http://tldp.org/HOWTO/Adv-Routing-HOWTO.html
/usr/share/doc/iptables/html/NAT-HOWTO.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO.html

I would concentrate on the Advanced Routing HOWTO.

-- 
Chad Walstrom <chewie at wookimus.net>                 | a.k.a. ^chewie
http://www.wookimus.net/                            | s.k.a. gunnarr
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