Observations on the Dropping of Packets with IPv6 Extension Headers in the Real World
draft-ietf-v6ops-ipv6-ehs-in-real-world-01

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Replaces draft-gont-v6ops-ipv6-ehs-in-real-world
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IPv6 Operations Working Group (v6ops)                            F. Gont
Internet-Draft                                    SI6 Networks / UTN-FRH
Intended status: Informational                                J. Linkova
Expires: April 17, 2016                                           Google
                                                                T. Chown
                                               University of Southampton
                                                                  W. Liu
                                                     Huawei Technologies
                                                        October 15, 2015

 Observations on the Dropping of Packets with IPv6 Extension Headers in
                             the Real World
               draft-ietf-v6ops-ipv6-ehs-in-real-world-01

Abstract

   This document presents real-world data regarding the extent to which
   packets with IPv6 extension headers are dropped in the Internet (as
   measured in August 2014), and where in the network such dropping
   occurs.  The aforementioned results serve as a problem statement that
   is expected to trigger operational advice on the filtering of IPv6
   packets carrying IPv6 Extension Headers, so that the situation
   improves over time.  This document also explains how the
   aforementioned results were obtained, such that the corresponding
   measurements can be reproduced by other members of the community.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 17, 2016.

Gont, et al.             Expires April 17, 2016                 [Page 1]
Internet-Draft           IPv6 Extension Headers             October 2015

Copyright Notice

   Copyright (c) 2015 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Support of IPv6 Extension Headers in the Internet . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Reproducing Our Experiment . . . . . . . . . . . . .   9
     A.1.  Obtaining the List of Domain Names  . . . . . . . . . . .  10
     A.2.  Obtaining AAAA Resource Records . . . . . . . . . . . . .  10
     A.3.  Filtering the IPv6 Address Datasets . . . . . . . . . . .  10
     A.4.  Performing Measurements with Each IPv6 Address Dataset  .  11
     A.5.  Obtaining Statistics from our Measurements  . . . . . . .  12
   Appendix B.  Measurements Caveats . . . . . . . . . . . . . . . .  13
     B.1.  Isolating the Dropping Node . . . . . . . . . . . . . . .  13
     B.2.  Obtaining the Responsible Organization for the Packet
           Drops . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Appendix C.  Troubleshooting Packet Drops due to IPv6 Extension
                Headers  . . . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   IPv6 Extension Headers (EHs) allow for the extension of the IPv6
   protocol, and provide support for core functionality such as IPv6
   fragmentation.  While packets employing IPv6 Extension Headers have
   been suspected to be dropped in some IPv6 deployments, there was not
   much concrete data on the topic.  Some preliminary measurements have
   been presented in [PMTUD-Blackholes], [Gont-IEPG88] and
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