Software:Pfsync: Difference between revisions

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{{Short description|Computer firewall protocol}}
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'''pfsync''' is a computer protocol<ref>{{cite web |url=http://bxr.su/o/etc/protocols |title=/etc/protocols |publisher=[[Organization:OpenBSD|OpenBSD]] |website=BSD Cross Reference |quote="pfsync  240"}}</ref><ref>{{cite web |url=http://bxr.su/o/sys/net/if_pfsync.h |title=/sys/net/if_pfsync.h |publisher=[[Organization:OpenBSD|OpenBSD]] |website=BSD Cross Reference}}</ref> used to synchronise firewall states between machines running [[Software:PF (firewall)|Packet Filter (PF)]] for [[High availability|high availability]]. It is used along with [[Common Address Redundancy Protocol|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.<ref name=onlamp-35-1>{{cite web
'''pfsync''' is a computer protocol<ref>{{cite web |url=http://bxr.su/o/etc/protocols |title=/etc/protocols |publisher=[[Software:OpenBSD|OpenBSD]] |website=BSD Cross Reference |quote="pfsync  240"}}</ref><ref>{{cite web |url=http://bxr.su/o/sys/net/if_pfsync.h |title=/sys/net/if_pfsync.h |publisher=[[Software:OpenBSD|OpenBSD]] |website=BSD Cross Reference}}</ref> used to synchronise firewall states between machines running [[Software:PF (firewall)|Packet Filter (PF)]] for [[High availability|high availability]]. It is used along with [[Common Address Redundancy Protocol|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.<ref name=onlamp-35-1>{{cite web
|url= http://www.onlamp.com/lpt/a/4767
|url= http://www.onlamp.com/lpt/a/4767
|title=  OpenBSD PF Developer Interview
|title=  OpenBSD PF Developer Interview
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|access-date=2019-03-20
|access-date=2019-03-20
|archive-date= 2004-06-19
|archive-date= 2004-06-19
}}</ref>
}}</ref><ref>{{Cite web |title=State Synchronization (pfsync) Overview {{!}} pfSense Documentation |url=https://docs.netgate.com/pfsense/en/latest/highavailability/pfsync.html |access-date=2026-02-16 |website=docs.netgate.com}}</ref>


== See also ==
== See also ==
* [[Organization:OpenBSD|OpenBSD]]
* [[Software:OpenBSD|OpenBSD]]
* [[Software:PF (firewall)|PF (firewall)]]
* [[Software:PF (firewall)|PF (firewall)]]
* [[Common Address Redundancy Protocol|CARP]]
* [[Common Address Redundancy Protocol|CARP]]

Latest revision as of 04:58, 11 April 2026

Pfsync

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

References

  1. ↑ "/etc/protocols". OpenBSD. http://bxr.su/o/etc/protocols. ""pfsync 240"" 
  2. ↑ "/sys/net/if_pfsync.h". OpenBSD. http://bxr.su/o/sys/net/if_pfsync.h. 
  3. ↑ Federico Biancuzzi (2004-04-15). "OpenBSD PF Developer Interview". O'Reilly Media. http://www.onlamp.com/lpt/a/4767. 
  4. ↑ Federico Biancuzzi (2004-05-06). "OpenBSD PF Developer Interview, Part 2". O'Reilly Media. http://www.onlamp.com/lpt/a/4839. 
  5. ↑ "State Synchronization (pfsync) Overview | pfSense Documentation". https://docs.netgate.com/pfsense/en/latest/highavailability/pfsync.html. 




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