Firewall Failover with pfsync and CARP
"The two main components provided by OpenBSD are CARP (the Common Address Redundancy Protocol), which allows a backup host to assume the identity of the primary, and pfsync, which ensures that firewall states are synchronised so that the backup can take over exactly where the master left off and no connections will be lost."
(Submitted by Noel Thu Apr 1, 2004 )
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