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.

References

↑ "/etc/protocols". BSD Cross Reference. OpenBSD. pfsync 240
↑ "/sys/net/if_pfsync.h". BSD Cross Reference. OpenBSD.

External links

The OpenBSD Project

Operating system	OpenBSD timeline security

Related projects	CARP LibreSSL OpenSSH OpenBGPD OpenIKED OpenOSPFD OpenNTPD OpenSMTPD PF sndio spamd Systrace tmux Xenocara cwm W^X

People	Theo de Raadt Niels Provos OpenBSD Foundation Plaid Tongued Devils

Resources	OpenBSD Journal

The FreeBSD Project

FreeBSD

Subsystems

People

Derivatives

open-source	BSD Router Project DesktopBSD FreeNAS FreeSBIE GhostBSD Kylin MidnightBSD m0n0wall PC-BSD pfSense GNU/kFreeBSD Gentoo/FreeBSD

proprietary	Darwin Junos OS X PlayStation 3 OS PlayStation 4 OS XNU

The NetBSD Project

Operating system	NetBSD

Related projects	pkgsrc IPFilter ATF netpgp tnftp

Notable subsystems	Veriexec busdma PUFFS Rump kernel NPF

Firewall software

Linux

Apps	ipchains Netfilter L7-filter NuFW ipset iptables nftables FireHOL Firestarter Shorewall Uncomplicated Firewall MoBlock Privoxy Squid

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BSD

Apps	PF NPF ipfirewall IPFilter

Distros	M0n0wall SmallWall OPNsense pfSense

OS X

Windows

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Open-source	PeerBlock PeerGuardian

Appliances

Ethernet family of local area network technologies

Speeds	10 Mbit/s 10BASE2 10BASE-T 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 400 Gbit/s and 1 Tbit/s

General	IEEE 802.3 Physical layer Autonegotiation Power over Ethernet EtherType Ethernet Alliance Flow control Frames Jumbos

Historic	CSMA/CD StarLAN 10BROAD36 10BASE-FB 10BASE-FL 10BASE5 100BaseVG LattisNet Long Reach

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Transceivers	MAU GBIC SFP XENPAK XFP SFP+ QSFP CFP

Interfaces	AUI MDI MII GMII XGMII XAUI

All Ethernet-related articles

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pfsync

See also

References

External links