4G680V2.0 
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When some hosts inside the private network have already allocated the local IP address, that is, only 
the private address used in the private network, but now they want to communicate with the host on 
the Internet (no need to encrypt), we can use the NAT method. 
 
3.8.3 DMZ 
Receive all the data from external network interface forwarded to “DMZ IP address” 
Enable DMZ: If an application has trouble working from behind the router, you can expose one 
computer to the Internet and run the application on that computer. 
Note: Placing 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. 
DMZ  Address:  Specify  the  IP  address  of  the  computer  on  the  LAN  that  you  want  to  have 
unrestricted Internet communication.