M. Rose & D. Cass 


Network Working Group                    Marshall T. Rose, Dwight E. Cass
Request for Comments: RFC 1006    Northrop Research and Technology Center
Obsoletes: RFC 983                                               May 1987



                ISO Transport Service on top of the TCP
                               Version: 3


Status of this Memo

   This memo specifies a standard for the Internet community. Hosts
   on the Internet that choose to implement ISO transport services
   on top of the TCP are expected to adopt and implement this
   standard.  TCP port 102 is reserved for hosts which implement this
   standard.  Distribution of this memo is unlimited.

   This memo specifies version 3 of the protocol and supersedes
   [RFC983].  Changes between the protocol as described in Request for
   Comments 983 and this memo are minor, but are unfortunately
   incompatible.

1.  Introduction and Philosophy

      The Internet community has a well-developed, mature set of
      transport and internetwork protocols (TCP/IP), which are quite
      successful in offering network and transport services to
      end-users. The CCITT and the ISO have defined various session,
      presentation, and application recommendations which have been
      adopted by the international community and numerous vendors.
      To the largest extent possible, it is desirable to offer these
      higher level directly in the ARPA Internet, without disrupting
      existing facilities.  This permits users to develop expertise
      with ISO and CCITT applications which previously were not
      available in the ARPA Internet.  It also permits a more
      graceful convergence and transition strategy from
      TCP/IP-based networks to ISO-based networks in the
      medium-and long-term.

      There are two basic approaches which can be taken when "porting"
      an ISO or CCITT application to a TCP/IP environment.  One
      approach is to port each individual application separately,
      developing local protocols on top of the TCP.  Although this is
      useful in the short-term (since special-purpose interfaces to the
      TCP can be developed quickly), it lacks generality.

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