Topfield Digital Terrestrial Receiver PERSONAL VIDEO RECORDER TF 600 PVRt - Manual (Page 71)

8.1 Configuring the router 65
1. Make an account on a web site providing DDNS service,
which should be supported by your router.
2. Configure your router with the account so that it can
communicate with the web site.
Whenever a new dynamic IP address is assigned to the router,
it will inform the DDNS service provider of the new IP address.
This makes it possible that you access the router with a domain
name at any time.