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Protocol: The protocol item supplies several protocols. For example, if you
have a web server within the LAN, you can select the HTTP template then
the router will input port number 80 automatically.
External Port: Input an extranet port number (the users in Internet can see
these ports).
Internal Port: Input an intranet port number.
4.9.2. DMZ
DMZ opens all the ports of one computer/device to the Internet. It should
only be used for some special purpose as security is negligible in such
situation.
4.9.3. UPNP
Enable Universal Plug’ n’ Play here.