squid configuration # can only tell Squid how Squid should fetch the object. # # NOTE: This directive is not related to caching. The replies # is cached as usual even if you use always_direct. To not cache # the replies see the 'cache' directive. # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none # TAG: never_direct # Usage: never_direct allow|deny [!]aclname ... # # never_direct is the opposite of always_direct. Please read # the description for always_direct if you have not already. # # With 'never_direct' you can use ACL elements to specify # requests which should NEVER be forwarded directly to origin # servers. For example, to force the use of a proxy for all # requests, except those in your local domain use something like: # # acl local-servers dstdomain .foo.net # never_direct deny local-servers # never_direct allow all # # or if Squid is inside a firewall and there are local intranet # servers inside the firewall use something like: # # acl local-intranet dstdomain .foo.net # acl local-external dstdomain external.foo.net # always_direct deny local-external # always_direct allow local-intranet # never_direct allow all # # This clause supports both fast and slow acl types. # See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. #Default: # none # ADVANCED NETWORKING OPTIONS # ----------------------------------------------------------------------------- # TAG: incoming_icp_average #Default: # incoming_icp_average 6 # TAG: incoming_http_average #Default: # incoming_http_average 4 # TAG: incoming_dns_average #Default: # incoming_dns_average 4 # TAG: min_icp_poll_cnt #Default: # min_icp_poll_cnt 8 # TAG: min_dns_poll_cnt #Default: # min_dns_poll_cnt 8 # TAG: min_http_poll_cnt # Heavy voodoo here. 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