Port Redirecting

Question :
I want to block port 80 from Lan use to make squid the default. i tried it with the ip tables but it's blocking web access completely that im not able to browse even with squid

Answer:
Ttrasparent proxy thru squid. For this make your squid as a transparent proxy and redirect the request for port # 80 to 3128 like the following rule.

#iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128

This will do.