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Re: The IPv4 Internet MTU

...

For IPv4, an obvious method would be to send packets with DF=0 and hear from the other side how big the fragments are but that's not possible with IPv4.



Yes, that would probably work. The question is how we get a feedback
channel that works.


And that's exactly where I'm suggesting a UDP echo process on its
own port, which has a much better chance of being allowed by firewalls
than ICMP.

   Brian