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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	Format			 (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:
0 -- Escape; protocol is specified by a subsequent field
1 -- TCP
2 -- Secure TCP
3-16 -- Not allocated
17 -- Cross internet debugging

– End of protocol-independent information

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

– Beginning of TCP specific information —

 11   4-7	Protocol version	 (4)
 12-15	Sequence number		 (32)
 16-17	Window			 (16)
 18-20	Control (as before)	 (24)
 21-23	Destination port	 (24)
 24		Packet label for debugging(8)
 25-27	Source port		 (24)
 28-31	Acknowledgement number	 (32)
 32-33	Checksum		 (16)
 34-		Data

– End of TCP specific information —

– Beginning of short TCP specific information —

 11   4-7	Protocol Version	 (4)
 12-25	Sequence number		 (32)
 16		Destination KID		 (8)
 17		Source KID		 (8)
 18-19	Control (no special function field)(16)
 20-		Data

– End of short TCP specific information —