firewall howto - iptables

[Noah]

Hi there.

My ubuntu server is acting as my NAT box between my upstream provider 
and my internal network.

I am looking for a nice example of iptables rules that I can put in 
place to add a decent amount of filtering for my server and my internal 
network.

Might somebody have a good example script they can send me or a HOWTO 
web link?

thanks in advance,

Noah

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