Draytek Vigor2912 Series Quick Start Manual page 25

If your router can be under an environment with high speed NAT, the
configuration provide here can help you to deploy and use the router quickly.
The first screen of Quick Start Wizard is entering login password. After
typing the password, please click Next.
On the next page as shown below, please select the WAN interface that you
use. If Ethernet interface is used, please choose WAN1/WAN2; if 3G USB
modem is used, please choose WAN3. Then click Next for next step.
WAN1/WAN2 and WAN3 will bring up different configuration page. Refer
to the following for detailed information.
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Vigor2912 Series Quick Start Guide