When you fetch a web page, for example, it uses port 80. Some ports have specific applications which are standards throughout the computing industry. Once computers became sophisticated to run multiple applications, early computer scientists had to wrestle with the issue of ensuring applications connected to the right applications. Back in the day, when computers could only run one application at a time, all you had to do was point one computer at another computer on the network to connect them as they would be running the same application. So where do ports come into this process? Ports are an old but useful holdover from the early days of network computing. This IP address represents your entire household from the outside world - like a street address, in a way. The cloud icon represents the greater internet and your public, or forward-facing, Internet Protocol (IP) address. How Your Router Handles Requests and Uses Ports Let's look at the details of how it happens. Of course, it isn't just game servers - if it involves internet traffic, ports are involved. Your router uses port forwarding rules to sort out which computer should be sent the traffic relating to the Minecraft server. When they try to connect, their traffic has to be sent to the correct computer on your network, and their connection must be permitted by your router. Say you want to host a Minecraft server for your friends on your computer. Port Forwarding (or port mapping) allows external traffic from the internet to connect to a device, like a computer, on a private network. Fortunately, it's very simple to forward ports on a router if you know where to look What Is Port Forwarding? Although modern Wi-Fi routers handle most functions automatically, some applications will require you to manually forward a port in your router's settings.
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