# WELCOME TO SQUID 1.2 # -------------------- # # This is the default Squid configuration file. You may wish # to look at http://cache.is.co.za/squid/ for documentation, # or the Squid home page (http://squid.nlanr.net/) for the FAQ. # # NETWORK OPTIONS # ----------------------------------------------------------------------------- # TAG: http_port # The port number where Squid will listen for HTTP client # requests. Default is 3128, for httpd-accel mode use port 80. # May be overridden with -a on the command line. # # You may specify multiple ports here, but they MUST all be on # a single line. # http_port 3128 # TAG: icp_port # The port number where Squid sends and receives ICP requests to # and from neighbor caches. Default is 3130. To disable use # "0". May be overridden with -u on the command line. # #icp_port 3130 # TAG: htcp_port # The port number where Squid sends and receives ICP requests to # and from neighbor caches. Default is 4827. To disable use # "0". # #htcp_port 4827 # TAG: mcast_groups # This tag specifies a list of multicast groups which your server # should join to receive multicasted ICP requests. # # 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. NLANR has been # assigned a block of multicast address space for use in Web # Caching. Plese write to us at nlanr-cache@nlanr.net to receive # an address for your own use. # # If you are unsure about multicast, please read the Multicast # chapter in the Squid FAQ (http://squid.nlanr.net/Squid/FAQ/). # # Usage: mcast_groups 239.128.16.128 224.0.1.20 # # By default, Squid doesn't listen on any multicast groups. # #mcast_groups 239.128.16.128 # TAG: tcp_incoming_address # TAG: tcp_outgoing_address # TAG: udp_incoming_address # TAG: udp_outgoing_address # Usage: tcp_incoming_address 10.20.30.40 # udp_outgoing_address fully.qualified.domain.name # # tcp_incoming_address is used for the HTTP socket which accepts # connections from clients and other caches. # tcp_outgoing_address is used for connections made to remote # servers and other caches. # udp_incoming_address is used for the ICP socket receiving packets # from other caches. # udp_outgoing_address is used for ICP packets sent out to other # caches. # # The default behaviour is to not bind to any specific address. # # NOTE, udp_incoming_address and udp_outgoing_address can not # have the same value (unless it is 0.0.0.0) since they both use # port 3130. # #tcp_incoming_address 0.0.0.0 #tcp_outgoing_address 0.0.0.0 #udp_incoming_address 0.0.0.0 #udp_outgoing_address 0.0.0.0 # OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM # ----------------------------------------------------------------------------- # TAG: cache_peer # To specify other caches in a hierarchy, use the format: # # hostname type http_port icp_port # # For example, # # # proxy icp # # hostname type port port options # # -------------------- -------- ----- ----- ----------- #cache_peer proxy.test.deere.com parent 80 # cache_peer sib1.foo.net sibling 3128 3130 [proxy-only] # cache_peer sib2.foo.net sibling 3128 3130 [proxy-only] # # type: either 'parent', 'sibling', or 'multicast'. # # proxy_port: The port number where the cache listens for proxy # requests. # # icp_port: Used for querying neighbor caches about # objects. To have a non-ICP neighbor # specify '7' for the ICP port and make sure the # neighbor machine has the UDP echo port # enabled in its /etc/inetd.conf file. # # options: proxy-only # weight=n # ttl=n # no-query # default # round-robin # multicast-responder # closest-only # no-digest # no-netdb-exchange # no-delay # # use 'proxy-only' to specify that objects fetched # from this cache should not be saved locally. # # use 'weight=n' to specify a weighted parent. # The weight must be an integer. The default weight # is 1, larger weights are favored more. # # use 'ttl=n' to specify a IP multicast TTL to use # when sending an ICP request 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 below. # # use 'no-query' to NOT send ICP queries to this # neighbor. # # use 'default' if this is a parent cache which can # be used as a "last-resort." You should probably # only use 'default' in situations where you cannot # use ICP with your parent cache(s). # # use 'round-robin' to define a set of parents which # should be used in a round-robin fashion in the # absence of any ICP queries. # # 'multicast-responder' indicates that 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. # # use 'no-digest' to NOT request cache digests from # this neighbor. # # 'no-netdb-exchange' disables requesting ICMP # RTT database (NetDB) from the neighbor. # # use 'no-delay' to prevent access to this neighbor # from influencing the delay pools. # # NOTE: non-ICP neighbors must be specified as 'parent'. # #cache_peer 204.54.68.130 parent 8000 3130 cache_host proxy.test.deere.com parent 8000 3130 no-query default # 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 that 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. # TAG: neighbor_type_domain # usage: neighbor_type_domain 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 parent cache.foo.org 3128 3130 # neighbor_type_domain cache.foo.org sibling .com .net # neighbor_type_domain cache.foo.org sibling .au .de # 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 # #icp_query_timeout 0 # 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. # #mcast_icp_query_timeout 2000 # 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. # #dead_peer_timeout 10 seconds # 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. # # The default is to directly fetch URLs containing 'cgi-bin' or '?'