On 04/14/2014 01:33 PM, Gareth France wrote:
ping -M do -s 1400 google.com
Reducing to 1400 worked but if I wait until the pages stop loading I get
this:
ping: unknown host google.com
The optimum MTU setting will be a multiple of 4 lower than 1500. The way
to find the optimum setting is to lower it until you don't get
fragmentation then increase it until the last value before fragmentation
sets in. This is ideally suited to a binary chop style search, so try
increasing the test from 1400 to 1464, then either up or down by half as
much (32) depending on whether that re-introduces fragmentation or not,
then repeatedly up/down half as much again (16, 8, 4) until you have
reached increments/decrements of 4. You're guaranteed to reach the
optimum MTU in a handful of searches.
--
JimP
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