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Implementation Advice for IPv6 Router Advertisement Guard (RA-Guard) (RFC7113) Disclosure Number: IPCOM000234884D
Original Publication Date: 2014-Feb-01
Included in the Prior Art Database: 2014-Feb-12
Document File: 26 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People



IPv6 Router Advertisement Guard (RA-Guard) is a mitigation technique for attack vectors based on ICMPv6 Router Advertisement [RFC4861] messages. [RFC6104] describes the problem statement of "Rogue IPv6 Router Advertisements", and [RFC6105] specifies the "IPv6 Router Advertisement Guard" functionality.

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Internet Engineering Task Force (IETF)                           F. Gont Request for Comments: 7113                           Huawei Technologies Updates: 6105                                              February 2014 Category: Informational ISSN: 2070-1721

   Implementation Advice for IPv6 Router Advertisement Guard (RA-Guard)


   The IPv6 Router Advertisement Guard (RA-Guard) mechanism is commonly    employed to mitigate attack vectors based on forged ICMPv6 Router    Advertisement messages.  Many existing IPv6 deployments rely on    RA-Guard as the first line of defense against the aforementioned    attack vectors.  However, some implementations of RA-Guard have been    found to be prone to circumvention by employing IPv6 Extension    Headers.  This document describes the evasion techniques that affect    the aforementioned implementations and formally updates RFC 6105,    such that the aforementioned RA-Guard evasion vectors are eliminated.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see 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                          Informational                     [Page 1]
 RFC 7113             RA-Guard Implementation Advice        February 2014

 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    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.  Evasion Techniques for Some RA-Guard Implementations . . . . .  3      2.1.  Attack Vector Based on IPv6 Extension Headers  . . ....