[e2e] Protocols breaking the end-to-end argument

[Jeroen Massar]

Jaime Mateos wrote:
> Hi,
> I'm working on a project about the current challenges the Internet is
> presenting to the end-to-end argument. I'd be interested to know about
> any protocols, currently in use, that break the end-to-end principle and
> the context where they are used.

Everything that needs an NAT helper, thus any protocol that embeds
addresses or ports, thus most games, everything that has a listening
port where the listening port is not on a public IP or firewalled away.

Greets,
 Jeroen

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