D-Link DIR-825 - Manual (Page 20)

 D-Lnk DIR-825 User Manual
Secton  - Configuraton
If you selected PPPoE, enter your PPPoE username and password. Click
Next to continue.
Select Static if your ISP assigned you the IP address, subnet mask, gateway,
and DNS server addresses.
Note: Make sure to remove your PPPoE software from your computer. The
software is no longer needed and will not work through a router.
If you selected PPTP, enter your PPTP username and password. Click
Next to continue.
If you selected L2TP, enter your L2TP username and password. Click Next
to continue.