ive included some info below thanks to my linksys router to help give you an idea and better understand what it is your dealing with then we can go from there on what u dont understand.
DMZ
The DMZ Host setting can allow one local PC to be exposed to the Internet. If a local user wishes to use some special-purpose service such as an Internet game or video-conferencing, Enable
DMZ, fill in the IP address, and click the Save Settings button. Select Disable for DMZ, deactivates this feature. When enabling this setting, the Router firewall protection of the local DMZ host will be disabled.
PORTFORWARDING
Port Range Forwarding can be used to set up public services on your network. When users from the Internet make certain requests on your network, the Router can forward those requests to computers equipped to handle the requests. If, for example, you set the port number 80 (HTTP) to be forwarded to IP Address 192.168.1.2, then all HTTP requests from outside users will be forwarded to 192.168.1.2. It is recommended that the computer use static IP address.
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