rfc681.txt

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   FOR USER PROGRAMS.  THUS IT IS  DESIRABLE  TO  MINIMIZE THE
   AMOUNT  OF  CODE ADDED TO THE BASIC UNIX KERNEL FOR THE NCP. FOR
   THIS REASON, THE NCP IS IMPLEMENTED IN TWO PARTS. ONE PART IS
   ROOTED  IN  THE  KERNEL  AND  MAKES UP THE NON-SWAPPABLE SECTION,
   ABOUT 3.5K WORDS OF CORE.  THE OTHER SECTION (CALLED THE NCP
   DAEMON)  DEALS  WITH USER REQUESTS TO OPEN AND CLOSE CONNECTIONS
   AND HANDLES THE STATUS TRAFFIC DESCRIBED ABOVE.  THE NCP DAEMON
   RUNS AS A SWAPPABLE USER PROCESS OF ABOUT 8.5K WORDS IN SIZE, AND
   COMMUNICATES WITH THE KERNEL VIA A SPECIAL FILE.                   6d

HARDWARE AND SOFTWARE REQUIREMENTS                                     7

   THE  NETWORK  SOFTWARE  FOR  UNIX  WAS  DEVELOPED  ON   A
   PDP-11/50,  WITH MEMORY MANAGEMENT, TWO RK05 DISK PACKS, TWO NINE
   TRACK MAGTAPE DRIVES, FOUR DECTAPE DRIVES, 32K WORDS OF CORE, AND
   THREE TERMINALS.  PRESENTLY THIS HAS BEEN EXPANDED TO ENCOMPASS A
   DH11 TERMINAL MULTIPLEXOR, AN  RP03  MOVING  HEAD  DISK,  A  TWIN
   PLATTER  RF11  FIXED  HEAD DISK, FLOATING POINT, AND 48K OF CORE.
   USER FILES ARE STORED ON THE RP03. THE RF11 IS  USED  AS  A  SWAP
   DISK  AND  FOR  TEMPORARY FILE STORAGE; ONE RK05 PLATTER CONTAINS
   THE SYSTEM FILES, AND THE SECOND CONTAINS  LOGIN  AND  ACCOUNTING
   INFORMATION.   IN THE NEAR FUTURE, THE SYSTEM WILL BE EXPANDED TO
   128K WORDS OF CORE MEMORY WITH 10 DIAL IN AND 10 HARD WIRED
   TERMINAL LINES.                                                    7a

   THE BASE OPERATING SYSTEM OCCUPIES 24.5K WORDS OF MEMORY. THIS
   SYSTEM INCLUDES A LARGE NUMBER OF DEVICE DRIVERS, AND ENJOYS A
   GENEROUS AMOUNT OF SPACE FOR I/O BUFFERS AND SYSTEM TABLES.   A
   MINIMAL  SYSTEM  WOULD  REQUIRE 40K WORDS OF HARDWARE MEMORY.  IT
   SHOULD BE NOTED THAT UNIX ALSO  REQUIRES  THE  MEMORY  MANAGEMENT
   OPTION OFFERED BY DEC TO RUN AT ALL.                               7b

   THE BASE OPERATING SYSTEM WAS DEVELOPED BY  BELL  LABORATORIES
   IN  MURRAY  HILL, NEW JERSEY.  THE BELL INSTALLATION SUPPORTS A
   HIGH SPEED PAPER TAPE READER-PUNCH,  NINE-TRACK  MAGNETIC TAPE,
   AND  DECTAPE.  BESIDES  THE CONSOLE TERMINAL, THERE ARE 14
   VARIABLE SPEED COMMUNICATION DATASETS, AND A 201  SERIES  DATASET
   FOR SPOOLING PRINTOUT TO A COMMUNAL LINE PRINTER.  THERE ARE ALSO
   SEVERAL ONE-OF-A-KIND DEVICES INCLUDING A VOICE RESPONSE UNIT,  A
   VOICE  SYNTHESIZER,  A  PHOTOTYPESETTER, A DIGITAL SWITCHING






