The DMZ (Demilitarized Zone) option provides you with an option
to set a single computer on your network outside of the router. If
you have a computer that cannot run Internet applications
successfully from behind the router, then you can place the computer
into the DMZ for unrestricted Internet access.
Note: Putting a computer in the DMZ may expose that
computer to a variety of security risks. Use of this option is only
recommended as a last resort.