NAT, how can it be done properly?

I have a question or 2 about NAt and linux.

I'm getting tired of using my big box as a firewall
and my desktop.

so, I am in process of setting up a smaller box to
handle the firewalling and NAT.

problem is, IP_MASQ isn't really a good NAt scheme
(as too many important ports are translated into the 61000
range). I would like to set up a NAT that works like
a true proxy (what is requested for inbound on port
21 <internet> is translated to port 21 on the internal
gateway device and vice versa).

is there a way to do this that isn't complicated?

ipchains makes a good firewall, but as a transparent NAT,
it sucks.

Hawke

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