Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 37)

ADSL2/2+ Router
- 37 -
2. In Ethernet modes, you are required to configure parameters for
Ethernet interface.
To enter the ETH Interface page, click “Advanced Setup”---“Connection
Mode” (Select Ethernet mode and click “Apply”) --- “WAN Service”---
“ETH Interface”. And then click the “Add” button to configure relevant
parameters.
The Ethernet interface configured on this page is used as a WAN port.
You can select only one LAN interface to function as a WAN port. Once
you finish, click the “Apply/Save” button.