Pfsync

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Pfsync
Repository	bxr.su/o/sys/net/if_pfsync.c

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]

References

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^ "/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

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📚 Artikel Terkait di Wikipedia

Common Address Redundancy Protocol

regulating[sic] "official" internet protocol numbers, to give us numbers for CARP and pfsync, our request was denied. Apparently we had failed to go through an official

OpenBSD

stateful firewall with NAT, PAT, QoS and traffic normalization support pfsync, a firewall state synchronization protocol for PF with high availability

NetBSD

bioctl CHFS disklabel fdisk LVM2 PUFFS tmpfs UFS WAPBL OpenZFS Firewalls and networking 802.11 drivers ALTQ Bluetooth CARP BPF IPFilter NPF PF pfsync

PF (firewall)

quality of service (QoS) have been integrated into PF. Features such as pfsync and CARP for failover and redundancy, authpf for session authentication

Bioctl

LibreSSL mandoc OpenBGPD OpenIKED OpenNTPD OpenOSPFD OpenSMTPD OpenSSH PF pfsync sensors sndio spamd sudo tmux Xenocara cwm People Theo de Raadt Niels Provos

OpenBSD security features

countermeasures for problems with ICMP and software for redundancy, such as CARP and pfsync, are also included. The project was the first to disable the plain-text