Adam Jackson wrote:
Hi Squid users, I'm trying to set Squid up to function as a transparent proxy without success. I've got Squid 3 stable release 16. I'm running as root with the cache_effective_user as squid (the owner of the squid directories is squid). I've setup iptables so that port 80 traffic gets sent to 3128 where the client connects iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 Firefox reports that the proxy refused connection. tcpdump indicates that the proxy does receive some packets on 3128 and there are no other obstructive firewall rules. I don't know a great deal about iptables but should I also have a rule that sends requests received on 3128 out of port 80 to the requested web server? The rule above only redirects retrieved pages, if I understand correctly?
There are a minimum of 3 iptables rules for interception... http://wiki.squid-cache.org/ConfigExamples/Intercept/LinuxRedirect
Here is my squid.conf: acl manager proto cache_object acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 #client IP below acl localnet src 10.112.0.221/32 # RFC1918 possible internal network
This being the actual IP of the one and only host you are sending requests from. right?
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 http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access deny to_localhost http_access allow localnet http_access deny all icp_access allow localnet icp_access deny all htcp_access allow localnet htcp_access allow all http_port 3128 transparent hierarchy_stoplist cgi-bin ? access_log /usr/local/squid/var/logs/access.log squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern (cgi-bin|\?) 0 0% 0 refresh_pattern . 0 20% 4320 cache_effective_user squid icp_port 3130 coredump_dir /usr/local/squid/var/cache Thanks.
Amos -- Please be using Current Stable Squid 2.7.STABLE6 or 3.0.STABLE16 Current Beta Squid 3.1.0.8
