"iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -j SNAT --to $EXTERNAL_IP" Probably because you ignore the -o eth1 on the second line. Thanks, ____________________________________________ George Vieira Systems Manager georgev@xxxxxxxxxxxxxxxxxxxxxx Citadel Computer Systems Pty Ltd http://www.citadelcomputer.com.au Phone : +61 2 9955 2644 HelpDesk: +61 2 9955 2698