D-Link DSL-2790U User Manual page 70

Configuration
for example you are running a public web server or VPN server on your LAN,
this ensures that the host can be located from the Internet if the public IP address
changes. DDNS requires that an account be setup with one of the supported
DDNS providers.
Click Add to see the Add DDNS Settings section.
Enter the required DDNS information, click the Apply / Save button to save the
information.
DDNS requires that an account be setup with one of the supported
DDNS servers prior to engaging it on the Router. This function will
Note not work without an accepted account with a DDNS server.
To access the DSL Settings window, click the DSL button in the Advanced Setup directory.
DSL