Setting up a NAT without a firewall

[Paul Hoffman]

Greetings again. Many folks here helped me last year with my travails 
of setting up a FreeBSD 4.8 box as a NAT. I'm trying to reproduce 
that on a different box, and failing. My biggest problem seems to be 
the firewall, which I don't care about. That is, I just want a NAT: I 
don't care about blocking anything incoming or outgoing.

1) Are there directions somewhere for setting up a 4.x box as a NAT 
without needing to do all the firewall stuff?

2) Is this easier in 5.x? I can re-gen the box to 5.1.2 if that would 
be easier.