In your previous mail you wrote:

   I'm now considering UDP applications that are sensitive to path MTU
   (toward the destinations). I recalled a discussion about a new socket
   option "IPV6_USEMTU", which allowed an application to specify an
   appropriate path MTU for packets sent from the application. I checked
   the archive of this list in April 2000, and, to my suprise, the
   discussion suddenly disappeared without any consensus.
   
=> today only IPV6_USE_MIN_MTU seems to be defined, implemented and
used (for instance by BIND and racoon, the KAME IKE daemon).
I don't know if IPV6_USEMTU as you define is very useful but the
getsockopt() counterpart (which gives the actual path MTU) *is* useful.
Perhaps the getsockopt() with a standard way to disable fragmentation
is enough (it should be enough for a traceroute_pmtu6)?

Regards

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