D-Link DI-524UP - Manual (Page 22)

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your ISP.
Primary
DNS Address Input the primary DNS (Domain Name Server) IP address
provided by your ISP
Secondary DNS
Address This is an optional DNS Address entry to be used if the primary
DNS fails.
MTU Enter an MTU value only if required by your ISP. Otherwise,
leave it at the default setting.
Home > WAN > PPPoE
Choose PPPoE (Point to Point Protocol over Ethernet) if your
ISP uses a PPPoE connection. Your ISP will provide you
with a username and password. This option is typically used
for DSL services. Select Dynamic PPPoE to obtain an IP
address automatically for your PPPoE connection. Select
Static PPPoE to use a static IP address for your PPPoE
connection.