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FCFS SAVI: First-Come, First-Served Source Address Validation Improvement for Locally Assigned IPv6 Addresses
RFC 6620

Internet Engineering Task Force (IETF)                       E. Nordmark
Request for Comments: 6620                                 Cisco Systems
Category: Standards Track                                     M. Bagnulo
ISSN: 2070-1721                                                     UC3M
                                                        E. Levy-Abegnoli
                                                           Cisco Systems
                                                                May 2012

     FCFS SAVI: First-Come, First-Served Source Address Validation
            Improvement for Locally Assigned IPv6 Addresses

Abstract

   This memo describes First-Come, First-Served Source Address
   Validation Improvement (FCFS SAVI), a mechanism that provides source
   address validation for IPv6 networks using the FCFS principle.  The
   proposed mechanism is intended to complement ingress filtering
   techniques to help detect and prevent source address spoofing.

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
   http://www.rfc-editor.org/info/rfc6620.

Nordmark, et al.             Standards Track                    [Page 1]
RFC 6620                        FCFS SAVI                       May 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Nordmark, et al.             Standards Track                    [Page 2]
RFC 6620                        FCFS SAVI                       May 2012

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................4
   2. Background to FCFS SAVI .........................................4
      2.1. Scope of FCFS SAVI .........................................4
      2.2. Constraints for FCFS SAVI Design ...........................5
      2.3. Address Ownership Proof ....................................5
      2.4. Binding Anchor Considerations ..............................6
      2.5. FCFS SAVI Protection Perimeter .............................6
      2.6. Special Cases .............................................10
   3. FCFS SAVI Specification ........................................11
      3.1. FCFS SAVI Data Structures .................................12
      3.2. FCFS SAVI Algorithm .......................................12
           3.2.1. Discovering On-Link Prefixes .......................12
           3.2.2. Processing of Transit Traffic ......................13
           3.2.3. Processing of Local Traffic ........................13
           3.2.4. FCFS SAVI Port Configuration Guidelines ............21
           3.2.5. VLAN Support .......................................22
      3.3. Default Protocol Values ...................................22
   4. Security Considerations ........................................22
      4.1. Denial-of-Service Attacks .................................22
      4.2. Residual Threats ..........................................23

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