RFC 938 (rfc938) - Page 2 of 16

Internet Reliable Transaction Protocol functional and interface specification

RFC 938                                                    February 1985
Internet Reliable Transaction Protocol


      of transaction packets being exchanged between multiple IRTP users
      on this host and statically paired IRTP users on the same remote
      host.

   1.3 Relationship to Other Protocols

      The IRTP is designed for use in a potentially lossy internet
      environment.  It requires that IP be under it.  The IP protocol
      number of IRTP is 28.

      Conversely, IRTP provides a reliable transport protocol for one or
      more user processes.  User processes must have well-known IRTP
      port numbers, and can communicate only with matching processes
      with the same port number.  (Note that the term port refers to a
      higher level protocol.  IRTP connections exists between two hosts,
      not between a host/port and another host/port.)

      These relationships are depicted below.

         +--------+    +--------+   +-----------+
         | port a |....| port x |   | TCP users |   Application Level
         +--------+    +--------+   +-----------+
               |          |            | ... |
             +--------------+       +-----------+
             |     IRTP     |       |    TCP    |   Host Level
             +--------------+       +-----------+
                    |                     |
         +--------------------------------------+
         |    Internet Protocol and ICMP        |   Internet Level
         +--------------------------------------+
                          |
         +--------------------------------------+
         |      Local Network Protocol          |   Network Level
         +--------------------------------------+

         Figure 1-1.  Relationship of IRTP to Other Protocols













Miller