Pfsyncd

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The correct title of this article is pfsyncd. The initial letter is shown capitalized due to technical restrictions.

pfsync is a network interface that helps a number of computers running OpenBSD's pf (packet filter) keep their state tables the same. pfsync can send messages indicating changes, or listen for such changes. pfsyncc can be configured using ifconfig. pfsync can be used in conjunction with CARP to make sure a backup firewall has the same information as the main firewall.

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