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Re: ICMP fragmentation required but DF set problems.
From: Felix von Leitner <leitner () VIM ORG>
Date: Thu, 25 Jan 2001 19:51:09 +0100

Thus spake Mark.Andrews () NOMINUM COM (Mark.Andrews () NOMINUM COM):
IPv6 is another case though.  Here you have mandatory PMTU for all
      This is a myth.  It is quite possible to have a IPv6
      implementation that does not require PMTU discovery.  You
      just fragment all your traffic at the network MTU.  If fact
      there are hooks in the BSD advansed API to allow you to do
      this on a per socket basis.

That is a myth, too.
If chose not to to PMTU in IPv6, you have to limit your MTU to ~1200
byts (the exact value is in the RFC).  So it's not the network MTU you
are using.

      DNS servers, for one, need to be able to disable PMTU on
      the replies.



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