I cannot seem to get my head around this. My ISP very recently put me on CGN/NAT444 which means I should not be able to make customized port forwarding, but to my surprise I can. I tested it with built-in router UPnP protocol and it works.
How is it possible for my ISP to allow me to port forward on a huge NAT of theirs? How incoming connections knows my specific router on the internet in the first place?
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