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A Discard Prefix for IPv6
RFC 6666

Internet Engineering Task Force (IETF)                       N. Hilliard
Request for Comments: 6666                                          INEX
Category: Informational                                      D. Freedman
ISSN: 2070-1721                                                 Claranet
                                                             August 2012

                       A Discard Prefix for IPv6

Abstract

   Remote triggered black hole filtering describes a method of
   mitigating the effects of denial-of-service attacks by selectively
   discarding traffic based on source or destination address.  Remote
   triggered black hole routing describes a method of selectively re-
   routing traffic into a sinkhole router (for further analysis) based
   on destination address.  This document updates the "IPv6 Special
   Purpose Address Registry" by explaining why a unique IPv6 prefix
   should be formally assigned by IANA for the purpose of facilitating
   IPv6 remote triggered black hole filtering and routing.

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
   http://www.rfc-editor.org/info/rfc6666.

Hilliard & Freedman           Informational                     [Page 1]
RFC 6666                   IPv6 Discard Prefix               August 2012

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
   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
      1.1. Notational Conventions .....................................3
   2. A Discard Prefix for IPv6 .......................................3
   3. Operational Implications ........................................4
   4. IANA Considerations .............................................4
   5. Security Considerations .........................................4
   6. References ......................................................5
      6.1. Normative References .......................................5
      6.2. Informative References .....................................5

1.  Introduction

   Remote Triggered Black Hole (RTBH) filtering describes a class of
   methods of blocking IP traffic either from a specific source
   ([RFC5635]) or to a specific destination ([RFC3882]) on a network.
   RTBH routing describes a class of methods of re-routing IP traffic
   destined to the attacked/targeted host to a special path (tunnel)
   where a sniffer could capture the traffic for analysis.  Both of
   these methods operate by setting the next-hop address of an IP packet
   with a specified source or destination address to be a unicast prefix
   that is connected locally or remotely to a router's discard, null, or
   tunnel interface.  Typically, reachability information for this
   prefix is propagated throughout an autonomous system using a dynamic
   routing protocol such as BGP ([RFC3882]).  By deploying RTBH systems
   across a network, traffic to or from specific destinations may be
   selectively black-holed or re-routed to a sinkhole device in a manner
   that is efficient, scalable, and straightforward to implement.

Hilliard & Freedman           Informational                     [Page 2]
RFC 6666                   IPv6 Discard Prefix               August 2012

   On some networks, operators configure RTBH installations using
   [RFC1918] address space or the address blocks reserved for
   documentation in [RFC5737].  This approach is inadequate because RTBH
   configurations are not documentation, but rather operationally
   important features of many public-facing production networks.

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