Multi-WAN support for RFC 2136 Dynamic DNS
RFC 2136 Dynamic DNS lacked support for Multi-WAN so it could not be used for failover scenarios. Even though it's superior to traditional HTTP style DynDNS, it made the feature less attractive. The page needs the ability to select a gateway group for the Interface, and the backend code needs to account for the differences with that style as well.
Support for Multi-WAN and RFC 2136 was added in c7127a130022e92c1f762c35fdb85df723757384 -- adding this ticket for tracking. It has been tested in several configurations and works well.