On Thu, 2 Aug 2018, Joe Touch wrote:
Just because operators/vendors “want” to do otherwise does not make it
possible.
I've been on hotel wifis that are behind 3 layers of NAT, PMTUD
non-working, PMTU is like 1450, and the only thing saving the day is TCP
MSS adjust, so the only thing that works is something over TCP or that
happens to use small enough packets. I have been on other networks where
basically only thing that works is 80/443 and some mail related ports.
Complaining doesn't help, because peoples mobile phones work ok.
It's "possible", because it works well enough for what some people use it
for. Very few complain, so there is no improvement.
So while you're technically and formally right, there is no enforcement
and the only thing we can do is write requirements, tests, educate, but
also educate application and protocol developers on what they might face
in the real world. This is engineering, not physics. Real world is more
important than map.
IP-fragmentation has always been fragile, and it's not improving. The
Internet is growing, so this is not getting better. This is reality, even
though we do not like it.
--
Mikael Abrahamsson email: swm...@swm.pp.se
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