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Port forwarding is an excellent way to preserve public IP addresses. That secondary host destination may be a different IP address using the same port, a different port on the same IP address, or a completely different combination of the two. Normally, a network router will examine the header of an IP packet and send it to a linked and appropriate interface, which in turn sends the data to the destination information that’s in the header.īut in port forwarding, the intercepting application (or device) reads the packet header, notes the destination, and then rewrites the header information and sends it to another computer-one that’s different from the one intended. It all starts with the packets that get created when you send a data request over the Internet.
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Of course, even though anyone sending data to a server isn’t aware of what’s going on, the request will still get to its ultimate destination. A program that’s running on the destination computer (host) usually causes the redirection, but sometimes it can also be an intermediate hardware component, such as a router, proxy server or firewall. Port forwarding, or tunneling, is the behind-the-scenes process of intercepting data traffic headed for a computer’s IP/port combination and redirecting it to a different IP and/or port.