Need Help in port forwaeding. This is my set up. DSL ROUTER (WAN IP : x.x.x.x | LAN IP 192.168.5.1) | | | Linux Machine (eth0: 192.168.0.2 eth1: 192.168.5.12) | | | Windows machine(eth1: 192.168.5.4)(IIS is running on this machine on port 80) From router i am forwarding the request to linux machine to port 80. any one from out site they are able to see a test pages on linux machine. i want to forward any request coming on port 80 on linux machine to windows machine on port 80. /sbin/iptables -A PREROUTING -t nat -p tcp -s 192.168.5.1 -d 192.168.5.12 --dport 80 -j DNAT --to-destination 192.168.5.4:80 I Use above iptables entry but it is not working. Nitin mandolkar.