. # #hierarchy_stoplist cgi-bin ? # TAG: no_cache # A list of ACL elements which, if matched, cause the reply to # immediately removed from the cache. In other words, use this # to force certain objects to never be cached. # # You must use the word 'DENY' to indicate the ACL names which should # NOT be cached. # # There is no default. We recommend you uncomment the following # two lines. # #acl QUERY urlpath_regex cgi-bin \? #no_cache deny QUERY # OPTIONS WHICH AFFECT THE CACHE SIZE # ----------------------------------------------------------------------------- # TAG: cache_mem (bytes) # NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS # SIZE. IT PLACES A LIMIT ON ONE ASPECT OF SQUID'S MEMORY # USAGE. SQUID USES MEMORY FOR OTHER THINGS AS WELL. # YOUR PROCESS WILL PROBABLY BECOME TWICE OR THREE TIMES # BIGGER THAN THE VALUE YOU PUT HERE # # '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. # # The values of cache_mem_low and cache_mem_high (below) can be # used to tune the use of the memory pool. When the high mark is # reached, in-transit and hot objects will be released to clear # space. When an object transfer is completed, it will remain in # memory only if the current memory usage is below the low water # mark. # # The default is 8 Megabytes. # cache_mem 4 MB # TAG: cache_swap_low (percent, 0-100) # TAG: cache_swap_high (percent, 0-100) # The low- and high-water marks for cache LRU replacement. LRU # replacement begins when the high-water mark is reached and ends # when enough objects have been removed and the low-water mark is # reached. Defaults are 90% and 95%. If you have a large cache, 5% # could be hundreds of MB. If this is the case you may wish to # set these numbers closer together. # #cache_swap_low 90 #cache_swap_high 95 # TAG: cache_mem_low (in percent, 0-100) # TAG: cache_mem_high (in percent, 0-100) # The low- and high-water mark for cache memory storage. When # the amount of RAM used by the hot-object RAM cache reaches this # point, the cache starts throwing objects out of the RAM cache # (but they remain on disk). Defaults are 75% and 90%. # #cache_mem_low 75 #cache_mem_high 90 # TAG: maximum_object_size (bytes) # Objects larger than this size will NOT be saved on disk. The # value is specified in kilobytes, and the default is 4MB. If # you wish to get a high BYTES hit ratio, you should probably # increase this (one 32 MB object hit counts for 3200 10KB # hits). If you wish to increase speed more than your want to # save bandwidth you should leave this low. # maximum_object_size 4096 KB # TAG: ipcache_size (number of entries) # TAG: ipcache_low (percent) # TAG: ipcache_high (percent) # The size, low-, and high-water marks for the IP cache. # #ipcache_size 1024 #ipcache_low 90 #ipcache_high 95 # TAG: fqdncache_size (number of entries) # Maximum number of FQDN cache entries. #fqdncache_size 1024 # LOGFILE PATHNAMES AND CACHE DIRECTORIES # ----------------------------------------------------------------------------- # TAG: cache_dir # Usage: # # cache_dir Directory-Name Mbytes Level-1 Level2 # # You can specify multiple cache_dir lines to spread the # cache among different disk partitions. # # 'Directory' is a top-level directory where cache swap # files will be stored. If you want to use an entire disk # for caching, then 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. # # If no 'cache_dir' lines are specified, the following # default will be used: /usr/local/squid/cache. # # 'Mbytes' is the amount of disk space (MB) to use under this # directory. The default is 100 MB. Change this to suit your # configuration. # # 'Level-1' is the number of first-level subdirectories which # will be created under the 'Directory'. The default is 16. # # 'Level-2' is the number of second-level subdirectories which # will be created under each first-level directory. The default # is 256. # cache_dir /var/cache/squid 4000 16 256 # TAG: cache_access_log # Logs the client request activity. Contains an entry for # every HTTP and ICP request received. # cache_access_log /var/logs/squid/access.log # TAG: cache_log # Cache logging file. This is where general information about # your cache's behaviour goes. You can increase the amount of data # logged to this file with the "debug_options" tag below. # #cache_log /usr/local/squid/logs/cache.log # TAG: cache_store_log # Logs the activities of the storage manager. Shows which # objects are ejected from the cache, and which objects are # saved and for how long. To disable, enter "none". There are # not really utilities to analyse this data, so you can safely # disable it. # cache_store_log /var/logs/squid/store.log # TAG: cache_swap_log # Location for the cache "swap.log." This log file holds the # metadata of objects saved on disk. It is used to rebuild the # cache during startup. Normally this file resides in the first # 'cache_dir' directory, but you may specify an alternate # pathname here. Note you must give a full filename, not just # a directory. Since this is the index for the whole object # list you CANNOT periodically rotate it! # #cache_swap_log # 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 that Squid-specific log analysers use. # #emulate_httpd_log off # 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. # #mime_table /usr/local/squid/etc/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'. # #log_mime_hdrs off # TAG: useragent_log # If configured with the "--enable-useragent_log" configure # option, Squid will write the User-Agent field from HTTP # requests to the filename specified here. By default # useragent_log is disabled. # #useragent_log none # TAG: pid_filename # A filename to write the process-id to. To disable, enter "none". # #pid_filename /usr/local/squid/logs/squid.pid # 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". # debug_options ALL,1 28,9 # TAG: ident_lookup on|off # If you wish to make an RFC931/ident lookup of the client # username for each connection, enable this. It is off by # default. # ident_lookup off # 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. # 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'. # #client_netmask 255.255.255.255 # OPTIONS FOR EXTERNAL SUPPORT PROGRAMS # ----------------------------------------------------------------------------- # 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 # resonable for your domain, like wwwuser@somewhere.net # # The reason why this is domainless by default is that 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 that the email address is valid # (for example perl.com). # #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. # #ftp_list_width 32 # TAG: cache_dns_program # Specify the location of the executable for dnslookup process. # #cache_dns_program /usr/local/squid/bin/dnsserver # TAG: dns_children # The number of processes spawn to service DNS name lookups. # For heavily loaded caches on large servers, you should # probably increase this value to at least 10. The maximum # is 32. The default is 5. # # To disable dnsservers, set this to 0. NOTE, this is very # strongly discouraged. If you disable dnsservers your Squid # process will BLOCK on DNS lookups! # #dns_children 5 # TAG: dns_defnames on|off # Normally the 'dnsserver' disables the RES_DEFNAMES resolver # option (see res_init(3)). This prevents caches in a hierarchy # from interpreting single-component hostnames locally. To allow # dnsserver to handle single-component names, enable this # option. # #dns_defnames on # TAG: dns_nameservers # Use this if you want to specify a list of DNS name servers # (IP addresses) to use instead of those given in your # /etc/resolv.conf file. # # Example: dns_nameservers 10.0.0.1 192.172.0.4 # #dns_nameservers none # TAG: unlinkd_program # Specify the location of the executable for file deletion process. # This isn't needed if you are using async-io since it's handled by # a thread. # #unlinkd_program /usr/local/squid/bin/unlinkd # TAG: pinger_program # Specify the location of the executable for the pinger process. # This is only useful if you configured Squid (during compliation) # with the '--enable-icmp' option. # #pinger_program /usr/local/squid/bin/pinger # TAG: redirect_program # Specify the location of the executable for the URL redirector. # Since they can perform almost any function there isn't one included. # See the Release-Notes for information on how to write one. # By default, a redirector is not used. # #redirect_program none # TAG: redirect_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. # #redirect_children 5 # TAG: authenticate_program # 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. If you use an authenticator, # make sure you have 1 acl of type proxy_auth. By default, the # authenticator_program is not used. # # If you want to use the traditional proxy authentication, # jump over to the ../auth_modules/NCSA directory and # type: # % make # % make install # # Then, set this line to something like # # authenticate_program /usr/local/squid/bin/ncsa_auth /usr/local/squid/etc/passwd # #authenticate_program none # TAG: authenticate_children # The number of authenticator processes to spawn (default 5). If you # start too few Squid will have to wait for them to process a backlog # of usercode/password verifications, slowing it down. When password # verifications are done via a (slow) network you are likely to need # lots of authenticator processes. # #authenticate_children 5 # OPTIONS FOR TUNING THE CACHE # ----------------------------------------------------------------------------- # TAG: wais_relay_host # TAG: wais_relay_port # Relay WAIS request to host (1st arg) at port (2 arg). # #wais_relay_host localhost #wais_relay_port 8000 # TAG: request_size (KB) # Maximum allowed request size in kilobytes. If people are using # POST to upload files, then set this to the largest acceptable # filesize plus a few extra kbytes. # #request_size 100 KB # 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 and max are specified in MINUTES. # percent is an integer number. # # options: override-expire # override-lastmod # reload-into-ims # ignore-reload # # override-expire enforces min age even if the server # sent a Expires: header. Doing this VIOLATES the HTTP # standard. Enabling this feature could make you liable # for problems which it causes. # # override-lastmod enforces min age even on objects # that was 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. # # Please see the file doc/Release-Notes-1.1.txt for a full # description of Squid's refresh algorithm. Basically a # cached object is: (the order is changed from 1.1.X) # # STALE if age > max # FRESH if expires < now, else STALE # FRESH if lm-factor < percent, else STALE # FRESH if age < min # else STALE # # The refresh_pattern lines are checked in the order listed here. # The first entry which matches is used. If none of the entries # match, then the default will be used. # #Default: #refresh_pattern . 0 20% 4320 # TAG: reference_age # As a part of normal operation, Squid performs Least Recently # Used removal of cached objects. The LRU age for removal is # computed dynamically, based on the amount of disk space in # use. The dynamic value can be seen in the Cache Manager 'info' # output. # # The 'reference_age' parameter defines the maximum LRU age. For # example, setting reference_age to '1 week' will cause objects # to be removed if they have not been accessed for a week or # more. The default value is one month. # # Specify a number here, followed by units of time. For example: # 1 week # 3.5 days # 4 months # 2.2 hours # #reference_age 1 month # TAG: quick_abort_min (KB) # TAG: quick_abort_max (KB) # TAG: quick_abort_pct (percent) # The cache can be configured to continue downloading aborted # requests. This may be undesirable on slow (e.g. SLIP) links # and/or very busy