D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - Manual (Page 28)

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Dynamic DNS
Dynamic DNS is a service for allowing an Internet domain name to be assigned to a
varying IP address. This makes it possible for other sites on the Internet to establish
connections to you without needing to track the IP address themselves. Click on
Add to set up a dynamic DNS configuration.
Note that the Add and Remove buttons will only show up if you have established a
WAN connection(s) (not including bridge connection).
This screen allows you to add a dynamic DNS address from DynDNS.org or TZO.
First select the D-DNS provider—DynDNS.org or TZO—from which you have obtained
a dynamic DNS address. Enter the hostname and the interface that you are using.
Also enter the username and password assigned by the DNS service. Click on Apply
to save these configurations.