Redundant firewall

Linux Advanced Routing and Traffic Control

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Hi,

I hope this is not OT. I searched through the archives but didn't find anything really answering my question.

I want to create a cluster of two firewalls with Linux-HA so that if the primary fail, the secondary firewall will take over. Note that I don't care about syncing states between firewalls, they will just have to reconnect :)

It's a typical configuration:

                   _______FW1_______
                  /        |        \
INTERNET--ROUTER--<         |HB       >--SERVER
                  \_______ | _______/
                          FW2

HB is the heartbeat between the two firewalls.

The default gateway of SERVER will be the IP address of the cluster of firewall. So SERVER->INTERNET will always go through the right FW.

But I'm concerned about INTERNET->SERVER (public IP).

My question is: will enabling proxy_arp on the active firewall and disabling it on the inactive be enough to route the traffic through the correct(active) firewall?

Thanks

Sébastien
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