Tenda AC1200 User Manual page 74

Here you can view your configurations. When the PPPoE connection is successful, you can access the Internet.
 Steps 1~6 above for PPPoE and IPv4&IPv6 (Dual Stack) users
3) PPPoE IPv6 Only Users
If you configure the ETH Interface (Ethernet uplink) and select eth0/eth0 as the ETH WAN interface, then you can start
to set up WAN service for accessing the Internet.

Click Advanced Setup > WAN Service and then click the Add button.

Select the ETH interface you added just now from the pull-down menu in the figure below. Click Next.
Wireless AC1200 ADSL2+ Dual Band Modem Router
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