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pfsync is a computer protocol[1][2] used to synchronise firewall states between machines running Packet Filter (PF) for high availability. It is used along with CARP to make sure a backup firewall has the same information as the main firewall. When the main machine in the firewall cluster dies, the backup machine is able to accept current connections without loss.[3][4]

See also[edit]


  1. ^ "/etc/protocols". BSD Cross Reference. OpenBSD. pfsync 240
  2. ^ "/sys/net/if_pfsync.h". BSD Cross Reference. OpenBSD.
  3. ^ Federico Biancuzzi (2004-04-15). "OpenBSD PF Developer Interview". ONLamp. O'Reilly Media. Retrieved 2019-03-20.
  4. ^ Federico Biancuzzi (2004-05-06). "OpenBSD PF Developer Interview, Part 2". ONLamp. O'Reilly Media. Retrieved 2019-03-20.

External links[edit]