Start the programme LANconfig and choose your router.
Then choose in the menu: device -> Setup-Assistent and start the assistent for "configurate Dynamic DNS" and after that the provider "DynDNS.org". Now choose the remote station / your external connection.
Register the data for your host in the next window
DNS soluble name: YOUR-NAME.feste-ip.net
Username: HOST-ID (Is shown to you when name is created.)
Password: (Is shown to you when name is created.)
Now the assistent has finished. Press[Weiter] to save the information in your router.
Now open the configuration via the menu of LANconfig: device->configurate.
general: table promotion.
Now look for the entries for your host name.
Click the entry and you can edit it.
Replace members.dyndns.org with members.feste-ip.net and save the configuration in your router.