Draytek VigorIPPBX 3510 User Manual page 116

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 for PPPoE or Static or Dynamic IP mode, you
will find them in Aux. WAN IP for your selection.
VigorIPPBX 3510 Series User's Guide
108