Screaming Penguin - Source Does Matter

I havent really messed with iptables yet, I still use ipchains and ipmasqadm. However I have read a few basic tutorials and while they look quite similar the powerful stateful nature of iptables is intribuing (if i get a chance i will take on the task of rebuilding my firewall, for now, if aint broke . . . .)

Anway, there is a quick intro to iptables on Unixreview, not detailed but worth a look, Checkit via the links.   iptables tutorial: unixreview