I have noticed that many free or non-free dynamic DNS services have adopted DynDNS protocol for updating the IP address of a host, such as OVH or Hurricane Electric. This allows these services to be compatible with routers supporting DynDNS simply by giving the user a different service host.
The normal DynDNS service host is members.dyndns.org, that’s where the router connects to say the IP has changed.
Unfortunately, the Peplink firmware doesn’t allow the user to change the DynDNS service host. I would love to see this option added as it would immediately add supports for dozens of other services.