google path mtu?

[Matthew Luckie]

> It struck me that this should be possible to test on an
> host. Basically if the host can just respond to a packet with PTB,
> then checking if the size of the packets received changes or not
> would be interesting. Is anyone aware of someone implementing this
> already?

Yes, the tbit tool does this.

http://icir.org/tbit/

We have implemented parts of tbit in scamper, and in particular
modified the PMTUD test algorithm, and to add IPv6 support.  The main
limitation is that it requires IPFW (i.e. freebsd, or an older version
of MacOS X)

http://www.caida.org/~mjl/pubs/measuring-pmtud.pdf
http://www.caida.org/tools/measurement/scamper/

An example test from the past:

http://lists.cluenet.de/pipermail/ipv6-ops/2013-August/009213.html

Matthew
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