SNMP bind needs to list all interfaces/VIPs
The SNMP GUI has a "bind to LAN interface" option but that is a bit ambiguous and not so useful in 2.x. It also doesn't help when trying to contact a CARP VIP over IPsec.
The option needs to be changed to a drop-down that lists all interfaces and CARP/Alias VIPs to allow a more precise bind.
Manually specifying a CARP VIP in the config has been confirmed to work.