D-Link DSL-2740B User Manual page 80

Section 3 - Configuration
STATIC ROUTE
Enter the destination network address, subnet mask, gateway
AND/OR available WAN interface then click "Apply" to add the
entry to the routing table.
DEFAULT GATEWAY
Select the proper wan interface as the system default gateway
from the drop-down menu. Click "Apply" button to save it.
RIP
To activate RIP service, select the desired RIP version and
operation, followed by placing a check in the 'Enabled' checkbox
for the interface. To stop RIP service, uncheck the 'Enable'
checkbox for the interface. Click the 'Save/Apply' button to save
the configuration and to start or stop RIP.
NOTE: RIP cannot be configured on the WAN interface which has
NAT enabled (such as PPPoE).
D-Link DSL-2740B User Manual 80