These add some changes that make tracepath a little more useful for
diagnosing MTU issues. The length flag helps distinguish between MTU
black holes and other types of black holes by allowing you to vary the
probe packet lengths. Using PMTUDISC_PROBE gives you the same results
on each run without having to flush the route cache, so you can see
where MTU changes in the path actually occur.
The PMTUDISC_PROBE patch goes in should be conditional on whether the
corresponding kernel patch (just sent) goes in.
-John
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