Shared Use of Experimental TCP Options
draft-ietf-tcpm-experimental-options-03

The information below is for an old version of the document
Document Type Active Internet-Draft (tcpm WG)
Last updated 2012-12-20 (latest revision 2012-11-28)
Replaces draft-touch-tcpm-experimental-options
Stream IETF
Intended RFC status Proposed Standard
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Needs a YES. Needs 9 more YES or NO OBJECTION positions to pass.
Responsible AD Wesley Eddy
IESG note Michael Scharf (michael.scharf@alcatel-lucent.com) is the document shepherd.
Send notices to tcpm-chairs@tools.ietf.org, draft-ietf-tcpm-experimental-options@tools.ietf.org
TCPM Working Group                                             J. Touch
Internet Draft                                                 USC/ISI
Intended status: Proposed Standard                    November 28, 2012
Expires: May 2013

                  Shared Use of Experimental TCP Options
                draft-ietf-tcpm-experimental-options-03.txt

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 28, 2013.

Copyright Notice

   Copyright (c) 2012 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
   publication of this document. Please review these documents
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   document must include Simplified BSD License text as described in

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Internet-Draft  Shared Use of Experimental TCP Options    November 2012

   Section 4.e of the Trust Legal Provisions and are provided without
   warranty as described in the Simplified BSD License.

Abstract

   This document describes how the experimental TCP option codepoints
   can support concurrent use through the use of a magic number. This
   mechanism avoids the need for a coordinated registry and is
   backward-compatible with currently known uses. It is recommended for
   all new TCP options that use these codepoints.

Table of Contents

   1. Introduction...................................................2
   2. Conventions used in this document..............................4
   3. TCP Experimental Option Structure..............................4
      3.1. Selecting a Magic Number..................................5
      3.2. Impact on TCP Option Processing...........................5
   4. Reducing the Impact of False Positives.........................6
   5. Migration to Assigned Options..................................7
   6. Security Considerations........................................7
   7. IANA Considerations............................................7
   8. References.....................................................8
      8.1. Normative References......................................8
      8.2. Informative References....................................8
   9. Acknowledgments................................................9

1. Introduction

   TCP includes options to enable new protocol capabilities that can be
   activated only where needed and supported [RFC793]. The space for
   identifying such options is small - 256 values, of which 30 are
   assigned at the time this document was published [IANA]. Two of
   these codepoints are allocated to support experiments (253, 254)
   [RFC4727]. These values are intended for testing purposes or anytime
   an assigned codepoint is either not warranted or available, e.g.,
   based on the maturity status of the defined capability (i.e.,
   Experimental or Informational, rather than Standards Track).

   The term "experimental TCP options" refers here to options that use
   the experimental TCP option codepoints [RFC4727]. Such experiments
   can be described in any type of RFC - Experimental, Informational,
   etc., and are intended to be used both in controlled environments
   and in are allowed in public deployments (when not enabled as
   default) [RFC3962]. Nothing prohibits deploying multiple experiments

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Internet-Draft  Shared Use of Experimental TCP Options    November 2012

   in the same environment - controlled or public. Further, some
   protocols are specified in Experimental or Informational RFCs, which
   either include parameters or design choices not yet understood or
   which might not be widely deployed [RFC2026]. TCP options in such
   RFCs are typically not eligible for assigned TCP option codepoints
   [RFC2780], and so there is a need to share use of the experimental
   option codepoints.

   There is currently no mechanism to support shared use of the
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