Draytek Vigor2920 Series User Manual page 117

DMZ Host for WAN2 and WAN3 is slightly different with WAN1. Active True IP selection
is available for WAN1 only.
See the following figure.
If you previously have set up WAN Alias for PPPoE or Static or Dynamic IP mode in
WAN2 interface, you will find them in Aux. WAN IP for your selection.
Available settings are explained as follows:
Item
Enable
Private IP
Description
Check to enable the DMZ Host function.
Enter the private IP address of the DMZ host, or click Choose
PC to select one.
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Vigor2920 Series User's Guide