Draytek Vigor2120 series User Manual page 169

If you previously have set up WAN Alias for PPPoE or Static or Dynamic IP mode in WAN
interface, you will find them in Aux. WAN IP for your selection.
Available settings are explained as follows:
Item
Enable
Private IP
Choose PC
After finishing all the settings here, please click OK to save the configuration.
Description
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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Vigor2120 Series User's Guide