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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