Draytek Vigor2830 Series User Manual page 148

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.
Vigor2830 Series User's Guide
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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