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1 Configure Version: 2342 Copyright ImageStream Internet Solutions, Inc., All rights Reserved.
2
3 Table of Contents Squid/Configure...1 ImageStream's Default Squid Configuration...1 Transparent Proxy Configuration...1 Running Squid...2 i
4 ii
5 Squid/Configure ImageStream's Default Squid Configuration ImageStream runs Squid in Forward Proxy mode listening on TCP port To use the Squid cache in this default mode configure your Web browser to access the Squid proxy at your router's IP on the default port Simply start squid with the default configuration to use the Forward Proxy mode. Transparent Proxy Configuration Interception Caching goes under many names - Interception Caching, Transparent Proxying and Cache Redirection. Interception Caching is the process by which HTTP connections coming from remote clients are redirected to a cache server, without their knowledge or explicit configuration. To configure squid for Transparent Proxy mode simply add the http_port 3129 transparent directive to your /etc/squid.conf file: Squid/Configure 1
6 Configure lab1:/usr/local/sand# pico /etc/squid.conf Resulting file: include /usr/local/squid/etc/squid.conf http_port 3129 transparent Next you will need to redirect all port 80 (web) and port 21 (ftp) traffic coming from your clients to port Firewall configuration (rc.firewall): # Redirect all Web traffic coming in Ethernet0 to Squid's transparent proxy port 3129 iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j REDIRECT --to-port 3129 # Redirect all FTP traffic coming in Ethernet0 to Squid's transparent FTP proxy (frox) port 2121 iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 21 -j REDIRECT --to-port 2121 ==Bridged Transparent Proxy Configuration Firewall configuration (rc.firewall): # Tell the kernel to process bridged Web packets ebtables -t broute -A BROUTING -p IPv4?ip-protocol 6 \?ip-destination-port 80 -j redirect?redirect-target ACCEPT # Tell the kernel to process bridged FTP packets ebtables -t broute -A BROUTING -p IPv4?ip-protocol 6 \?ip-destination-port 21 -j redirect?redirect-target ACCEPT # Redirect all Web traffic coming in the bridge ports to Squid's transparent proxy port 3129 iptables -t nat -A PREROUTING -i bvi0 -p tcp?dport 80 -j REDIRECT?to-port 3129 iptables -t nat -A PREROUTING -i eth0 -p tcp?dport 80 -j REDIRECT?to-port 3129 iptables -t nat -A PREROUTING -i eth1 -p tcp?dport 80 -j REDIRECT?to-port 3129 # Redirect all FTP traffic coming in the bridge ports to Squid's transparent FTP proxy (frox) port 2121 iptables -t nat -A PREROUTING -p tcp -i bvi0 --dport 21 -j REDIRECT --to-port 2121 iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 21 -j REDIRECT --to-port 2121 iptables -t nat -A PREROUTING -p tcp -i eth1 --dport 21 -j REDIRECT --to-port 2121 Advanced users can override any and all of ImageStream's default settings via the /etc/squid.conf file by placing new directives after the include /usr/local/squid/etc/squid.conf line. Squid default configuration (/usr/local/squid/etc/squid.conf) Running Squid Start squid lab1:/usr/local/sand# Start squid Starting the Squid service...adding user 'nobody' to the password file... Adding user 'nobody' to the shadow file... Mounting add-on program partition read-write... done. Mounting add-on program partition read-only... done. 2 Transparent Proxy Configuration
7 Configure 2009/06/16 14:45:00 Creating Swap Directories 2009/06/16 14:45:00 /usr/local/squid/var/cache exists 2009/06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:00 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:01 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:01 Making directories in /usr/local/squid/var/cache/ /06/16 14:45:02 Making directories in /usr/local/squid/var/cache/0a 2009/06/16 14:45:02 Making directories in /usr/local/squid/var/cache/0b 2009/06/16 14:45:02 Making directories in /usr/local/squid/var/cache/0c 2009/06/16 14:45:02 Making directories in /usr/local/squid/var/cache/0d 2009/06/16 14:45:04 Making directories in /usr/local/squid/var/cache/0e 2009/06/16 14:45:04 Making directories in /usr/local/squid/var/cache/0f done. Started FTP caching server... Running Squid 3
8 Configure 4 Running Squid
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