Try bastille-firewall. This will setup NAT as well as a good firewall
for you.
apt-get install bastille
/usr/sbin/InteractiveBastille
Answer the questions. If you are not sure, accept defaults.
The main thing you want to be careful about is the 'trusted' interfaces
and selecting which ports you want to keep open. If you are only using
this box as a NAT, keep all ports closed.
Works like a charm.
Good luck.
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