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DMZ
The DMZ, or De-Militarized Zone, is a selected internal IP 
address of a device that allows full access and connectivity 
from  outside  traffic,  through  the  firewall,  to  a  specific 
internal  device  without  being  filtered  or  blocked  by  your 
device.
Select Settings > Firewall > DMZ and the following page 
will appear:
If you select Enable, the DMZ Settings will appear: