iptables virtual interfaces transparent proxy

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http://serverfault.com – Running into an issue with my iptable rule to redirect outbound traffic on port 80 to a squid proxy transparently. Here is my interface information eth0 = internet eth1 = physical interface eth1:0 = eth1:1 = My iptables rule: iptables -t nat -A PREROUTING -s ! -d -p tcp --dport 80 -j DNAT --to-destination squid proxy's socket #bind address http_port Issue, while the squid proxy is pingable from an addresson the network, when I enable the above iptables rule to turn (HowTos)