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Computer firewall protocol

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

pfsync is acomputer protocol^[1]^[2] used to synchronisefirewall states between machines runningPacket Filter (PF) forhigh availability. It is used along withCARP 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 fromthe original on 2004-05-08. Retrieved2019-03-20.
^Federico Biancuzzi (2004-05-06)."OpenBSD PF Developer Interview, Part 2".ONLamp.O'Reilly Media. Archived fromthe original on 2004-06-19. Retrieved2019-03-20.
^"State Synchronization (pfsync) Overview | pfSense Documentation".docs.netgate.com. Retrieved2026-02-16.

External links

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v t e TheOpenBSD Project
Operating system	OpenBSD version history security features
Related projects	bio CARP doas httpd fdm LibreSSL mandoc mg OpenBGPD OpenIKED OpenNTPD OpenOSPFD OpenSMTPD OpenSSH PF pfsync sensors sndio spamd sudo tmux Xenocara cwm
People	Theo de Raadt Niels Provos
Organizations	OpenBSD Foundation
Publications	OpenBSD Journal

TheFreeBSD Project

FreeBSD

Subsystems

Scheduling	ALTQ ULE scheduler
Virtualisation	chroot jail bhyve
Storage	GEOM raid5 GBDE geli LVM2 vinum disklabel fdisk UFS Soft updates VFS ZFS Highly Available STorage
Networking	802.11 drivers ALTQ Bluetooth BPF IPFilter ipfw Netgraph NDIS pf CARP pfsync SCTP
Other	busdma DTrace OpenPAM OpenBSM portsnap kqueue KLD moused systat

People

Derivatives

open-source	Chimera Linux XNU Darwin DesktopBSD DragonFly BSD FreeNAS FreeSBIE GhostBSD MidnightBSD m0n0wall OPNsense pfSense TrueOS GNU/kFreeBSD Gentoo/FreeBSD XigmaNAS
proprietary	Junos macOS,iOS,tvOS, andwatchOS Nintendo Switch OS OpenServer 10 PlayStation 3 OS PlayStation 4 OS PlayStation Vita OS

v t e TheNetBSD Project
Operating system	NetBSD
Related projects	pkgsrc netpgp pcc tnftp tcsh
Notable subsystems	Veriexec busdma DTrace envsys LKM Rump kernel
File systems andstorage	bioctl CHFS disklabel fdisk LVM2 PUFFS tmpfs UFS WAPBL OpenZFS
Firewalls andnetworking	802.11 drivers ALTQ Bluetooth CARP BPF IPFilter NPF PF pfsync

Firewall software

Linux

Apps	FireHOL Firestarter firewalld Netfilter iptables nftables MoBlock Privoxy Shorewall Squid Uncomplicated Firewall
Distros	Endian Firewall IPFire LEAF Project OpenWrt (LEDE) Smoothwall VyOS Zeroshell

BSD

Apps	IPFilter ipfirewall NPF PF pfsync
Distros	OPNsense pfSense

macOS

Windows

Commercial	Check Point Integrity Kaspersky Internet Security McAfee Personal Firewall Plus Norton 360 Symantec Endpoint Protection Trend Micro Internet Security Windows Firewall WinGate WinRoute
Freemium	Comodo Internet Security ZoneAlarm
Open-source	PeerBlock PeerGuardian
discontinued	Microsoft Forefront Threat Management Gateway Norton Internet Security Norton Personal Firewall Outpost Firewall Pro Windows Live OneCare

List of router and firewall distributions

v t e Ethernet family oflocal area network technologies
Speeds	10 Mbit/s 100 Mbit/s 1 Gbit/s 2.5 and 5 Gbit/s 10 Gbit/s 25 and 50 Gbit/s 40 and 100 Gbit/s 200, 400, 800 and 1600 Gbit/s
General	Physical layer Autonegotiation EtherType Flow control Frames Jumbos
Organizations	IEEE 802.3 Ethernet Alliance MEF Forum
Media	Fiber Twisted pair Coaxial First mile 10G-EPON
Historic	CSMA/CD StarLAN 10BROAD36 10BASE-FB 10BASE-FL 10BASE5 10BASE2 MAU FOIRL 100BaseVG LattisNet Long Reach
Applications	Audio Automotive Carrier Data center Energy Efficiency Industrial Metro Power Synchronous
Transceivers	GBIC SFP/SFP+/QSFP/QSFP+/OSFP XENPAK/X2 XFP CFP
Interfaces	AUI EAD MDI MII GMII XGMII XAUI
Category Commons