Operational Implications of IPv6 Packets with Extension Headers
draft-ietf-v6ops-ipv6-ehs-packet-drops-05

Document Type Active Internet-Draft (v6ops WG)
Authors Fernando Gont  , Nick Hilliard  , Gert Doering , Warren Kumari  , Geoff Huston  , Will LIU 
Last updated 2021-02-25 (latest revision 2021-02-11)
Replaces draft-gont-v6ops-ipv6-ehs-packet-drops
Stream IETF
Intended RFC status Informational
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IPv6 Operations Working Group (v6ops)                            F. Gont
Internet-Draft                                              SI6 Networks
Intended status: Informational                               N. Hilliard
Expires: August 15, 2021                                            INEX
                                                              G. Doering
                                                             SpaceNet AG
                                                               W. Kumari
                                                                  Google
                                                               G. Huston
                                                                   APNIC
                                                                  W. Liu
                                                     Huawei Technologies
                                                       February 11, 2021

    Operational Implications of IPv6 Packets with Extension Headers
               draft-ietf-v6ops-ipv6-ehs-packet-drops-05

Abstract

   This document summarizes the operational implications of IPv6
   extension headers specified in the IPv6 protocol specification
   (RFC8200), and attempts to analyze reasons why packets with IPv6
   extension headers are often 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.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 15, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gont, et al.             Expires August 15, 2021                [Page 1]
Internet-Draft           IPv6 Extension Headers            February 2021

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Disclaimer  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Background Information  . . . . . . . . . . . . . . . . . . .   3
   4.  Previous Work on IPv6 Extension Headers . . . . . . . . . . .   5
   5.  Packet Forwarding Engine Constraints  . . . . . . . . . . . .   7
     5.1.  Recirculation . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Requirement to Process Layer-3/layer-4 information in
       Intermediate Systems  . . . . . . . . . . . . . . . . . . . .   8
     6.1.  ECMP and Hash-based Load-Sharing  . . . . . . . . . . . .   8
     6.2.  Enforcing infrastructure ACLs . . . . . . . . . . . . . .   9
     6.3.  DDoS Management and Customer Requests for Filtering . . .   9
     6.4.  Network Intrusion Detection and Prevention  . . . . . . .  10
     6.5.  Firewalling . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Operational Implications  . . . . . . . . . . . . . . . . . .  11
     7.1.  Inability to Find Layer-4 Information . . . . . . . . . .  11
     7.2.  Route-Processor Protection  . . . . . . . . . . . . . . .  11
     7.3.  Inability to Perform Fine-grained Filtering . . . . . . .  12
     7.4.  Security Concerns Associated with IPv6 Extension Headers   12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     11.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

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
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