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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.

See also[edit]


  1. ^ "/etc/protocols". BSD Cross Reference. OpenBSD. pfsync 240 
  2. ^ "/sys/net/if_pfsync.h". BSD Cross Reference. OpenBSD. 

External links[edit]