[pfSense Support] CARP - failover inconsistencies

[Alastair Stevens]

Title: CARP - failover inconsistencies

Hi - the final question I have with our current setup concerns CARP/failover between our pair of boxes, each of which has 2 WAN and 2 LAN interfaces.

What we're seeing sometimes is that box B will become "master" for the LAN interfaces, but not the WANs, or vice versa.  This obviously breaks things!

For a full failover simulation (ie reboot one of the boxes!) everything works correctly, and all 4 interfaces fail over to the other box, and everything carries on flowing.

But do you know why we are seeing this asymmetric 'flapping' at other times?  I have checked all the settings, and each CARP pair has a unique VHID, and box A is set to a lower advertising frequency.  My understanding is that the 'preempt' flag should cause all interfaces to failover together.

Cheers
Alastair
SysAdmins Ltd
Cambridge, UK