Re: Syncing iptables rules between two servers

I am not sure if this is exactly what you want: It is an extention to iptables to allow syncing of rules and state tables (if you use it statefull) for HA firewalls.
I haven't tested it.

Unfortunately the article is on German. Maybe there is an English translation in the US version of the magazin or you get it translated somehow.

http://www.linux-magazin.de/Artikel/ausgabe/2005/12/linux-ha-fw/linux-ha-fw.html