There are four schemes for tunneling through firewalls NAT (Network Address Translation), SPI (Service Provider Interface), SOCKS (Sockets) and explicit proxy servers.
I am not too clear on this, but there appear to be several configuring protocols UPnP-NAT(PC (Personal Computer)), NAT-PMP(Mac) and SOHO. And many routers are not configurable.
If you have a server on your LAN (Local Area Network) that provides some protocol, you must configure your firewall to let traffic on the socket ports it use in and out. Further, you must arrange that incoming requests to open a socket are redirected to the appropriate computer on the LAN.
Typically you configure your firewall router using a browser to talk to the fixed IP of the router e.g. http://192.168.0.1/:80, and talk to GUI (Graphic User Interface) in the router’s firmware. You most commonly would specially configure your firewall if you were:
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