OpenBSD CARP and VRRP conflicts
Turns out, the OpenBSD CARP (failover protocol) conflicts in port number, and behavior with devices running VRRP.
We have switch and router equipment which uses VRRP to perform gateway fail over. When we brought in CARP, using the same CARP VHID, and VRRp VRID will cause severe packet loss, as it seems the devices become confused with multicasts broadcasting conflicting member status information.
Avoid using the same CARP VHID, with the same VRRP VRID on the same ethernet segment 
Posted: November 11th, 2009 under Uncategorized.