caches. Impatient users may tie up file # descriptors and bandwidth by repeatedly requesting and # immediately aborting downloads. # # When the user aborts a request, Squid will check the # quick_abort values to the amount of data transfered until # then. # # If the transfer has less than 'quick_abort_min' KB remaining, # it will finish the retrieval. Setting 'quick_abort_min' to -1 # will disable the quick_abort feature. # # If the transfer has more than 'quick_abort_max' KB remaining, # it will abort the retrieval. # # If more than 'quick_abort_pct' of the transfer has completed, # it will finish the retrieval. # #quick_abort_min -1 KB #quick_abort_max 0 KB #quick_abort_pct 0 # TAG: negative_ttl time-units # Time-to-Live (TTL) for failed requests. Certain types of # failures (such as "connection refused" and "404 Not Found") are # negatively-cached for a configurable amount of time. The # default is 5 minutes. Note that this is different from # negative caching of DNS lookups. # negative_ttl 5 minutes # TAG: positive_dns_ttl time-units # Time-to-Live (TTL) for positive caching of successful DNS lookups. # Default is 6 hours (360 minutes). If you want to minimize the # use of Squid's ipcache, set this to 1, not 0. # positive_dns_ttl 6 hours # TAG: negative_dns_ttl time-units # Time-to-Live (TTL) for negative caching of failed DNS lookups. # negative_dns_ttl 5 minutes # TIMEOUTS # ----------------------------------------------------------------------------- # TAG: connect_timeout time-units # Some systems (notably Linux) can not be relied upon to properly # time out connect(2) requests. Therefore the Squid process # enforces its own timeout on server connections. This parameter # specifies how long to wait for the connect to complete. The # default is two minutes (120 seconds). # #connect_timeout 120 seconds # TAG: siteselect_timeout time-units # For URN to multiple URL's URL selection # #siteselect_timeout 4 seconds # TAG: read_timeout time-units # The read_timeout is applied on server-side connections. After # each successful read(), the timeout will be extended by this # amount. If no data is read again after this amount of time, # the request is aborted and logged with ERR_READ_TIMEOUT. The # default is 15 minutes. # read_timeout 15 minutes # TAG: request_timeout # How long to wait for an HTTP request after connection # establishment. For persistent connections, wait this long # after the previous request completes. # request_timeout 30 seconds # TAG: client_lifetime time-units # The maximum amount of time that a client (browser) is allowed to # remain connected to the cache process. This protects the Cache # from having alot of sockets (and hence file descriptors) tied up # in a CLOSE_WAIT state from remote clients that go away without # properly shutting down (either because of a network failure or # because of a poor client implementation). The default is one # day, 1440 minutes. # # NOTE: The default value is intended to be much larger than any # client would ever need to be connected to your cache. You # should probably change client_lifetime only as a last resort. # If you seem to have many client connections tying up # filedescriptors, we recommend first tuning the read_timeout, # request_timeout, pconn_timeout and quick_abort values. # #client_lifetime 1 day # TAG: half_closed_clients # Some clients may shutdown the sending side of their TCP # connections, while leaving their receiving sides open. Sometimes, # Squid can not tell the difference between a half-closed and a # fully-closed TCP connection. By default, half-closed client # connections are kept open until a read(2) or write(2) on the # socket returns an error. Change this option to 'off' and Squid # will immediately close client connections when read(2) returns # "no more data to read." # half_closed_clients on # TAG: pconn_timeout # Timeout for idle persistent connections to servers and other # proxies. pconn_timeout 120 seconds # TAG: shutdown_lifetime time-units # When SIGTERM or SIGHUP is received, the cache is put into # "shutdown pending" mode until all active sockets are closed. # This value is the lifetime to set for all open descriptors # during shutdown mode. Any active clients after this many # seconds will receive a 'timeout' message. # #shutdown_lifetime 30 seconds # ACCESS CONTROLS # ----------------------------------------------------------------------------- # TAG: acl # Defining an Access List # # acl aclname acltype string1 ... # acl aclname acltype "file" ... # # when using "file", the file should contain one item per line # # acltype is one of src dst srcdomain dstdomain url_pattern # urlpath_pattern time port proto method browser user # # acl aclname src ip-address/netmask ... (clients IP address) # acl aclname src addr1-addr2/netmask ... (range of addresses) # acl aclname dst ip-address/netmask ... (URL host's IP address) # # acl aclname srcdomain foo.com ... # reverse lookup, client IP # acl aclname dstdomain foo.com ... # Destination server from URL # acl aclname srcdom_regex xxx ... # regex matching client name # acl aclname dstdom_regex xxx ... # regex matching server # # For dstdomain and dstdom_regex a reverse lookup is tried if a IP # # based URL is used. The name "none" is used if the reverse lookup # # fails. # # acl aclname time [day-abbrevs] [h1:m1-h2:m2] # day-abbrevs: # S - Sunday # M - Monday # T - Tuesday # W - Wednesday # H - Thursday # F - Friday # A - Saturday # h1:m1 must be less than h2:m2 # acl aclname url_regex ^http:// ... # regex matching on whole URL # acl aclname urlpath_regex \.gif$ ... # regex matching on URL path # acl aclname port 80 70 21 ... # acl aclname port 0-1024 ... # ranges allowed # acl aclname proto HTTP FTP ... # acl aclname method GET POST ... # acl aclname browser regexp # acl aclname