Steve,
I know that the Sidewinder has that type of failover option as well.
Basically there is a virtual shared IP address. The secondary Sidewinder
keeps monitoring the primary with a heartbeat packet. When the primary
goes down the secondary performs a gratuitous arp for the virtual IP
address. The Cyberguard has something similar as well. I'm pretty sure
this is a common commercial firewall feature. The disadvantage is you
just have failover and not load balancing.
Regards,
Jeffery Gieser
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