[NTLUG:Discuss] static NAT?

[Bob Byron]

I have a linux server acting as a firewall with a private non-routable 
network (lan) on one side and the internet (wan) on the other.  I have 
a number of ip addresses and want to be able to take one machine on 
the lan and make it addressable from the outside.  I am using IP tables
and the private network is being "NAT"ed.  So, I suspect I have to 
do two things.  

1)  Tell my NIC card on the wan side to accept a second (virtual) 
IP address.

2)  I need to have the firewall stiaticly translate the lan machine using 
that address.  

Any ideas how to do that?

Thanks,
Bob Byron