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>>>>> "smb" == Steven M Bellovin <smb@research.att.com> writes:

   smb> Path MTU is difficult for protocols that aren't
   smb> connection-oriented.

Why?

I thought the discovered MTU was stored in a /32 or /128 host route,
not in any TCP connection structure.  

And I just posted a link where Cisco details the path MTU discovery in
their gre and IPsec tunnels, which are, like UDP, stateless aside from
the endpoints' IP addresses (and, for IPsec, a UDP-port-number-like
SPI).

-- 
The auditing that is conducted on slot machine software in the U.S. is
significantly more meticulous than what is done to voting software.
		-- Bruce Schneier

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