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Assessment of ARPANET protocols (RFC0635)

IP.com Disclosure Number: IPCOM000140579D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2007-Jan-24
Document File: 16 page(s) / 40K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Cerf: AUTHOR

Abstract

This paper presents some theoretical and practical motivations for the redesign of the ARPANET communication protocols. Issues concerning multipacket messages, Host retransmission, duplicate detection, sequencing, and acknowledgment are discussed. Simplifications to the IMP/IMP protocol are proposed on the assumption that new Host level protocols are adopted. Familiarity with the current protocol designs is probably necessary since many of the arguments refer to details in the present protocol design.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 7% of the total text.

 Network Working Group                                        Vinton G. Cerf Request for Comments: 635                               Stanford University NIC: 30489

                  An Assessment of ARPANET Protocols

                           ABSTRACT

This paper presents some theoretical and practical motivations for the redesign of the ARPANET communication protocols. Issues concerning multipacket messages, Host retransmission, duplicate detection, sequencing, and acknowledgment are discussed. Simplifications to the IMP/IMP protocol are proposed on the assumption that new Host level protocols are adopted. Familiarity with the current protocol designs is probably necessary since many of the arguments refer to details in the present protocol design.

                               [Page 0]

RFC  635           An Assessment of ARPANET Protocols              May 1974

Introduction.

     The history of the Advanced Research Project Agency resource

sharing computer network (ARPANET) [6] is in many ways a history of

the study, development, and implementation of protocols. During the

early development of the network many important concepts were dis-

covered and introduced into the protocol design effort. Protocol

layering (functional separation of different levels of network trans-

mission), the notion of bilateral rendezvous to set up Host-to-Host

connections [l,2], and the definition of a Network Virtual Terminal

to aid in the specification of a Terminal-to-Host protocol [3,14] are

all examples of important early ideas. The tasks facing the ARPANET

design teams were often unclear, and frequently required agreements

which had never been contemplated before (e.g., common protocols to

permit different operating systems and hardware to communicate). The

success of the effort, seen in retrospect, is astonishing, and much

credit is due to those who were willing to commit themselves to the job

of putting the ARPANET together.

     Over the intervening five years since the ARPANET was first begun, we have learned a great deal about the design and behavior of the proto- cols in use. The Imp-to-Imp protocol [4] has undergone continuous re- vision, and the HOST/IMP interface specification [5] has been modified slightly. In retrospect and in the light of experience, it seems reasonable to reconsider some of the aspects of the designs and implemen- tations currently in use. Furthermore, the rapid development of national

                               [Page 1]

RFC  635           An Assessment of ARPANET Protocols              May 1974

 computer network projects around the world emphasizes the need for international cooperation in the design of communication protocols so that international...