Internet Engineering Task Force (IETF) A. Zimmermann
Request for Comments: 7805
Obsoletes: 675 721 761 813 816 879 896 W. Eddy
1078 6013 MTI Systems
Updates: 7414 L. Eggert
Category: Informational NetApp
ISSN: 2070-1721 April 2016 Moving Outdated TCP Extensions and TCP-Related Documents
to Historic or Informational Status
This document reclassifies several TCP extensions and TCP-related
documents that either have been superseded, have never seen
widespread use, or are no longer recommended for use to "Historic"
status. The affected documents are RFCs 675, 721, 761, 813, 816,
879, 896, 1078, and 6013. Additionally, this document reclassifies
RFCs 700, 794, 814, 817, 872, 889, 964, and 1071 to "Informational"
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
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to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 22. Status Changes . . . . . . . . . . . . . . . . . . . . . . . 32.1. Moving to "Historic" Status . . . . . . . . . . . . . . . 32.2. Moving to "Informational" Status . . . . . . . . . . . . 43. Security Considerations . . . . . . . . . . . . . . . . . . . 54. References . . . . . . . . . . . . . . . . . . . . . . . . . 54.1. Normative References . . . . . . . . . . . . . . . . . . 54.2. Informative References . . . . . . . . . . . . . . . . . 7
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 81. Introduction
TCP has a long history. Over time, many RFCs have accumulated that
describe aspects of the TCP protocol, implementation, and extensions.
Some of these have been superseded, are no longer recommended for
use, or have simply never seen widespread use.
Sections 6 and 7.1 of the TCP roadmap document [RFC7414] already
reclassified a number of TCP extensions as "Historic" and describes
the reasons for doing so, but it did not instruct the RFC Editor to
change the status of these RFCs in the RFC database. The purpose of
this document is to do just that.
In addition, this document reclassifies all other documents mentioned
in the TCP roadmap that currently have an "Unknown" status to either
"Historic" or "Informational".
2. Status Changes
The following two sections give a short justification why a specific
TCP extension or a TCP-related document is being reclassified as
"Historic" or "Informational". In addition, the letter code after an
RFC number indicates from which original status a particular RFC is
changed to "Historic" or "Informational" (see BCP 9 [RFC2026] for an
explanation of these categories):
S - Standards Track (Proposed Standard, Draft Standard, or
E - Experimental
I - Informational
H - Historic
B - Best Current Practice
U - Unknown (not formally defined)
For the content of the documents itself, the reader is referred
either to the corresponding RFC or, for a brief description, to the
TCP roadmap document [RFC7414].
2.1. Moving to "Historic" Status
This document changes the status of the following RFCs to "Historic"
o [RFC675] U, "Specification of Internet Transmission Control
Program" was replaced by the final TCP specification [RFC793]
o [RFC721] U, "Out-of-Band Control Signals in a Host-to-Host
Protocol" was a proposal that was not incorporated into the final
TCP specification [RFC793]
o [RFC761] U, "DoD Standard Transmission Control Protocol" was
replaced by the final TCP specification [RFC793]
o [RFC813] U, "Window and Acknowledgement Strategy in TCP" was
incorporated into [RFC1122]
o [RFC816] U, "Fault Isolation and Recovery" was incorporated into
[RFC1122] and [RFC5461]
o [RFC879] U, "The TCP Maximum Segment Size and Related Topics" was
incorporated into [RFC1122] and [RFC6691]
o [RFC896] U, "Congestion Control in IP/TCP Internetworks" was
incorporated into [RFC1122] and [RFC6633]
o [RFC1078] U, "TCP Port Service Multiplexer (TCPMUX)" should be
* It modifies the TCP connection establishment semantics by also
completing the three-way handshake when a service is not
* It requires all new connections to be received on a single
port, which limits the number of connections between two
* It complicates firewall implementation and management because
all services share the same port number.
* There are very limited deployments, and these are not used in
an Internet context. (The only reported use is for SGI's Data
Migration Facility in private networks.)
o [RFC6013] E, "TCP Cookie Transactions (TCPCT)" should be
deprecated (although only published in 2011) because:
* It uses the experimental TCP option codepoints, which prohibit
a large-scale deployment.
* [RFC7413] and [TCP-EDO] are alternatives that have more "rough
consensus and running code" behind them.
* There are no known wide-scale deployments.
2.2. Moving to "Informational" Status
This document changes the status of the following RFCs to
o [RFC700] U, "A Protocol Experiment", which presents a field report
about the deployment of a very early version of TCP
o [RFC794] U, "Pre-emption", which recommends that operating
systems need to manage their limited resources, which may include
TCP connection state
o [RFC814] U, "Name, Addresses, Ports, and Routes", which gives
guidance on designing tables and algorithms to keep track of
various identifiers within a TCP/IP implementation
o [RFC817] U, "Modularity and Efficiency in Protocol
Implementation", which contains general implementation suggestions
The authors thank John Leslie, Pasi Sarolahti, Richard Scheffenegger,
Martin Stiemerling, Joe Touch, Valdis Kletnieks, and Greg Skinner for
Lars Eggert has received funding from the European Union's Horizon
2020 research and innovation program 2014-2018 under grant agreement
No. 644866 (SSICLOPS). This document reflects only the authors'
views, and the European Commission is not responsible for any use
that may be made of the information it contains.
Wesley M. Eddy
Suite 170, 18013 Cleveland Parkway
Cleveland, OH 44135
Phone: +49 151 12055791