Gateway special interest group meeting notes
RFC 898

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Network Working Group                                    R. Hinden (BBN)
Request for Comments: 898                                J. Postel (ISI)
                                                          M. Muuss (BRL)
                                                       J. Reynolds (ISI)
                                                              April 1984

              GATEWAY SPECIAL INTEREST GROUP MEETING NOTES

STATUS OF THIS MEMO

   This memo is a report on a meeting.  No conclusions, decisions, or
   policy statements are documented in this note.

INTRODUCTION

   This memo is a report on the Gateway Special Interest Group Meeting
   that was held at ISI in Marina del Rey, California on 28 and 29
   February 1984.  Robert Hinden of BBNCC chaired, and Jon Postel of ISI
   hosted the conference.  Approximately 35 gateway designers and
   implementors attended.  These notes are based on the recollections of
   Jon Postel and Mike Muuss.  Under each topic area are Jon Postel's
   brief notes, and additional details from Mike Muuss.

   The rest of this memo has three sections: the agenda, notes on the
   talks, and the attendees list.

MEETING AGENDA

   Tuesday, February 28

      9:00  Opening Remarks -- BBN - Hinden
      9:15  Opening Remarks -- ISI - Postel
      9:30  The MIT C Gateway -- MIT - Martin
      10:00 The Butterfly Gateway -- BBN - Hinden
      10:30 Break
      11:00 The EGP C Gateway -- ISI - Kirton
      11:20 The BRL Gateway -- BRL - Natalie
      11:40 The CMU Gateway -- CMU - Accetta
      12:00 Lunch
      1:30  The Wisconsin BITNET/CSNET Gateway -- UWisc - Solomon
      2:00  LAN to X.25 Gateway -- Computer Gateways Inc. - Buhr
      2:20  ISI-UCI Gateway -- UCI - Rose
      2:40  FACC Gateway -- FACC - Holkenbrink
      3:00  Break
      3:30  Lincoln IP/ST Gateway -- LL - Forgie/Kantrowitz
      3:50  Minimal Stub Gateways -- MITRE - Nabielsky
      4:10  Discussion

Hinden, Postel, Muuss, & Reynolds                               [Page 1]



RFC 898                                                       April 1984
Gateway SIG Meeting Notes

   Wednesday, February 29

      9:00  Opening Remarks -- BBN - Hinden
      9:10  SPF routing -- BBN - Seamonson
      9:35  Multiple Constraint Routing -- SRI - Shacham
      10:00 FACC Multinet Gateway Routing -- FACC - Cook
      10:30 Break
      11:00 Metanet Gateway -- SRI - Denny
      11:20 Address Mapping and Translation -- UCL - Crowcroft
      11:40 Design of the FACC Multinet Gateway -- FACC - Cook
      12:00 Lunch
      1:30  SAC Gateway -- SRI - Su/Lewis
      2:00  EGP -- Linkabit - Mills
      2:30  Congestion Control -- FACC - Nagle
      3:00  Break
      3:30  A Gateway Congestion Control Policy--NW Systems - Niznik
      4:00  Discussion

NOTES ON THE MEETING

   The MIT C Gateway -- MIT - Martin

      Postel:  A description of the gateway implemented at MIT.  The
      gateway was first developed by Noel Chiappa.  It is written in C.
      The MIT environment has 32 internal networks which are treated as
      subnets of the MITNET on the Internet.  The MIT gateways then do
      subnet routing in their interior protocol.  The subnet routing
      scheme is similar to GGP.  Liza has added an EGP implementation to
      this gateway.

      Muuss:

      Campus network/project Athena
      Dynamic routing
      Congestion control - grad student
                      +---------------+---+
       Class A net  : | 18|subnet|res|host|
                      +---------------+---+

      "Bridges" forward between subnets.

      Campus Network and Project Athena 65 VAX 750s, 200 IBM PCs.

      Hosts: Now = 400, 1986 = 3,000, 1990 = 10,000

      Subnets: Now = 42, 1985 = 60, 1990 = 200, (4 subnets/building)

      Protocols: Internet, DECnet, Chaosnet

Hinden, Postel, Muuss, & Reynolds                               [Page 2]



RFC 898                                                       April 1984
Gateway SIG Meeting Notes

      FiberOptic spine between campus buildings.

      MIT gateways:

         11/03s and 11/23s
         68000 on Abus
         6800 on Multibus (Bridge communications)

         MIT C gateway -
         Runs under MOS, bridge OS, homegrown OS. Multiple protocols,
         multiple interfaces.

         11/03 - 100 packets/sec.
         11/23 - 180 packets/sec.

         GGP - Gw/Gw
         EGP - Exterior Gw
         IGP - Interior Gw

         EGP:  Autonomous systems

         EGP:
           Neighbor acquisition
           Hello/I heard you
           Net reachability poll
           Net reachability message

      MIT IGP:

         IP header on EGP protocol
         Dest: net number, subnet number, 0, 0377 (broadcast address)

      IGP header:

         Autonomous system number
         Sequence number
         Tasks:
             Propagate exterior and subnet routing.

      Packets
         Ext route request, and update Routing server
             Default gateway
             Exceptional gateways