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+Network Working Group                                  Ross Callon (BBN)
+Request for Comments: 986                      Hans-Werner Braun (UMich)
+                                                               June 1986
+
+                             WORKING DRAFT
+
+         Guidelines for the use of Internet-IP addresses in the
+                ISO Connectionless-Mode Network Protocol
+
+
+Status of This Memo
+
+   This RFC suggests a method to allow the existing IP addressing,
+   including the IP protocol field, to be used for the ISO
+   Connectionless Network Protocol (CLNP).  This is a draft solution to
+   one of the problems inherent in the use of "ISO-grams" in the DOD
+   Internet.  Related issues will be discussed in subsequent RFCs.  This
+   RFC suggests a proposed protocol for the ARPA-Internet community, and
+   requests discussion and suggestions for improvements.  Distribution
+   of this memo is unlimited.
+
+1.  Introduction
+
+   The CLNP is documented in [1], but for matters of completeness the
+   following illustration of the CLNP header is included here as
+   Figure 1.
+
+   The addressing part of the header is the subject of this RFC, i.e.,
+   the source and the destination address, respectively.  These
+   addresses are generally discussed in [2] and [3], with this document
+   presenting a specific method for addressing in the DOD Internetwork
+   environment, consistent with the international standardized NSAP
+   addresses.
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+Callon & Braun                                                  [Page 1]
+
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+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+                                            Octet                     
+  +--------------------------------------+                   +--------
+  |  Network Layer Protocol Identifier   |  1                :        
+  |--------------------------------------|                   :        
+  |           Length Indicator           |  2                :        
+  |--------------------------------------|                   :        
+  |   Version/Protocol Id Extension      |  3                :   Fixed
+  |--------------------------------------|                   :        
+  |              Lifetime                |  4                :    Part
+  |--------------------------------------|                   :        
+  |SP|MS|E/R|      Type                  |  5                :        
+  |--------------------------------------|                   :        
+  |           Segment Length             |  6,7              :        
+  |--------------------------------------|                   :        
+  |              Checksum                |  8,9              :        
+  |--------------------------------------|                   +--------
+  | Destination Address Length Indicator |  10               :        
+  |--------------------------------------|                   :        
+  |         Destination Address          |  11 through m-1   : Address
+  |--------------------------------------|                   :        
+  |    Source Address Length Indicator   |  m                :    Part
+  |--------------------------------------|                   :        
+  |            Source Address            |  m+1 through n-1  :        
+  |--------------------------------------|                   +--------
+  |         Data Unit Identifier         |  n,n+1            :        
+  |--------------------------------------|                   : Segment
+  |            Segment Offset            |  n+2,n+3          :   ation
+  |--------------------------------------|                   :        
+  |             Total Length             |  n+4,n+5          :    Part
+  |--------------------------------------|                   +--------
+  |                Options               |  n+6 through p    : Options
+                                                                  Part
+  |--------------------------------------|                   +--------
+  |                 Data                 |  p+1 through z    :    Data
+  +--------------------------------------+                   +--------
+
+                     Figure 1:   PDU Header Format
+
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+Callon & Braun                                                  [Page 2]
+
+
+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+2.  Addresses for Use in the Internet
+
+   This section describes the primary addresses used to address NSAPs in
+   the Internet.  A later section will describe a separate address
+   format for end systems and individual simple LANs that are attached
+   to the Internet only through intervening Public Data Networks.
+
+   The appropriate Authority and Format Identifier (AFI) is one octet in
+   length.
+
+      "The AFI consists of an integer with a value between 0 and 99 with
+      an abstract syntax of two decimal digits" [3], that is, the AFI
+      codes are binary coded decimal (BCD).
+
+   It specifies an ISO-6523-ICD assignment, and also that the Domain
+   Specific Part (DSP) of the address is based on binary.  The AFI octet
+   uses the value "47".  The ISO-6523-ICD format is used to emphasize
+   that this is an administrative assignment.  The usage of an ISO DCC
+   (Data Country Code) would be possible, but could be misleading due to
+   the fairly far spread geographical extent of the Internet-IP.
+
+   As required by the ISO addressing standard, the next two octets of
+   the address, in this case, specify the Initial Domain Identifier.
+   This two octet value is the International Code Designator (ICD)
+   assigned to the DOD Internet, "0006".
+
+   The remainder of the NSAP address is the Domain Specific Part (DSP).
+   This is assigned by the Internet administration, which is considered
+   to be an addressing domain.  The remainder of the address specifies a
+   one byte version number, the four byte Internet Protocol address and
+   a one byte IP user protocol field. The version number allows for
+   future extensions.  The IP address used is the same as the current
+   four octet IP address.  The user protocol field is the same as the
+   user protocol field in the current IP header.  This is necessary
+   because the ISO protocol considers identification of the user
+   protocol to be an addressing issue, and therefore does not allow for
+   the user protocol to be specified in the protocol header
+   independently from the address.
