Linux system as a router

"Kirkwood, David A." <[email protected]> Tue, 7 Apr 2009 16:13:18 -0400
Newsgroups org.kernel.vger.linux-admin
Message-ID <2E9F9B9B52306D4DB3DEE15E678BDE61011EE61A@0668-ITS-EXMP02.us.saic.com>
How do I set up iptables to make the linux system function as a router?
I think I need to set forwarding between the two interfaces, but I don't
understand the syntax of the command.

Thanks,

David A. Kirkwood