Draytek Vigor 2930 User Manual page 56

The inherent security properties of NAT are somewhat bypassed if you set up DMZ host.
We suggest you to add additional filter rules or a secondary firewall.
Click DMZ Host to open the following page:
If you previously have set up WAN Alias in Internet Access>>PPPoE/PPPoA or Internet
Access>>MPoA, you will find them in Aux. WAN IP list for your selection.
50 Vigor2930 Series User's Guide