This following article talks about Network Address Translation (NAT) and port forwarding.
What is port forwarding and what is it used for?
What is the point of port forwarding when NAT seems to do the job fine? All the router needs to know is which computer to direct the packet to, right? Let's say it directs the packet to the appropriate computer and is clueless about the port--won't the target computer know what to do with the packet, with or without the port number? And if you use port forwarding, don't you need to know the target computer anyways?
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