user username ... # string match on ident output. # # use REQUIRED to accept any # # non-null ident. # acl aclname src_as number ... # acl aclname dst_as number ... # # Except for access control, AS numbers can be used for # # routing of requests to specific caches. Here's an # # example for routing all requests for AS#1241 and only # # those to mycache.mydomain.net: # # acl asexample dst_as 1241 # # cache_peer_access mycache.mydomain.net allow asexample # # cache_peer_access mycache_mydomain.net deny all # # acl aclname proxy_auth [ refresh ] # # Use an EXTERNAL authentication program to check username/password # # combinations (see authenticate_program). # # # # 'timeout' is the time a checked username/password combination # # remains cached (default = 3600 secs). If a wrong password # # is given for a cached user, the user gets removed from the # # username/password cache forcing a revalidation. # # # # When using a proxy_auth ACL in an http_access rule, make sure # # it is the *last* in the list and the only proxy_auth ACL in # # the list. # # # # NOTE: when a Proxy-Authentication header is sent but it is not # # needed during ACL checking the username is NOT logged # # in access.log. # acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl all src 0.0.0.0/0.0.0.0 #acl myexample dst_as 1241 acl SSL_ports port 443 563 #acl Safe_ports port 80 21 70 1025-65535 acl CONNECT method CONNECT #acl password proxy_auth 300 # TAG: http_access # Allowing or Denying access based on defined access lists # # Access to the HTTP port: # http_access allow|deny [!]aclname ... # # Access to the ICP port: # icp_access allow|deny [!]aclname ... # # NOTE on default values: # # If there are no "access" lines present, the default is to allow # 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, then 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" or "allow all" entry at the end # of your access lists to avoid potential confusion. # # # Only allow access to the cache manager functions from the local host. #http_access deny manager !localhost #http_access deny CONNECT !SSL_ports #http_access deny !Safe_ports # # Allow everything else http_access allow all # TAG: icp_access # Reply to all ICP queries we receive # icp_access allow all # TAG: miss_access # Use to force your neighbors to use you as a sibling instead of # a parent. For example: # # acl localclients src 172.16.0.0/16 # miss_access allow localclients # miss_access deny !localclients # # This means that only your local clients are allowed to fetch # MISSES and all other clients can only fetch HITS. # # By default, allow all clients who passed the http_access rules # to fetch MISSES from us. # miss_access allow all # 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://squid.nlanr.net/Squid/FAQ/FAQ-10.html). # TAG: proxy_auth_realm # Specifies the realm name which is to be reported to the client for # proxy authentication (part of the text the user will see when # prompted their username and password). # #proxy_auth_realm Squid proxy-caching web server # ADMINISTRATIVE PARAMETERS # ----------------------------------------------------------------------------- # TAG: cache_mgr # Email-address of local cache manager who will receive # mail if the cache dies. The default is "webmaster." # cache_mgr squid # TAG: cache_effective_user # TAG: cache_effective_group # # If the cache is run as root, it will change its effective/real # UID/GID to the UID/GID specified below. The default is to # change to UID to nobody and GID to nogroup. # # If Squid is not started as root, the default is to keep the # current UID/GID. Note that if Squid is not started as root then # you cannot set http_port to a value lower than 1024. # cache_effective_user squid cache_effective_group squid # TAG: visible_hostname # If you want to present a special hostname in error messages, etc, # then define this. Otherwise, the return value of gethostname() # will be used. If you have multiple caches in a cluster and # get errors about IP-forwarding you must set them to have individual # names with this setting. # #visible_hostname www-cache.foo.org # TAG: unique_hostname # If you want to have multiple machines with the same # 'visible_hostname' then you must give each machine a different # 'unique_hostname' so that forwarding loops can be detected. # #unique_hostname www-cache1.foo.org # OPTIONS FOR THE CACHE REGISTRATION SERVICE # ----------------------------------------------------------------------------- # # This section contains parameters for the (optional) cache # announcement service. This service is provided to help # cache administrators locate one another in order to join or # create cache hierarchies. # # An 'announcement' message is sent (via UDP) to the registration # service by Squid. By default, the annoucement message is NOT # SENT unless you enable it with 'announce_period' below. # # The announcement message includes your hostname, plus the # following information from this configuration file: # # http_port # icp_port # cache_mgr # # All current information is processed regularly and made # available on the Web at http://ircache.nlanr.net/Cache/Tracker/. # TAG: announce_period # This is how frequently to send cache announcements. The # default is `0' which disables sending the announcement # messages. # # To enable announcing your cache, just uncomment the line # below. # #announce_period 1 day # TAG: announce_host # TAG: announce_file # TAG: announce_port # announce_host and announce_port set the hostname and port # number where the registration message will be sent. # # Hostname will default to 'tracker.ircache.net' and port will # default default to 3131. If the 'filename' argument is given, # the contents of that file will be included in the announce # message. # #announce_host tracker.ircache.net #announce_port 3131 # HTTPD-ACCELERATOR OPTIONS # ----------------------------------------------------------------------------- # TAG: httpd_accel_host # TAG: httpd_accel_port # If you want to run Squid as an httpd accelerator, define the # host name and port number where the real HTTP server is. # # If you want virtual host support then specify the hostname # as "virtual". # # NOTE: enabling httpd_accel_host disables proxy-caching and # ICP. If you want these features enabled also, then set # the 'httpd_accel_with_proxy' option. # #httpd_accel_host hostname #httpd_accel_port port # TAG: httpd_accel_with_proxy on|off # If you want to use Squid as both a local httpd accelerator # and as a proxy, change this to 'on'. # #httpd_accel_with_proxy off # TAG: httpd_accel_uses_host_header on|off # HTTP/1.1 requests include a Host: header which is basically the # hostname from the URL. Squid can be an accelerator for # different HTTP servers by looking at this header. However, # Squid does NOT check the value of the Host header, so it opens # a big security hole. We recommend that this option remain # disabled unless you are sure of what you are doing. # # However, you will need to enable this option if you run Squid # as a transparent proxy. Otherwise, virtual servers which # require the Host: header will not be properly cached. #httpd_accel_uses_host_header off # MISCELLANEOUS # ----------------------------------------------------------------------------- # TAG: dns_testnames # The DNS tests exit as soon as the first site is successfully looked up # # If you want to disable DNS tests, do not comment out or delete this # list. Instead use the -D command line option # #dns_testnames netscape.com internic.net nlanr.net microsoft.com # TAG: logfile_rotate # Specifies the number of logfile rotations to make when you # type 'squid -k rotate'. The default is 10, which will rotate # with extensions 0 through 9. Setting logfile_rotate to 0 will # disable the rotation, but the logfiles are still closed and # re-opened. This will enable you to rename the logfiles # yourself just before sending the rotate signal. # # Note, the 'squid -k rotate' command normally sends a USR1 # signal to the running squid process. In certain situations # (e.g. on Linux with Async I/O), USR1 is used for other # purposes, so -k rotate uses another signal. It is best to get # in the habit of using 'squid -k rotate' instead of 'kill -USR1 # '. # #logfile_rotate 10 # TAG: append_domain # Appends local domain name to hostnames without any dots in # them. append_domain must begin with a period. # #append_domain .yourdomain.com # TAG: tcp_recv_bufsize (bytes) # Size of receive buffer to set for TCP sockets. Probably just # as easy to change your kernel's default. Set to zero to use # the default buffer size. # #tcp_recv_bufsize 0 bytes # 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. #err_html_text # TAG: deny_info # Usage: deny_info err_page_name acl # Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys # # This can be used to return a ERR_ page for requests which # do not pass the 'http_access' rules. A single ACL will cause # the http_access check to fail. If a 'deny_info' line exists # for that ACL then Squid returns a corresponding error page. # # You may use ERR_ pages that come with Squid or create your own pages # and put them into the configured errors/ directory. # TAG: memory_pools on|off # If set, Squid will keep pools of allocated (but unused) memory # available for future use. If memory is a premium on your # system and you believe your malloc library outperforms Squid # routines, disable this. # #memory_pools on # TAG: memory_pools_limit (bytes) # Used only with memory_pools on: # memory_pools_limit 50 MB # # If set to a non-zero value, Squid will keep at most the specified # limit of allocated (but unused) memory in memory pools. All free() # requests that exceed this limit will be handled by your malloc # library. Squid does not pre-allocate any memory, just safe-keeps # objects that otherwise would be free()d. Thus, it is safe to set # memory_pools_limit to a reasonably high value even if your # configuration will use less memory. # # If not set (default) or set to zero, Squid will keep all memory it # can. That is, there will be no limit on the total amount of memory # used for safe-keeping. # # To disable memory allocation optimization, do not set # memory_pools_limit to 0. Set memory_pools to "off" instead. # # An overhead for maintaining memory pools is not taken into account # when the limit is checked. This overhead is close to four bytes per # object kept. However, pools may actually _save_ memory because of # reduced memory thrashing in your malloc library. # TAG: forwarded_for on|off # If set, Squid will include your system's IP address or name # in the HTTP requests it forwards. By default it looks like # this: # # X-Forwarded-For: 192.1.2.3 # # If you disable this, it will appear as # # X-Forwarded-For: unknown # #forwarded_for on # 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. # #log_icp_queries on # 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, then # it is probably okay to set this to 'on'. # #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. # #minimum_direct_hops 4 # TAG: cachemgr_passwd # Specify passwords for cachemgr operations. # # Usage: cachemgr_passwd password action action ... # # valid actions are: # shutdown * # info # objects # vm_objects # utilization # ipcache # fqdncache # dns # redirector # io # reply_headers # filedescriptors # netdb # server_list # client_list # config * # # * Indicates actions which will not be performed without a # valid password, others can be performed if not listed here. # # To disable an action, set the password to "disable". # To allow performing an action