Internet Info 1994 March/Internet Info CD-ROM (Walnut Creek) (March 1994).iso/inet/ietf/dfs/dfs-minutes-90may.txt

Text File | 1993-02-17 | 3.2 KB | 94 lines

CURRENT_MEETING_REPORT_



Reported by Peter Honeyman/ University of Michigan

Minutes

At this meeting, attention was focused on NFS. The consensus was that it
will be most useful in the near term to draft a ``survival guide'' for
NFS. The audience for this guide will be vendors and system
administrators.

Suggested recommendations were discussed.  Items that can be addressed
only by implementors are noted.  Some items suggest coordination with
the NOC tools.


   o Avoid packet retransmission
      -  Soft mounts vs.  hard mounts
      -  Adjust timeout parameters to meet local conditions
      -  Transaction ID caching (implementation)
      -  Adaptive retransmission strategy (implementation)
   o Avoid IP fragmentation :  Adjust read and write sizes to meet local
     conditions
   o Ensure reliable data transfer:  Use UDP checksum for long-haul
   o Privacy issues
      -  Reserved socket myth
      -  Mutual distrust among client and server (implementation)
      -  Periodic FSIRAND (NOC tools)
      -  Setuid handling
      -  IP address verification at mount time
      -  IP address verification at access time (implementation)
      -  Root and anonymous mapping
      -  Generalized mapping (implementation)
   o System management
      -  NFSSTAT and NFSWATCH (NOC tools)
      -  SNMP for NFS (implementation)
      -  Export controls
      -  Cache timeout management


Since Ethernet checksum can obviate UDP checksum, a suggestion was made
that UDP checksum be a mount option.  This may not be practical, since
most NFS servers are running on an operating system for which UDP
checksum is either always enabled or always disabled.  The consensus
seems to be that correctness is more important than performance.  I.e.,
UDP checksum should always be enabled.  It was reported that in some
vendors' operating systems, it is impossible to turn on UDP checksum.

There was further discussion of the protocol for Kerberos integration
with NFS.

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ATTENDEES

    David Burdelski           [e-mail]
    Andrew Cherenson          [e-mail]
    Sailesh Chutani           [e-mail]
    Bruce Crabill             [e-mail]
    Peter DiCamillo           [e-mail]
    Craig Everhart            [e-mail]
    Dennis Ferguson           [e-mail]
    Fred Glover               [e-mail]
    Olafur Gudmundson         [e-mail]
    Peter Honeyman            [e-mail]
    Steve Hubert              [e-mail]
    Tim Hunter                thunter@allegum
    Steven Hunter             [e-mail]
    Josh Littlefield          [e-mail]
    Tony Mason                [e-mail]
    Leo McLaughlin            [e-mail]
    Greg Minshall             [e-mail]
    Jeffrey Mogul             [e-mail]
    Dan Nydick                [e-mail]
    Brad Parker               [e-mail]
    Drew Perkins              [e-mail]
    Joel Replogle             [e-mail]
    Bob Sidebotham            [e-mail]
    Ted Soo-Hoo               [e-mail]
    Brad Strand               [e-mail]



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