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I don’t know much about IPv6 but it seems like even if we are stuck with IPv4 we could still make some sort of protocol where my computer could manipulate the NAT table entries allocated to it. Maybe something like DHCP but it deals with ports.

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Isn't something like that what UPnP / zeroconf is supposed to do[1][2]?

[1]: https://en.wikipedia.org/wiki/Universal_Plug_and_Play

[2]: https://en.wikipedia.org/wiki/Zero-configuration_networking

Very interesting. I even found some protocols that exactly implement the functionality I was thinking of!

https://en.wikipedia.org/wiki/Internet_Gateway_Device_Protoc...

https://en.wikipedia.org/wiki/Port_Control_Protocol

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