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sounds like what you want to do is transparent proxying... by doing it like this, all tcp port 80 packets going from the lan to the internet will be redirected automatically to the proxy... this way the machines on the lan don't even need to be configured to use a proxy, the proxying becomes transparent to the users on the lan... this is what the iptables rule would look like if eth1 is your lan interface and your proxy is listening on port 3128:
also keep in mind that you'll probably need to configure your privoxy to be able to work transparently... i'm not sure how that works with privoxy, but on squid basically all you need to do is add these lines to your squid.conf:
squid would also need to be compiled using the --enable-linux-netfilter option...
Originally posted by gjhicks but what about the tcp port 80 packets going from the internet to the lan?
there wouldn't be any... the machines on your lan would be establishing a connection to the proxy server... the proxy server would establish a connection to the internet... there wouldn't be any 80/tcp connection between the lan and the internet at any point...