Neighbor Discovery Enhancement for DOS mititgation
draft-gashinsky-6man-v6nd-enhance-01

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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Informational                              I. Gashinsky
Expires: March 23, 2013                                           Yahoo!
                                                              J. Jaeggli
                                                                   Zynga
                                                         K. Chittimaneni
                                                                  Google
                                                      September 19, 2012

           Neighbor Discovery Enhancement for DOS mititgation
                  draft-gashinsky-6man-v6nd-enhance-01

Abstract

   In IPv4, subnets are generally small, made just large enough to cover
   the actual number of machines on the subnet.  In contrast, the
   default IPv6 subnet size is a /64, a number so large it covers
   trillions of addresses, the overwhelming number of which will be
   unassigned.  Consequently, simplistic implementations of Neighbor
   Discovery can be vulnerable to denial of service attacks whereby they
   attempt to perform address resolution for large numbers of unassigned
   addresses.  Such denial of attacks can be launched intentionally (by
   an attacker), or result from legitimate operational tools that scan
   networks for inventory and other purposes.  As a result of these
   vulnerabilities, new devices may not be able to "join" a network, it
   may be impossible to establish new IPv6 flows, and existing IPv6
   transported flows may be interrupted.

   This document describes a modification to the [RFC4861] neighbor
   discovery protocol aimed at improving the resilience of the neighbor
   discovery process.  We call this process Gratuitous neighbor
   discovery and it derives inspiration in part from analogous IPv4
   gratuitous ARP implementation.

Status of this Memo

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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 March 23, 2013.

Copyright Notice

   Copyright (c) 2012 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
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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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 4
     1.1.  Applicability . . . . . . . . . . . . . . . . . . . . . . . 4
   2.  The Problem . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  Background  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
   5.  Neighbor Discovery Overview . . . . . . . . . . . . . . . . . . 7
   6.  NDP Protocol Gratuitous NA  . . . . . . . . . . . . . . . . . . 7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . . . 8
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 9
     10.1. Normative References  . . . . . . . . . . . . . . . . . . . 9
     10.2. Informative References  . . . . . . . . . . . . . . . . . . 9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

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1.  Introduction

   This document describes modifications to the IPv6 Neighbor Discovery
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