D-Link DI-713P - Manual (Page 30)

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You will need to input the correct values in each of the blank 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. If
you are not sure which settings should be used, please contact your ISP. If
0.0.0.0 is inputted in the Primary and Secondary DNS fields, these values
will be retrieved from your ISP automatically. In the Maximum Idle Time
field, input the maximum time that your connection can be used before
your ISP disconnects you. Select the correct Baud Rate that your modem is
set to. If any extra settings are needed for your external modem to operate
correctly, input the correct values in the Extra Settings field. Refer to your
modem documentation and your ISP to determine if the Extra Settings field
should be used. After you have input all of the correct values, click Save
and reboot your Broadband Router for the changes to take affect.