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i our case the default gateway and the wan ip (virtual or not) are in the same subnet.
One way I found to trigger the loss on the backup is to  play with both buttons to disable CARP.
I have to do that every time it goes from MASTER->BACKUP as it is the only way I found to make it stop using the the virtual WAN ip to communicate with the outside world.

hi is there particular reason as to why update-conflict-detection is set (hard coded) to false?

disabling it disables among other things: ddns-guard-id-must-match

this is what the man page says :
The ddns-guard-id-must-match statement

           ddns-guard-id-must-match flag;

           The ddns-guard-id-must-match parameter controls whether or not a
           the client id within a DHCID RR must match that of the DNS update's
           client to permit DNS entries associated with that DHCID RR to be
           ovewritten.  Proper conflict resolution requires ID matching and
           should only be disabled after careful consideration.  When
           disabled, it is allows any DNS updater to replace DNS entries that
           have an associated DHCID RR, regardless of client identity. This
           parameter is on by default, has no effect unless update-conflict-
           detection is enabled, and may only be specified at the global
           scope.

if I'm (am I?) reading it correctly this will enable any client to rewrite A record it wishes to  (if DDNS is enabled).