Source Address Validation Improvement (SAVI) for Mixed Address Assignment Methods Scenario
RFC 8074

Document Type RFC - Proposed Standard (February 2017; No errata)
Last updated 2017-02-17
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Document shepherd Jean-Michel Combes
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IESG IESG state RFC 8074 (Proposed Standard)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                             J. Bi
Request for Comments: 8074                           Tsinghua University
Category: Standards Track                                         G. Yao
ISSN: 2070-1721                                Tsinghua University/Baidu
                                                              J. Halpern
                                                                Ericsson
                                                   E. Levy-Abegnoli, Ed.
                                                                   Cisco
                                                           February 2017

              Source Address Validation Improvement (SAVI)
             for Mixed Address Assignment Methods Scenario

Abstract

   In networks that use multiple techniques for address assignment, the
   spoofing of addresses assigned by each technique can be prevented
   using the appropriate Source Address Validation Improvement (SAVI)
   methods.  This document reviews how multiple SAVI methods can coexist
   in a single SAVI device and how collisions are resolved when the same
   binding entry is discovered by two or more methods.

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 7841.

   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/rfc8074.

Bi, et al.                   Standards Track                    [Page 1]
RFC 8074                        SAVI-MIX                   February 2017

Copyright Notice

   Copyright (c) 2017 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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Scope . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Recommendations for Assignment Separation . . . . . . . . . .   6
   6.  Resolving Binding Collisions  . . . . . . . . . . . . . . . .   6
     6.1.  Same Address on Different Binding Anchors . . . . . . . .   6
       6.1.1.  Basic Preference  . . . . . . . . . . . . . . . . . .   7
       6.1.2.  Exceptions  . . . . . . . . . . . . . . . . . . . . .   7
       6.1.3.  Multiple SAVI Device Scenario . . . . . . . . . . . .   8
     6.2.  Same Address on the Same Binding Anchor . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   9
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

Bi, et al.                   Standards Track                    [Page 2]
RFC 8074                        SAVI-MIX                   February 2017

1.  Introduction

   There are currently several Source Address Validation Improvement
   (SAVI) documents ([RFC6620], [RFC7513], and [RFC7219]) that describe
   the different methods by which a switch can discover and record
   bindings between a node's IP address and a binding anchor and use
   that binding to perform source address validation.  Each of these
   documents specifies how to learn on-link addresses, based on the
   technique used for their assignment: StateLess Address
   Autoconfiguration (SLAAC), the Dynamic Host Control Protocol (DHCP),
   and Secure Neighbor Discovery (SEND), respectively.  Each of these
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