D-Link DSL-2790U User Manual page 29

Configuration
WAN Service Configuration – PPPoE
Default gateway interface list can have multiple WAN interfaces served as
system default gateways but only one will be used according to the priority with
the first being the higest and the last one the lowest priority if the WAN interface
is connected. Priority order can be changed by removing all and adding them
back in again. Click the Next button to continue.
WAN Service Configuration – PPPoE
elect DNS Server Interface from available WAN interfaces OR enter static
S
DNS server IP addresses for the system. In ATM mode, if only a single PVC
with IPoA or static IPoE protocol is configured, Static DNS server IP addresses
must be entered.
DNS Server Interfaces can have multiple WAN interfaces served as system dns
servers but only one will be used according to the priority with the first being the
higest and the last one the lowest priority if the WAN interface is connected.
Priority order can be changed by removing all and adding them back in again.
Click the Next button to continue