38D-Link DSL-2790U Wireless N300 ADSL2+ Modem Router User Manual
Section 4 - Conguration
Connection: Select either Always-on, On-Demand and set the idle time, or 
Connect Manually. Mobile data charges may apply.
PPP 
Authentication:
Select a proper authentication method in the drop-down list. You can 
select Auto, PAP, or CHAP.
Default Route: Select to use the Default Route.
NAT Enable: Check this to enable the router to use NAT to assign IP addresses 
for your devices.
MTU: If you experience connection issues, you may need to change the 
MTU setting for optimal performance with your specific ISP. 1492 is 
the default MTU.
CONNECTION SETTINGS
Click Save/Apply when you are done.