D-Link DSL-2740B User Manual page 29

Additional configurations available for PPP connection:
PPP Connection
Parameters
Dial on demand
PPP IP extension
Use Static IP Address
Enable PPP Debug Mode
DSL-2740B Wireless ADSL Router User Guide
Description
The Dial on demand function, if checked, will tear down the PPP link
automatically when there is no incoming/outgoing packet via WAN interface
for the programmed period of time that is set below (in minutes). Router
activates PPPoE connection automatically when user wants to access
Internet and there is no active PPPoE connection.
Router passes the obtained IP address to the local PC and acts as a bridge
only modem.
Type in the IP address given by your ISP in this field if your Router's IP
address is not dynamically assigned.
Enable PPP debug mode so you can see the PPP authentication process
from Router Status System Log.
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