D-Link DSL-2880AL User Manual page 24

Section 3 - Configuration
For PPPoE/PPPoA INTERNET CONNECTION TYPE:
Type in the Username and Password (and PPPoE Service Name, if
required by your ISP).
Choose PPPoE LLC/Snap-Bridging, PPPoE VC-mux, PPPoA
LLC/encapsulation and PPPoA VC-mux in drop-down menu.
You can use Static IPv4 Address check box and type Static IP.
Set MTU value which you want but should be less than 1492.
PPP IP Extension: Router passes the obtained IP address to the local
PC and acts as a bridge only modem.
DNS AND DEFAULT GATEWAY
Select Obtain DNS server address automatically to get DNS from
your ISP.
Or Select Use the following DNS server addresses to specify the
DNS server IPs in the Preferred DNS server and Alternate DNS
server.
D-Link DSL-2880AL User Manual 24