[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: The IPv4 Internet MTU
A sender could always cache the most recently discovered PMTU
to a given destination. That would be enough for repeated
short UDP flows to the same destination. As for isolated
short UDP flows, they just need to use the Internet minimum
MTU (576 or 1280) - there's no other possible solution.
Minimum MTU for IPv4 is only 68 bytes; minimum EMTU_R
is the one that is 576 - right?
I forget the exact terminology, but Brian is talking about the
biggest packet one can send and be guaranteed it will not be
fragmented. The is 576 bytes for IPv4 and 1280 bytes for IPv6.
I think of it as the biggest smallest packet one can send :-)