What is Port Forwarding
The term Port Forwarding refers to the process of transferring a network hole from one machine to another. This process is most commonly used when the receiving machine is behind the network router. By doing this, it allows users outside the LAN (local area network) to access the private user on the LAN itself. Every machine on the Internet now has at least one IP address used to identify that machine or device. The entire IP address is divided into multiple ports. The ports are there for the machines to communicate with each other, for example (computer A sends some data to computer B), so moving the port will also improve the transmission speed between the two machines.
Now let's look at how machines are connected to the internet when they are behind the router. The router is first connected to the Internet which we will call the external IP. The router will now have its own internal IP address. (every device / device will have at least one IP to identify itself). The router will then supply each IP address to every device connected to the router. The router's IP address will then serve as the gateway for all devices on its network. If a machine on the network wants to send data to another machine online, you will first have to go through the gate before the router sends it to the recipient. The recipient however will not be able to tell who in the network you are sending the data to as the Internet will only show an external IP address here. Similarly, when another offline device sends data to an offline receiver, the data transfer will be transferred to the external IP address and not directly to the intended recipient. The router will then determine which recipient should receive the data transmitted. Fortunately, NAT routers will take care of most of the redirects apart from those programs that NAT is not designed to work with. This is where the transfer of the hole takes place. This simple process is simply a way for users to tell the router which machine on the local network is intended for the recipient and that the data should be directed to him or her. You will need to set the hole transfer rules for every hole you use and any rules set for a specific hole will only apply to that particular hole.
One important thing to note is that the port can only be used by the system at any time. For example, if computer A uses 6000 holes, it uses 6000 holes for its internal IP address. If you have set up a computer routing port A and a 6000 port, 6000 external IP address port also works. This means you can only use port 6000 on one computer in a network at a time. Using port 6000 on two computers at once will break the rules of one program, and your data will be corrupted.
- Port forwarding is a networking method in which a gateway or similar device forwards all incoming communication/traffic to the same port on any internal network node. An external source network or system can link to an internal source node/port, which commonly connects to Internet services and a private LAN.
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