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Old 31st October 2013
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jggimi jggimi is offline
More noise than signal
Join Date: May 2008
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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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Old 1st November 2013
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jggimi jggimi is offline
More noise than signal
Join Date: May 2008
Location: USA
Posts: 6,513

Second test

File transfer. SUT was a PS3 set top box streaming video from Youtube.


The transition from primary to secondary, then returning to primary, occurred without any affect to the A/V stream or the application.



Eliminate single points of failure. Right now, both routers share the same power strip and share a single ISP. A used UPS just became available from a family member. A backup ISP is available via mobile phone and WiFi tether, though this solution is not automated.
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