DDNS Question (maybe a feature request)

[hdholm]

So my WAN dynamic IP (both IPv4 and 6) don't change very often, but they do change.  And occasionally I'll find that the IP my DDNS provider has is wrong, while the WAN interface and the DDNS service agree that is something different even though the DDNS service is green and nothing in the logs looks "interesting".  The question is, how would you go about diagnosing this?  Deleting the configuration and rebuilding it seems to be overkill, but there also doesn't seem to be a way to force the DDNS service to reach out to the DDNS provider when it thinks the IP is already correct.  So maybe this is a request for a "force an update even if you think it's unneeded" switch.  But I'm open to better ways to diagnose the issue.