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+Callon & Braun                                                  [Page 3]
+
+
+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+   Therefore a source or destination address within the ISO
+   Connectionless Protocol, when used in the DOD Internet, looks as
+   follows:
+
+                                               Octet
+
+                    +------------------------+      
+                    |          AFI           |     1
+                    +------------------------+      
+                    |       IDI / ICD        |     2
+                    +--                    --+      
+                    |(specifies DOD Internet)|     3
+                    +------------------------+      
+                    |     Version Number     |     4
+                    +------------------------+      
+                    |                        |     5
+                    +---   four  byte     ---+      
+                    |                        |     6
+                    +---    Internet      ---+      
+                    |                        |     7
+                    +---   Address (IP)   ---+      
+                    |                        |     8
+                    +------------------------+      
+                    |  IP User Protocol ID   |     9
+                    +------------------------+      
+
+                   Figure 2: ISO IP address structure
+
+   The Authority and Format Identifier (AFI) is "47" (BCD).  The Initial
+   Domain Identifier (IDI) consists of the International Code Designator
+   (ICD) assigned to the Internet, and must contain the value "0006".
+   The Version Number must contain the value "01".  The Current IP
+   addresses and IP user protocol numbers can be found in [4].
+
+3.  Devices Attached to PDNs
+
+   Otherwise isolated end systems, which are attached to the Internet
+   only indirectly via public data networks, and simple LANs which are
+   similarly attached only via Public Data Networks, will make use of a
+   separate address format based on their X.121 address.
+
+   Figure 3 specifies the address for use by end systems attached to
+   PDNs. Here the AFI specifies an ISO-X.121 address format, with the
+   DSP based on binary.  The AFI occupies a single octet, and must take
+   the value "37" (hexadecimal).  The IDI contains the X.121 addresses
+
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+
+
+Callon & Braun                                                  [Page 4]
+
+
+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+   encoded in binary (using BCD), padded at the end if necessary with
+   all ones (binary "1111") to make up 7 full octets.  Finally, the DSP
+   contains a single octet, which specifies the user protocol.
+
+                                               Octet
+
+                    +------------------------+      
+                    |          AFI           |     1
+                    +------------------------+      
+                    |          IDI           |     2
+                    +--                    --+      
+                    |    (specifies X.121    |     3
+                    +--                    --+      
+                    |   address, padded to   |     4
+                    +--                    --+      
+                    |        7 octets)       |     5
+                    +--                    --+      
+                    |                        |     6
+                    +--                    --+      
+                    |                        |     7
+                    +--                    --+      
+                    |                        |     8
+                    +------------------------+      
+                    |  IP User Protocol ID   |     9
+                    +------------------------+      
+
+      Figure 3: ISO IP address structure for isolated end systems
+
+   Figure 4 specifies the address for use by simple LANs attached to
+   PDNs. This address is the same as the address used for end systems
+   directly attached to PDNs, except for the addition of the (variable
+   length) local address as used on the LAN.  Whether the address is of
+   the form shown in figure 3, or of the form shown in figure 4, is
+   determined by looking at the length of the address.
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+Callon & Braun                                                  [Page 5]
+
+
+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+                                              Octet
+
+                 +------------------------+           
+                 |          AFI           |     1     
+                 +------------------------+           
+                 |          IDI           |     2     
+                 +--                    --+           
+                 |    (specifies X.121    |     3     
+                 +--                    --+           
+                 |   address, padded to   |     4     
+                 +--                    --+           
+                 |        7 octets)       |     5     
+                 +--                    --+           
+                 |                        |     6     
+                 +--                    --+           
+                 |                        |     7     
+                 +--                    --+           
+                 |                        |     8     
+                 +------------------------+           
+                 |                        |     9     
+                 +--     local net      --+           
+                 |                        |           
+                 +--      address       --+           
+                 |                        |           
+                 +---                   --+ (variable 
+                 |                        |     sized)
+                 +------------------------+           
+                 |  IP User Protocol ID   |           
+                 +------------------------+           
+
+          Figure 4: ISO IP address structure for isolated LANs
+
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+Callon & Braun                                                  [Page 6]
+
+
+
+RFC 986                                                        June 1986
+DOD IP Addresses in ISO CLNP
+
+
+References
+
+   [1]  ISO, "Protocol for Providing the Connectionless-Mode Network
+        Services", RFC-926, ISO, December 1984.
+
+   [2]  ANSI, "Guidelines for the Specification of the Structure of the
+        Domain Specific Part (DSP) of the ISO Standard NSAP Address",
+        RFC-982, ANSI Working Document X3S3.3/85-258, April 1986.
+
+   [3]  ISO, Draft International Standard 8348/DAD2, "Information
+        Processing Systems  --  Data Communications  --  Network Service
+        Definition, Addendum 2 Covering Network Layer Addressing",
+        RFC-941, April 1985.
+
+   [4]  Reynolds, J. and J. Postel, "Assigned Numbers", RFC-960, USC
+        Information Sciences Institute, December 1985.
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+Callon & Braun                                                  [Page 7]
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