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Eth0 is 1/WAN port on the back of the device. It is to function as a WAN port here. After you finish your settings, click 
  and then refer to To Set up WAN Service for ETH Interface to configure the WAN service for Internet 
access. 
4.2.2 WAN Service 
This router provides two WAN services: 
- WAN Service for ATM Interface (ADSL uplink) 
- WAN Service for ETH Interface (Ethernet uplink) 
To Set up WAN Service for ATM Interface 
  EoA (PPPoE, IPoE and Bridge) 
If you configured the ATM Interface (ADSL uplink) and select EoA as the DSL link type, follow below steps to 
configure the WAN service: