Recommendations on Filtering of IPv6 Packets Containing IPv6 Extension Headers
draft-gont-opsec-ipv6-eh-filtering-01

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Last updated 2014-08-16
Replaced by draft-ietf-opsec-ipv6-eh-filtering
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opsec                                                            F. Gont
Internet-Draft                                    UTN-FRH / SI6 Networks
Intended status: Best Current Practice                            W. Liu
Expires: February 17, 2015                           Huawei Technologies
                                                               R. Bonica
                                                        Juniper Networks
                                                         August 16, 2014

 Recommendations on Filtering of IPv6 Packets Containing IPv6 Extension
                                Headers
               draft-gont-opsec-ipv6-eh-filtering-01.txt

Abstract

   This document provides advice on the filtering of IPv6 packets based
   on the IPv6 Extension Headers and the IPv6 options they contain.
   Additionally, it discusses the operational and interoperability
   implications of discarding packets based on the IPv6 Extension
   Headers and IPv6 options they contain.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on February 17, 2015.

Copyright Notice

   Copyright (c) 2014 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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   (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

Gont, et al.            Expires February 17, 2015               [Page 1]
Internet-Draft     Filtering of IPv6 packets with EHs        August 2014

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Conventions Used in This Document . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  IPv6 Extension Headers  . . . . . . . . . . . . . . . . . . .   4
     3.1.  General Discussion  . . . . . . . . . . . . . . . . . . .   4
     3.2.  General Security Implications . . . . . . . . . . . . . .   5
     3.3.  Advice on the Handling of IPv6 Packets with Specific IPv6
           Extension Headers . . . . . . . . . . . . . . . . . . . .   5
   4.  IPv6 Options  . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  General Discussion  . . . . . . . . . . . . . . . . . . .  12
     4.2.  General Security Implications of IPv6 Options . . . . . .  13
     4.3.  Advice on the Handling of Packets with Specific IPv6
           Options . . . . . . . . . . . . . . . . . . . . . . . . .  13
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  24
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  24
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  24
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  24
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   Recent studies (see e.g.[I-D.gont-v6ops-ipv6-ehs-in-real-world])
   suggest that there is widespread filtering of IPv6 packets that
   contain IPv6 Extension Headers (EHs).  While some operators
   "officially" filter packets that contain IPv6 extension headers, it
   is possible that some of the measured packet drops be the result of
   improper configuration defaults, or inappropriate advice in this
   area.

   This document discusses the filtering of IPv6 packets based on the
   IPv6 Extension Headers and the IPv6 options they contain.  Since
   various protocols may use IPv6 Extension Headers (possibly with IPv6
   options), discarding packets based on the the IPv6 Extension Headers
   or IPv6 options they contain may have implications on the proper
   functioning of such protocols.  Thus, this document attempts to
   discuss the operational and interoperability implications of such
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