ISO Transport Service on top of the TCP Version: 3 (RFC1006)
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2019-Feb-15
Internet Society Requests For Comment (RFCs)
M.T. Rose: AUTHOR [+1]
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. This memo specifies version 3 of the protocol and supersedes RFC-983. Changes between the protocol is described in RFC-983 and this memo are minor, but unfortunately incompatible.
M. Rose & D. Cass [Page 1]
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.
M. Rose & D. Cass [Page 1]
RFC 1006 May 1987
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.
A second approach is based on the observation that both the ARPA Internet protocol suite and the ISO protocol suite are both layered systems (though the former uses layering from a more pragmatic perspective). A key aspect of the layering principle is that of layer-independence. Although this section is redundant for most readers, a slight bit of background material is necessary to introduce this concept.
Externally, a layer is defined by two definitions:
a service-offered definition, which describes the services provided by the layer and the interfaces it provides to access those services; and,
a service-required definitions, which describes the services used by the layer and the interfaces it uses to access those services.
Collectively, all of the entities in the network which co-operate to provide the service are known as the service-provider. Individually, each of these entities is known as a service-peer.
Internally, a layer is defined by one definition:
a protocol definition, which describe...