pfSense

Using 2.5.2-RELEASE

I have two interfaces - One WAN (gigabit) and a 4G Data Cell Link (150Mbps) as a secondary.
The WAN is Tier 1 and 4G is Tier 2 in a Gateway Group for failover.

If WAN 1 is unplugged, the 4G failover works no problem, however DynamicDNS fails to work - reporting that there is no response from NoIP (dyndns URL) - and the DNS record is not updated.
The same Dynamic update works if the WAN connection is reconnected. The default routing path is set to the Routing Group (and also tested with Automatic - but no effect).

If however the CUSTOM Dynamic DNS option is selected, you get an extra box for "Which Interface to send update from" - which I select the Routing Group - after adding the manual update URL string for NoIP, the updating on failover works perfectly.

It appears that all the standard Dynamic DNS providers are not updating/obeying the routing setup (so possibly using the standard WAN as the only interface).

Any suggestions welcome - happy to put up a config or activity log as this is in a non-production environment.