D-Link DI-713P - Manual (Page 26)

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You will need to input the correct values in each of the WAN fields.
Your ISP may have provided each of these values for you. Or, you may
have written them down while you followed the Quick Install Guide. After
you have input all of the correct values, click Save and reboot your
Broadband Router for the changes to take affect.
Dynamic IP Address
The Dynamic IP Address field should be checked if your ISP has not
given you a unique IP address and you receive an automatic IP address
each time you connect to your ISP. The rest of the settings related to your
connection are retrieved automatically each time you connect to the
Internet.
Once you have selected Dynamic IP Address, you will be shown the