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mtudisc-minutes-90may.txt
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1993-02-17
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CURRENT_MEETING_REPORT_
Reported by Jeffrey Mogul/DEC
AGENDA
1. Report on current draft (Mogul/Deering)
2. Obtain consensus on approach
3. Focus on details
4. Schedule for standardization
MINUTES
This was the third meeting of the MTU Discovery Working Group.
Jeff Mogul started with a review of where we had been in the past 5
months, including all the failed approaches. He then presented the
current proposal, originated by Steve Deering. Summary: send all
packets with the DF bit set. Routers that cannot forward these packets
return a slightly modified ICMP message that indicates the appropriate
MTU. (Current routers return ``0'' in the field meant for this purpose.)
The sending host revises its estimate of the Path MTU, and retransmits
the dropped datagram.
There was no objection to the basic design. Some discussion ensued
concerning details of the implementation and the relation between Path
MTU discovery and transport protocol actions.
This design solves many problems with the previous designs, especially
because it is compatible with existing hosts and routers, and is quite
simple to implement.
ACTION ITEMS
1. Jeff Mogul and Steve Deering will change some details in the
current draft and submit it as an Internet Draft.
2. The Router Requirements working group should be notified that we no
longer care how fragmentation is done, since we don't rely on the
sizes of fragments. We will also recommend that support for MTU
Discovery be made a requirement.
SCHEDULE
We expect never to meet again. Progress towards standardization will go
as fast as possible, unless serious objections are raised.
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ATTENDEES
Fred Bohle fab@saturn.acc.com
Steve Brunigos(?)
David Burdelski daveb@ftp.com
Duane Butler dmb@network.com
Andrew Cherenson arc@sgi.com
Noel Chiappa jnc@PTT.LCS.MIT.EDU
Steve Deering deering@pescadero.stanford.edu
Dave Forster
Rich Fox sytek!rfox@sun.com
Karen Frisa karen@kinetics.com
Steve Hubert hubert@cac.washington.edu
Van Jacobson van@helios.ee.lbl.gov
Stev Knowles stev@ftp.com
Yoni Malachi yoni@cs.stanford.edu
Keith McCloghrie sytek!kzm@hplabs.HP.COM
Leo J. McLauglin III ljm@twg.com
Jeff Mogul mogul@decwrl.dec.com
Drew Perkins ddp@andrew.cmu.edu
John Moy jmoy@proteon.com
Stephanie Price cmcvax!price@hub.ucsb.edu
Mike Reilly reilly@nsl.dec.com
Tim Seaver tas@mcnc.org
Frank Slaughter fgs@shiva.com
Richard Smith smiddy@pluto.dss.com
Brad Strand bstrand@cray.com
Cal Thixton cthixton@next.com
John Veizades veizades@apple.com
Jonathan Wenseur(?) jhw@shiva.com
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