Draytek Vigor2920 Series User Manual page 153

Click this button and then a window will automatically pop up,
Choose PC
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.
After finishing all the settings here, please click OK to save the configuration.
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Vigor2920 Series User's Guide