Hi, Fred, > On Dec 7, 2021, at 5:38 PM, Templin (US), Fred L <fred.l.temp...@boeing.com> > wrote: > ... > This conversation is missing some fundamental points – really the most > important > points – which are the minimum sizes guaranteed to work everywhere. For IPv6, > the minimum MTU/MRU are 1280/1500.
They work only because of source fragmentation at IP tunnels, e.g. > For IPv4, they are only 68/576 but since > the IPv4 network supports fragmentation we can nominally designate the IPv4 > minimum MTU as 576 also if we clear the DF bit. But then those packets will fail through NATs. > It means that, without probing > or having some divine knowledge of paths that have not been previously > visited, > the ONLY sizes guaranteed to work are 1280 for IPv6 and 576 for IPv4. That’s the problem - they don’t. If they did, we wouldn’t be having this conversation ;-) Joe
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