Draytek Vigor2133 User Manual page 122

Enable
Private IP
Choose IP
After finishing all the settings here, please click OK to save the configuration.
110
Check to enable the DMZ Host function.
Enter the private IP address of the DMZ host, or click Choose
IP 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 screen. Click OK
to save the setting.
Vigor2133 Series User's Guide