[ Thanks to Falko
Timme for this link. ]
“This tutorial shows how to set up network-address-translation
(NAT) on a Linux system with iptables rules so that the system can
act as a gateway and provide internet access to multiple hosts on a
local network using a single public IP address. This is achieved by
rewriting the source and/or destination addresses of IP packets as
they pass through the NAT system…”