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Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery (RFC6980) Disclosure Number: IPCOM000230020D
Original Publication Date: 2013-Aug-01
Included in the Prior Art Database: 2013-Aug-14
Document File: 20 page(s) / 21K

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Internet Society Requests For Comment (RFCs)

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The Neighbor Discovery Protocol (NDP) is specified in RFC 4861 [RFC4861]. It is used by both hosts and routers. Its functions include Neighbor Discovery (ND), Router Discovery (RD), address autoconfiguration, address resolution, Neighbor Unreachability Detection (NUD), Duplicate Address Detection (DAD), and redirection.

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Internet Engineering Task Force (IETF)                           F. Gont Request for Comments: 6980                        SI6 Networks / UTN-FRH Updates: 3971, 4861                                          August 2013 Category: Standards Track ISSN: 2070-1721

 Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery


   This document analyzes the security implications of employing IPv6    fragmentation with Neighbor Discovery (ND) messages.  It updates RFC    4861 such that use of the IPv6 Fragmentation Header is forbidden in    all Neighbor Discovery messages, thus allowing for simple and    effective countermeasures for Neighbor Discovery attacks.  Finally,    it discusses the security implications of using IPv6 fragmentation    with SEcure Neighbor Discovery (SEND) and formally updates RFC 3971    to provide advice regarding how the aforementioned security    implications can be mitigated.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Gont                         Standards Track                    [Page 1]
 RFC 6980                ND and IPv6 Fragmentation            August 2013

 Copyright Notice

   Copyright (c) 2013 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    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    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. Traditional Neighbor Discovery and IPv6 Fragmentation ...........4    3. SEcure Neighbor Discovery (SEND) and IPv6 Fragmentation .........5    4. Rationale for Forbidding IPv6 Fragmentation in Neighbor       Discovery .......................................................6   ...