OpenBSD developer Ryan McBride has put up a small article, explaining the new firewall redundancy features (pfsync, CARP) in the upcoming OpenBSD 3.5 release. CARP (Common Address Redundancy Protocol) is a free alternative to the patent-encumbered VRRP, responsible for electing masters in a firewall cluster, while pfsync syncronizes packet filter state information among nodes.
OpenBSD - Firewall Failover With pfsync And CARP
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