i m running redhat linux enterprize edition and i configured squid and internet was running on client's PC.
but when i was going to configure the transparents squid then it causes problem and now internet is not running on client's PC.

i also want to know, what i did wronge that causes that now internet is not running.
now i want to tell my scenario
i have two PCs one on which squid server is running and second is the client's PC.
i ve two thernet cards eth0 (internet provider connection) and eth1( attacjhed to the client's PC). To make the squid server as transparent i run this command

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

.iptables-t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128

unfortunately i run above command on both interfaces and now internet is not running. what is wronge in that.

run it only for eth1 (your LAN interface). redirecting port 80 on eth0 (your internet link) blocks http requests from your gateway.