UDP Checksum Complement in the One-Way Active Measurement Protocol (OWAMP) and Two-Way Active Measurement Protocol (TWAMP)
RFC 7820

Document Type RFC - Experimental (March 2016; No errata)
Last updated 2016-03-30
Replaces draft-mizrahi-ippm-checksum-trailer
Stream IETF
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Stream WG state Submitted to IESG for Publication Jul 2015
Document shepherd Al Morton
Shepherd write-up Show (last changed 2015-10-15)
IESG IESG state RFC 7820 (Experimental)
Consensus Boilerplate Yes
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Responsible AD Spencer Dawkins
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                        T. Mizrahi
Request for Comments: 7820                                       Marvell
Category: Experimental                                        March 2016
ISSN: 2070-1721

                       UDP Checksum Complement in
          the One-Way Active Measurement Protocol (OWAMP) and
              Two-Way Active Measurement Protocol (TWAMP)

Abstract

   The One-Way Active Measurement Protocol (OWAMP) and the Two-Way
   Active Measurement Protocol (TWAMP) are used for performance
   monitoring in IP networks.  Delay measurement is performed in these
   protocols by using timestamped test packets.  Some implementations
   use hardware-based timestamping engines that integrate the accurate
   transmission time into every outgoing OWAMP/TWAMP test packet during
   transmission.  Since these packets are transported over UDP, the UDP
   Checksum field is then updated to reflect this modification.  This
   document proposes to use the last 2 octets of every test packet as a
   Checksum Complement, allowing timestamping engines to reflect the
   checksum modification in the last 2 octets rather than in the UDP
   Checksum field.  The behavior defined in this document is completely
   interoperable with existing OWAMP/TWAMP implementations.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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
   http://www.rfc-editor.org/info/rfc7820.

Mizrahi                       Experimental                      [Page 1]
RFC 7820           OWAMP and TWAMP Checksum Complement        March 2016

Copyright Notice

   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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   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 ....................................................3
   2. Conventions Used in This Document ...............................5
      2.1. Terminology ................................................5
      2.2. Abbreviations ..............................................5
   3. Using the UDP Checksum Complement in OWAMP and TWAMP ............6
      3.1. Overview ...................................................6
      3.2. OWAMP/TWAMP Test Packets with Checksum Complement ..........6
           3.2.1. Transmission of OWAMP/TWAMP with Checksum
                  Complement .........................................10
           3.2.2. Intermediate Updates of OWAMP/TWAMP with
                  Checksum Complement ................................10
           3.2.3. Reception of OWAMP/TWAMP with Checksum Complement ..10
      3.3. Interoperability with Existing Implementations ............10
      3.4. Using the Checksum Complement with or without
           Authentication ............................................11
           3.4.1. Checksum Complement in Authenticated Mode ..........11
           3.4.2. Checksum Complement in Encrypted Mode ..............11
   4. Security Considerations ........................................12
   5. References .....................................................12
      5.1. Normative References ......................................12
      5.2. Informative References ....................................13
   Appendix A. Checksum Complement Usage Example .....................14
   Acknowledgments ...................................................15
   Author's Address ..................................................15

Mizrahi                       Experimental                      [Page 2]
RFC 7820           OWAMP and TWAMP Checksum Complement        March 2016
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