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09 Feb 09 Linux Squid Transparent Proxy
There are a number of reasons why you might want to use Squid in transparent mode, I won’t go into them – I’ll just explain how!
In Squid versions before 2.6, you’ll want to edit your configuration to specify:
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on
In 2.6 versions and beyond, you can append ‘transparent’ to the end of your http_port option, i.e.:
http_port 192.168.1.1:3128 transparent
Squid will now be ready for transparent proxying. Now create some iptables rules to push all outbound port 80 traffic through squid:
iptables -t nat -A PREROUTING -i eth0 -p tcp –dport 80 -j REDIRECT –to-port 3128
eth0 is the local side of your router, –dport 80 specifies a destination port of 80 (HTTP) and we’re going to redirect it to 3128 where your Squid proxy runs.
Tags: iptables, redirect, squid, transparent proxy
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I'm Adam Palmer, and I'm a Freelance Embedded Linux/Embedded Hardware enthusiast and Security Consultant. I run 'APNIC Solutions Ltd' and spend most of my time managing server clusters, and doing some PHP/MySQL development, whilst what little spare time I have is dedicated to playing with gadgets. I'm always happy to consult on or manage any Linux related, Web Application or Hosting project. Please get in touch with me! |
