DMZ (Demilitarized Zone)
have a local client PC that cannot run an Internet application
properly from behind the NAT firewall, then you can open the client up to
unrestricted two-way Internet access by defining a Virtual DMZ Host.
PCs can be exposed to the Internet for two-way communications e.g. Internet
gaming, video conferencing, or VPN connections.
To use the DMZ, you must set a static IP address for that PC.