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33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
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# Port Forwarding how to
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You want to open something on your network to the world.
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# What is a port
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A number between 0 - 65,535 that gets assigned to any application that wants
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to communicate over the network. This number is then added to every packet
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that is transmitted by that application. The system knows that any respone
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packets marked by that port number are to be send to that one application.
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This solved the problem on how to make many applications communicate over
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the network simultaneously.
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# How firewall works
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* Firewall allows outgoing communication on any port.
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* But the incoming traffic gets dropped on all ports, unless it is a response
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to communication initialized from the inside.
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So when you visit a website you initialized communication, you send requests
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to some address an web browser is listening for a response at some port.
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# What is port forwarding
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What if you want to host something, lets say a minecraft server.<br>
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You set it all up, you have your IP address known to others and they try to connect,
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but your firewall blocks them. Its a connection initialized from the outside.
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So you need to tell your router/firewall what to do when traffic comes to
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minecraft default port - `25565`. It should be send to some IP address
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on your local LAN where your minecraft server is running.
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