Using a Linux Box for a Router with NAT

This is more or less just an example from my box, but here goes:

A box which has this in its /etc/rc.d/rc.local will end up serving as a perfectly valid router for machines connecting to it over eth1, for the subnet.

iptables --flush
iptables --table nat --flush
iptables --delete-chain
iptables --table nat --delete-chain
iptables --table nat --append POSTROUTING --out-interface eth1 -j MASQUERADE
iptables --append FORWARD -j ACCEPT -s
echo 1 > /proc/sys/net/ipv4/ip_forward

-- SeanNewton - 13 Mar 2008

Topic revision: r1 - 2008-03-13 - SeanNewton
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