On 06/28/2013 09:20 PM, Brian E Carpenter wrote:
On one point...
On 29/06/2013 10:44, Templin, Fred L wrote:
...
and (b) accepting that strapping the MTU at 1280 is
a reasonable short term policy. If (a) progressively pervades
the installed base then (b) can be dropped as the years go by.
Once a link sets a 1280 MTU, how will it know that it is now
safe to increase the MTU? And, once set, how can we expect
operators to go back and re-set in the future. IMHO, strapping
the MTU to 1280 everywhere now would become ossified long into
the future.
It would certainly take years, but I think the end result would be
implementors raising the default to the real link MTU, one stack
at a time. I don't think you find many IPv4 stacks today with
the MTU set low by default.
I think an argument can be made that in today's world 1500 MTU (which is
the fairly ubiquitous default) IS actually low.
Doug
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