Operational Implications of IPv6 Packets with Extension Headers
draft-gont-v6ops-ipv6-ehs-packet-drops-02

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IPv6 Operations Working Group (v6ops)                            F. Gont
Internet-Draft                                    SI6 Networks / UTN-FRH
Intended status: Informational                               N. Hilliard
Expires: August 7, 2016                                             INEX
                                                              G. Doering
                                                             SpaceNet AG
                                                                  W. Liu
                                                     Huawei Technologies
                                                               W. Kumari
                                                                  Google
                                                        February 4, 2016

    Operational Implications of IPv6 Packets with Extension Headers
               draft-gont-v6ops-ipv6-ehs-packet-drops-02

Abstract

   This document summarizes the security and operational implications of
   IPv6 extension headers, and attempts to analyze reasons why packets
   with IPv6 extension headers may be dropped in the public Internet.

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 August 7, 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

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   carefully, as they describe your rights and restrictions with respect
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Previous Work on IPv6 Extension Headers . . . . . . . . . . .   3
   3.  Security Implications . . . . . . . . . . . . . . . . . . . .   3
   4.  Operational Implications  . . . . . . . . . . . . . . . . . .   5
     4.1.  Requirement to process required layer-3/layer-4
           information . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Route-Processor Protection  . . . . . . . . . . . . . . .   7
     4.3.  Inability to Perform Fine-grained Filtering . . . . . . .   8
   5.  A Possible Attack Vector  . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   IPv6 Extension Headers (EHs) allow for the extension of the IPv6
   protocol, and provide support for core functionality such as IPv6
   fragmentation.  However, common implementation limitations suggest
   that EHs present a challenge for IPv6 packet routing equipment, and
   evidence exists to suggest that IPv6 packets with EHs may be
   intentionally dropped on the public Internet in some network
   deployments.

   The authors of this document have been involved in numerous
   discussions about IPv6 extension headers (both within the IETF and
   outside of it), and have noticed that a number of security and
   operational issues were unknown to the larger audience participating
   in these discussions.

   This document has the following goals:

   o  Raise awareness about the security and operational implications of
      IPv6 Extension Headers, and presents reason why some networks
      intentionally drop packets containing IPv6 Extension Headers.

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