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NWG/RFC# 717 JBP 30-JUN-76 16:58 35873

Assigned Network Numbers

Network Working Group                                Jon Postel
Request for Comments 717                                 SRI-ARC
NIC 35873                                            1 July 1976

                Assigned Network Numbers

This note specifies the numbers assigned to identify networks for use in the inter-network protocol experiments. Additional Numbers are assigned by Jon Postel [POSTEL@ISIC or (415) 326-6200 x3718].

Assigned Network Numbers

  Name  Decimal     Octal
  
  ----------    -------     -----
  
  BBNRCCnet       3           3
  SanFranPRnet    7           7
  ARPANET        10          12
  BostonPRnet    11          13

Internetwork Header Format

For convenience the current Internetwork protocol header and TCP headers are reproduced here: 

  Octet Bit     Use              (Width)
  
    --- Beginning of protocol-independent information ---
  
    0   Destination net  (8)
    1-3 Destination host        (24)
    4   Source net       (8)
    5-7 Source host      (24)
    8-9 Data length in octets   (16)
    10  Header length in octets (8)
    11  0-3     ormat            (4)
      This field selects the appropriate gateway processing and is used
      to dispatch the packet to the appropriate protocol module in the  
      destination.  The following values are defined for this field:
         -- Escape; protocol is specified by a subsequent field
         -- TCP
         -- Secure TCP
        -16 -- Not allocated
        7 -- Cross internet debugging
  
   --- End of protocol-independent information
   --- Beginning of TCP specific information ---
  
   11   4-7     rotocol version (4)
   12-15        equence number   (32)
   16-17        indow            (16)
   18-20        ontrol (as before)      (24)
   21-23        estination port (24)
   24   Packet label for debugging(8)
   25-27        ource port       (24)
   28-31        cknowledgement number   (32)
   32-33        hecksum  (16)
   34-  Data             
  
   --- End of TCP specific information ---
  
   --- Beginning of short TCP specific information ---
  
   11   4-7     rotocol Version (4)
   12-25        equence number   (32)
   16   Destination KID  (8)
   17   Source KID       (8)
   18-19        ontrol (no special function field)(16)
   20-  Data
  
   --- End of short TCP specific information ---