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NWG/RFC# 681                                  JBP 14-MAY-75 14:38  32157
3/18/75     NETWORK UNIX                                     S. Holmgren



   NETWORK, AND A SATELLITE PDP-11/20 WHICH GENERATES VECTORS,
   CURVES, AND CHARACTERS FOR A TEKTRONIX 611 STORAGE-TUBE DISPLAY.   7c

RELIABILITY                                                            8

   AS  OF  THIS  WRITING, NETWORK UNIX HAS BEEN RUNNING ON A FULL
   TIME BASIS FOR ABOUT FOUR WEEKS.  DURING THAT PERIOD,  THERE WERE
   BETWEEN  THREE AND FOUR CRASHES A DAY.  THIS IS NOT A VALID
   INDICATOR BECAUSE MANY OF THE FAILURES WERE DUE TO HARDWARE
   COMPLICATIONS.  MORE RECENTLY THE HARDWARE HAS BEEN RE-CONFIGURED
   TO IMPROVE RELIABILITY AND THE CRASH RATE HAS BEEN REDUCED TO ONE
   A DAY  WITH A DOWN TIME OF 2-3 MINS.  THIS IS EXPECTED TO
   CONTINUE, BUT THE SAMPLING PERIOD HASNT BEEN LONG ENOUGH FOR ANY
   DEPENDABLE ANALYSIS.                                               8a

AVAILABILITY                                                           9

   ALTHOUGH  THE UNIX NETWORK SOFTWARE WAS DEVELOPED WITHOUT ARPA
   SUPPORT, THE CENTER FOR ADVANCED COMPUTATION IS  WILLING  TO
   PROVIDE IT GRATIS TO THE PEOPLE OF THE ARPA COMMUNITY.             9a

   HOWEVER BELL LABORATORIES MUST BE CONTACTED  FOR  A  LISCENSE  TO
   THE BASE SYSTEM ITSELF.  BELL'S POLICY IN THE PAST HAS BEEN TO
   LISCENSE THE SYSTEM TO UNIVERSITIES FOR  A  NOMINAL  FEE,
   $150.00,  AND  UNFORTUNATELY  FOR  A  COST OF $20,000.00 TO
   "NONUNIVERSITY" INSTITUTIONS.                                      9b

   IN THIS LIGHT BELL WAS APPROACHED TO SEE WHAT THEIR REACTION
   WOULD BE TO AN ARPA NETWORK WIDE LISCENSE,  THEY  SAID  THEY WERE
   OPEN  TO SUGGESTIONS IN THAT AREA.  SO SHOULD ENOUGH PEOPLE
   BECOME INTERESTED, PERHAPS A LESS EXPENSIVE FEE CAN BE
   NEGOTIATED.                                                        9c

   INTERESTED USERS  WHO  HAVE  EITHER  SOURCE  LISTINGS  OR SOURCE
   FILES INCLUDE:                                                     9d

   THE RAND CORPORATION WHICH IS USING OUR IMPLEMENTATION AS A BASIS
   FOR THEIR OWN VERSION.                                             9e

   LINCOLN LABORATORIES WHICH HAS A  SOURCE  LISTING  TO  BE USED AS
   AN AID IN EVALUATION OF THE UNIX SYSTEM.                           9f







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NWG/RFC# 681                                  JBP 14-MAY-75 14:38  32157
3/18/75     NETWORK UNIX                                     S. Holmgren



   THE INCO CORPORATION OF MC LEAN VIR.  HAS  A  LISTING  TO HELP IN
   THE INSTALLATION OF AN NCP INTO DEC'S RSTS OPERATING SYSTEM.       9g

   IN  ANY  CASE  WE  ARE WILLING TO HELP ANY GROUP WITH ACQUISITION
   OF A SYSTEM.                                                       9h

