Draytek Vigor 5510Gi User Manual page 59

If you previously have set up WAN Alias in Internet Access>>PPPoE, you will find them
in Aux. WAN IP list for your selection.
Enable
Private IP
Choose PC
VigorPro5510 Series User's Guide
Check to enable the DMZ Host function.
Enter the private IP address of the DMZ host, or click Choose PC
to select one.
Click this button and then a window will automatically pop up, as
depicted below. The window consists of a list of private IP
addresses of all hosts in your LAN network. Select one private IP
address in the list to be the DMZ host.
When you have selected one private IP from the above dialog, the
IP address will be shown on the following screen. Click OK to
save the setting.
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