Redundant netfilter gateway

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I am looking for info on creating a redundant gateway/firewall. I
currently have my network setup with 1 working iptables gateway/firewall
and 1 backup gateway. If the first gateway goes down, I change the IP's
and spoof the MAC addresses (I change the external MAC address because
my internal network is masqueraded through the gateway and just
switching the external IP messes with the arp tables on the router...
That's a whole other issue though) on the backup gateway and it takes
over. This is not redundancy and is dirty. Does anyone have any
suggestions on how to do this better?

Patrick Ahler
Systems Administrator
Vikus Corporation 



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