firewall howto - iptables

[Johan Ramm-Ericson]

On Sat, 2006-10-28 Noah wrote:
> Date: Sat, 28 Oct 2006 13:56:25 -0700
> From: Noah <admin2 at enabled.com>
> Subject: firewall howto - iptables
> To: Ubuntu Help and User Discussions <ubuntu-users at lists.ubuntu.com>
> Message-ID: <4543C3F9.2030307 at enabled.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> 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

These should get you started:
https://help.ubuntu.com/community/IptablesHowTo
http://www.iptables.org/
http://www.iptables.org/documentation/index.html#documentation-howto

/johan