The only documentation I can find about configuring this is the somewhat cryptic little note at the bottom of the page:
You must configure a DNS server in System: General setup or allow the DNS server list to be overridden by DHCP/PPP on WAN for dynamic DNS updates to work.
Presumably, that means that whatever DNS is listed on the General setup is the machine to which the update is sent?
What triggers an update push? Rebooting doesn't seem to cause it to happen. The A record pulled from the listed name server being wrong doesn't seem to trigger it. Does the actual assigned IP have to change?
If anyone is actively maintaining the feature how about an "update now" button? (If no one is maintaining where do I read/sign up?)
Thanks for your time.