Recommendations for Prefix Binding in the Softwire DS-Lite Context
draft-vinapamula-softwire-dslite-prefix-binding-07

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Last updated 2015-08-05 (latest revision 2015-07-01)
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Network Working Group                                      S. Vinapamula
Internet-Draft                                          Juniper Networks
Intended status: Best Current Practice                      M. Boucadair
Expires: January 2, 2016                                  France Telecom
                                                            July 1, 2015

   Recommendations for Prefix Binding in the Softwire DS-Lite Context
           draft-vinapamula-softwire-dslite-prefix-binding-07

Abstract

   This document discusses issues induced by the change of the Dual-
   Stack Lite (DS-Lite) Basic Bridging BroadBand (B4) IPv6 address and
   sketches a set of recommendations to solve those issues.

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   This Internet-Draft will expire on January 2, 2016.

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   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  The Problem . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Introducing Subscriber-Mask . . . . . . . . . . . . . . . . .   4
   4.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative references  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative references  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   IPv6 deployment models assume IPv6 prefixes are delegated by Service
   Providers to the connected CPEs (Customer Premises Equipments) or
   hosts, which in turn derive IPv6 addresses out of that prefix.  In
   the case of DS-Lite [RFC6333], that is an IPv4 service continuity
   mechanism over an IPv6 network, the Basic Bridging BroadBand (B4)
   element derives an IPv6 address for the IPv4-in-IPv6 softwire setup
   purposes.

   The B4 element might obtain a new IPv6 address, for a variety of
   reasons that include (but are not limited to) a reboot of the CPE,
   power outage, DHCPv6 lease expiry, or other actions undertaken by the
   Service Provider.  If this occurs, traffic forwarded to a B4's
   previous IPv6 address may never reach its destination or be delivered
   to another B4 that now uses the address formerly assigned to the
   original B4.  This situation affects all mapping types, both implicit
   (e.g., by sending a TCP SYN) and explicit (e.g., using Port Control
   Protocol (PCP) [RFC6887]).  The problem is further elaborated in
   Section 2.

   This document proposes recommendations to soften the impact of such
   renumbering issues (Section 4).

   Note that in some deployments, CPE renumbering may be required to
   accommodate some privacy-related requirements to avoid the same
   prefix be assigned to the same customer.  It is out of scope of this
   document to discuss such contexts.

   This document complements [RFC6908].

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1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].
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