without a password, set the # password to "none". # # Use the keyword "all" to set the same password for all actions. # #cachemgr_passwd secret shutdown #cachemgr_passwd lesssssssecret info stats/objects #cachemgr_passwd disable all # TAG: store_avg_object_size (kbytes) # Average object size, used to estimate number of objects your # cache can hold. See doc/Release-Notes-1.1.txt. The default is # 13 KB. # #store_avg_object_size 13 KB # TAG: store_objects_per_bucket # Target number of objects per bucket in the store hash table. # Lowering this value increases the total number of buckets and # also the storage maintenance rate. The default is 20. # #store_objects_per_bucket 20 # TAG: http_anonymizer # If you want to filter out certain HTTP request headers for # privacy reasons, enable this option. There are three # appropriate settings: # 'off' All HTTP request headers are passed. # 'standard' Specific headers are removed # 'paranoid' Only specific headers are allowed. # To see which headers are allowed or denied, please see the # http-anon.c source file. # #http_anonymizer off # TAG: client_db on|off # If you want to disable collecting per-client statistics, then # turn off client_db here. # #client_db on # TAG: netdb_low # 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. # #netdb_low 900 #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. # #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' then that peer will send ICMP pings to origin server # sites of the URLs it receives. If you enable this option then 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. # #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. # #test_reachability off # TAG: buffered_logs on|off # Some log files (cache.log, useragent.log) are written with # stdio functions, and as such they can be buffered or # unbuffered. By default they will be unbuffered. Buffering them # can speed up the writing slightly (though you are unlikely to # need to worry). #buffered_logs off # TAG: reload_into_ims on|off # When you enable this option, client no-cache or ``reload'' # requests will be changed to If-Modified-Since requests. # Doing this VIOLATES the HTTP standard. Enabling this # feature could make you liable for problems which it # causes. # # see also refresh_pattern for a more selective approach. # #reload_into_ims off # TAG: always_direct # Usage: always_direct allow|deny [!]aclname ... # # Here you can use ACL elements to specify requests which should # ALWAYS be forwarded directly to origin servers. For example, # to always directly forward requests for local servers 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 # # This option replaces some v1.1 options such as local_domain # and local_ip. # 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 # acl all src 0.0.0.0/0.0.0.0 # never_direct deny local-servers # never_direct allow all # # or if squid is inside a firewall and there is local intranet # servers inside the firewall then 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 option replaces some v1.1 options such as inside_firewall # and firewall_ip. # TAG: fake_user_agent # If you use the paranoid http_anonymizer setting, Squid will strip # your User-agent string from the request. Some Web servers will # refuse your request without a User-agent string. Use this to # fake one up. For example: # # fake_user_agent Nutscrape/1.0 (CP/M; 8-bit) # (credit to Paul Southworth pauls@etext.org for this one!) # #fake_user_agent none # TAG: icon_directory # Where the icons are stored. These are normally kept in # /usr/local/squid/etc/icons # TAG: error_directory # If you wish to create your own versions of the default # (English) error files, either to customise them to suit your # language or company copy the template english files to anther # directory and point this tag at them. # TAG: minimum_retry_timeout (seconds) # This specifies the minimum connect timeout, for when the # connect timeout is reduced to compensate for the availability # of multiple IP addresses. # # When a connection to a host is initiated, and that host has # several IP addresses, the default connection timeout is reduced # by dividing it by the number of addresses. So, a site with 15 # addresses would then have a timeout of 8 seconds for each # address attempted. To avoid having the timeout reduced to the # point where even a working host would not have a chance to # respond, this setting is provided. The default, and the # minimum value, is five seconds, and the maximum value is sixty # seconds, or half of connect_timeout, whichever is greater and # less than connect_timeout. # #minimum_retry_timeout 5 seconds # TAG: maximum_single_addr_tries # This sets the maximum number of connection attempts for a # host that only has one address (for multiple-address hosts, # each address is tried once). # # The default value is three tries, the (not recommended) # maximum is 255 tries. A warning message will be generated # if it is set to a value greater than ten. # #maximum_single_addr_tries 3 # TAG: snmp_port # Squid can now serve statistics and status information via SNMP. # By default it listens to port 3401 on the machine. If you don't # wish to use SNMP, set this to '-1'. # # NOTE: SNMP support requires use the --enable-snmp configure # command line option. #snmp_port 3401 # TAG: snmp_do_queueing # If disabled, snmp packets will not be queued but delivered # immediately. This could be useful when you want to monitor a # cache in trouble, but this could also make Squid block, slowing # connections and possibly worsening the cache status. #snmp_do_queueing on # TAG: forward_snmpd_port # This configures whether we should be forwarding SNMP requests # to another snmpd. The reason for putting this piece of # functionality into Squid was to enable access to the system's # installed snmpd with minimal changes. This option is turned # off by default, check with your /etc/services for your system's # snmp port (usually 161). We do not use getservbyname() to # allow you to set Squid into port 161 and your system's snmpd to # another port by changing /etc/services. # # WARNING: Because of Squid acting as a proxy snmpd for system # you have to do security checks on THIS snmpd for all objects. # Check your snmp_config_file. #forward_snmpd_port 0 # TAG: snmp_mib_path # The location of Squid's mib. #snmp_mib_path /usr/local/squid/etc/mib.txt # TAG: trap_sink # Hostname or ip address of trap sink for snmp #trap_sink 127.0.0.1 # TAG: snmp_trap_community # Community name for traps. #snmp_trap_community public # TAG: snmp_enable_authen_traps # Enable SNMP authenticated traps. Set to 'off' or 'on'. #snmp_enable_authen_traps off # TAG: snmp_agent_conf # Define snmp views, users and communities # Example: # snmp_agent_conf view all .1.3.6 included # snmp_agent_conf view squid .1.3.6 included # snmp_agent_conf user squid - all all public # snmp_agent_conf user all all all all squid # snmp_agent_conf community public squid squid # snmp_agent_conf community readwrite all all # TAG: snmp_acl # Define access controls per community: # snmp_access communityname allow|deny [!]aclname ... # Example: # snmp_acl public allow adminsubnet # snmp_acl public deny all # TAG: snmp_incoming_address # TAG: snmp_outgoing_address # Just like 'udp_incoming_address' above, 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 behaviour is to not bind to any specific address. # # NOTE, snmp_incoming_address and snmp_outgoing_address can not have # the same value since they both use port 3130. # #snmp_incoming_address 0.0.0.0 #snmp_outgoing_address 0.0.0.0 # TAG: as_whois_server # WHOIS server to query for AS numbers. NOTE: AS numbers are # queried only when Squid starts up, not for every request. # DELAY POOL PARAMETERS (all require DELAY_POOLS compilation option) # ----------------------------------------------------------------------------- # # A general note on delay pools - the first matched delay pool is used, # that is, if a request falls into class1 then it isn't checked for class2 # or class3 (and similarly a class2 request isn't checked for class3). # TAG: delay_class1_access # This is used to select what client requests are processed via # the first ("class 1") delay pool. In this delay pool only the # aggregate traffic allowance is configurable. # TAG: delay_class2_access # This is used to select what client requests are processed via # the first ("class 2") delay pool. In this delay pool both the # aggregate and per-host traffic allowance are configurable. # There are 254 individual delay pools based on the last 8 bits # of the client IP address (addresses ending in 0 and 255 are not # permitted). # TAG: delay_class3_access # This is used to select what client requests are processed via # the first ("class 3") delay pool. In this delay pool, the # aggregate, network and per-host traffic allowance are # configurable. There are 255 network delay pools based on the # 17th to 24th bit of the client IP address (network 255 is not # permitted), and individual delay pools based on the last 16 # bits of the client IP address (network 255 and hosts ending in # 0 and 255 are not permitted). # TAG: delay_class1_aggregate_restore (bps) # The number of bytes per second added to the class 1 aggregate # delay pool traffic allowance (-1 to disable the delay pool). # TAG: delay_class1_aggregate_max (bytes) # The maximum number of bytes which can be in the class 1 # aggregate delay pool traffic allowance. # TAG: delay_class2_aggregate_restore (bps) # The number of bytes per second added to the class 2 aggregate # delay pool traffic allowance (-1 to disable the delay pool). # TAG: delay_class2_aggregate_max (bytes) # The maximum number of bytes which can be in the class 2 # aggregate delay pool traffic allowance. # TAG: delay_class2_individual_restore (bps) # The number of bytes per second added to the class 2 individual # host delay pool traffic allowances (-1 to disable these delay # pools). # TAG: delay_class2_individual_max (bytes) # The maximum number of bytes which can be in the class 2 # individual host delay pool traffic allowances. # TAG: delay_class3_aggregate_restore (bps) # The number of bytes per second added to the class 3 aggregate # delay pool traffic allowance (-1 to disable the delay pool). # TAG: delay_class3_aggregate_max (bytes) # The maximum number of bytes which can be in the class 3 # aggregate delay pool traffic allowance. # TAG: delay_class3_network_restore (bps) # The number of bytes per second added to the class 3 8-bit # network delay pool traffic allowances (-1 to disable these # delay pools). # TAG: delay_class3_network_max (bytes) # The maximum number of bytes which can be in the class 3 8-bit # network delay pool traffic allowances. # TAG: delay_class3_individual_restore (bps) # The number of bytes per second added to the class 3 individual # host delay pool traffic allowances (-1 to disable these delay # pools). # TAG: delay_class3_individual_max (bytes) # The maximum number of bytes which can be in the class 3 # individual host delay pool traffic allowances. # TAG: incoming_icp_average # TAG: incoming_http_average # TAG: min_icp_poll_cnt # TAG: min_http_poll_cnt # Heavy voodoo here. I can't even beleve you are reading this. # Are you crazy? Don't even think about adjusting these unless # you understand the algorithms in comm_select.c first! # #incoming_icp_average 6 #incoming_http_average 4 #min_icp_poll_cnt 8 #min_http_poll_cnt 8 # TAG: max_open_disk_fds # You can use the inside_firewall directive in squid.conf to specify a list of domains internal to your Internet firewall. inside_firewall deere.com