D-Link DI-713P - Manual (Page 28)

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as you would do with a dial-in modem, then you are probably using PPPoE.
If you are simply connected to the Internet when you turn on your
computer, you probably are not. The safest way to check is to call your ISP
or read the documentation provided when you signed up for your Internet
service.
Once you have selected PPP over Ethernet, you will be shown the
following screen.
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