pfsync
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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][5]
See also
[edit]References
[edit]- ↑ "/etc/protocols". BSD Cross Reference. OpenBSD.
pfsync 240
- ↑ "/sys/net/if_pfsync.h". BSD Cross Reference. OpenBSD.
- ↑ Federico Biancuzzi (2004-04-15). "OpenBSD PF Developer Interview". ONLamp. O'Reilly Media. Archived from the original on 2004-05-08. Retrieved 2019-03-20.
- ↑ Federico Biancuzzi (2004-05-06). "OpenBSD PF Developer Interview, Part 2". ONLamp. O'Reilly Media. Archived from the original on 2004-06-19. Retrieved 2019-03-20.
- ↑ "State Synchronization (pfsync) Overview | pfSense Documentation". docs.netgate.com. Retrieved 2026-02-16.
External links
[edit]- PF: Firewall Redundancy with CARP and pfsync (OpenBSD PF FAQ)
pfsync(4)man-page in OpenBSD, FreeBSD and NetBSDsys/net/if_pfsync.hin OpenBSDsys/net/if_pfsync.cin OpenBSD
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