      FOR FURTHER INFORMATION CONCERNING THE SYSTEM CONTACT:         9h1

         STEVE HOLMGREN
         210 ADVANCED COMPUTATION BLDG.
         UNIVERSITY OF ILLINOIS
         URBANA ILLINOIS 61801

            (217)-333-8469
            OR
            HOLMGREN AT BBN

OUTLOOK AND FUTURE PLANS                                              10

   WITH  THE  ADVENT OF TELNET IN UNIX, CURRENT PLANS ARE TO RUN THE
   SYSTEM OVER THE NEXT ONE OR TWO MONTHS AND WORK  OUT  ANY
   REMAINING  BUGS.  WHILE  THIS IS GOING ON, EXTENSIVE BANDWITH AND
   LOAD  TESTING  IS  GOING  TO  TAKE  PLACE  AND   ANY   REASONABLE
   IMPROVEMENTS MADE.                                                10a

   AFTER TELNET HAS PROVED ITSELF RELIABLE, THE OPEN  SYSTEM CALL
   WILL BE EXPANDED TO INCLUDE FURTHER PARAMETERIZATION.  THIS
   PARAMETERIZATION WILL ENCOMPASS CONNECTIONS TO SPECIFIC  SOCKETS,
   SIMPLEX  CONNECTIONS  BASED  ON  A SOCKET ALREADY IN USE, AND THE
   ABILITY TO LISTEN ON A LOCAL SOCKET.                              10b

   AFTER  THOSE  EXTENSIONS,  NET MAIL, THEN NETWORK FTP AND FINALLY
   NETWORK RJE WILL BE IMPLEMENTED.  ALL WILL  RUN  AS  USER
   PROGRAMS SO THE KERNEL SYSTEM SIZE WILL NOT INCREASE.             10c

   THERE IS ALSO INTEREST IN IMPLEMENTING SOME OF  THE  PROCEDURE
   CALL  PROTOCOL  BEING  DEVELOPED BY THE NATIONAL SOFTWARE WORKS,
   BUT NO DEFINATE PLAN HAVE BEEN MADE.                              10d

ACKNOWLEDGEMENTS                                                      11

   I AM MUCH INDEBTED TO GARY GROSSMAN WHO  PARTICIPATED  IN THE
   DESIGN  AND WROTE THE NCP DAEMON; AND TO STEVE BUNCH WHO WAS THE





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NWG/RFC# 681                                  JBP 14-MAY-75 14:38  32157
3/18/75     NETWORK UNIX                                     S. Holmgren



   THE THIRD MEMBER OF OUR DESIGN GROUP  AND  WROTE  THE  KERNEL
   MESSAGE SOFTWARE.                                                 11a

   THE THREE OF US ARE PARTICULARLY APPRECIATIVE OF THE CRITICISM
   AND  SUPPORT  OF  DR.  HUGH FOLK, DR. PETER ALSBERG, GREG
   CHESSON, JOHN MULLEN, KARL KELLEY AND DAVE HEALY.                 11b

REFERENCES                                                            12

   1.  UNIX TIME-SHARING SYSTEM
   KEN THOMPSON AND DENNIS RITCHIE
   COMMUNICATIONS OF THE ACM
   JULY 1974, VOL 17, NUMBER 7                                       12a

   2.  SPECIFICATIONS FOR THE INTERCONNECTION OF A
   HOST TO AN IMP
   REPORT NO. 1822 BOLT BERANEK AND NEWMAN INC.
   CHAPTER 3, SYSTEM OPERATION                                       12b

   3.  HOST/HOST PROTOCOL FOR THE ARPA NETWORK
   ALEX MCKENZIE, BBN
   NIC DOCUMENT 8246                                                 12c

   4.  OFFICIAL INITIAL CONNECIION PROTOCOL
   DOCUMENT #2
   J. POSTEL,  UCLA-NMC
   NIC DOCUMENT 7101                                                 12d

   5.  ANTS MARK I USER'S GUIDE
   KARL KELLEY
   CENTER FOR ADVANCED COMPUTATION  2/1/74                           12e

   6.  ANTS MARK TWO SYSTEM
   KARL KELLEY
   CENTER FOR ADVANCED COMPUTATION  1/10/74                          12f













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