MTU discovery changes
Status from this message: Applied, thanks.
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Cover letter [PATCH 0/2] [iputils] MTU discovery changes
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