Gembird NSW-R4 - Manual (Page 28)

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NSW-R4 WIRELESS BROADBAND ROUTER, 300M
Incoming Port Range: The port or port range used by the remote system
when it responds to the outgoing request. A response using one of these
ports will be forwarded to the PC that triggered this rule.
Incoming Protocol: The Protocol used for Incoming Ports Ranges, either
TCP or UDP, or both.
Comment: You can add some comments for this item.
4.2.3 DMZ
If you have a client PC that cannot run Internet applications properly from
behind the NAT firewall or after configuration of the Port Forwarding, then
you can open the client to unrestricted two-way Internet access.
Status: Clicking this box will enable DMZ function.
Host IP Address: Enter the DMZ host IP Address. Note: this may expose
this computer to a variety of security risks.
4.2.4 UPNP
The Universal Plug and Play (UPnP) feature allows the devices, such as
Internet computers, to access the local host resources or devices as needed,