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Old 31st October 2013
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
Join Date: May 2008
Location: USA
Posts: 6,218
Default test of application impact with carp(4) failover


External LAN

{cable modem} - Switch - [pair of PC Engines Alix platforms]

Dynamic addressing assignment from ISP, carp(4) unavailable. Active/Standby firewall managed with ifstated(8).

Internal LAN

[Alix boxen] - Switch - [local devices]

Managed by carp(4) and ifstated(8), in Active/Standby configuration (no load balancing).

Private LAN

[Alix box] - [Alix box]

Used by pfsync(4) and dhcpd(8) sync.

System Under Test ("SUT")

My son's Win7 workstation, which was conducting both multiplayer gaming and VoIP on Valve Corporation's Steam network.

Test Methodology

On the primary, issue # ifconfig carp1 down.


The applications on the SUT continued without any errors, timeouts, notifications, delays, or hiccups. My son described it as "seamless".


It's true, pfsync(4) just works. Stateful traffic state was maintained and continued on the Standby firewall/router.


No longer bother to ask my son if he's using the network before conducting firewall maintenance.
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