Unified IPv4-in-IPv6 Softwire Customer Premises Equipment (CPE): A DHCPv6-Based Prioritization Mechanism
RFC 8026
Document | Type | RFC - Proposed Standard (November 2016; No errata) | |
---|---|---|---|
Authors | Mohamed Boucadair , Ian Farrer | ||
Last updated | 2016-11-15 | ||
Replaces | draft-bfmk-softwire-unified-cpe | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Yong Cui | ||
Shepherd write-up | Show (last changed 2016-06-24) | ||
IESG | IESG state | RFC 8026 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Terry Manderson | ||
Send notices to | "Yong Cui" <cuiyong@tsinghua.edu.cn> | ||
IANA | IANA review state | IANA OK - Actions Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) M. Boucadair Request for Comments: 8026 Orange Category: Standards Track I. Farrer ISSN: 2070-1721 Deutsche Telekom AG November 2016 Unified IPv4-in-IPv6 Softwire Customer Premises Equipment (CPE): A DHCPv6-Based Prioritization Mechanism Abstract In IPv6-only provider networks, transporting IPv4 packets encapsulated in IPv6 is a common solution to the problem of IPv4 service continuity. A number of differing functional approaches have been developed for this, each having their own specific characteristics. As these approaches share a similar functional architecture and use the same data plane mechanisms, this memo specifies a DHCPv6 option, whereby a single instance of Customer Premises Equipment (CPE) can interwork with all of the standardized and proposed approaches to providing encapsulated IPv4-in-IPv6 services by providing a prioritization mechanism. 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/rfc8026. Boucadair & Farrer Standards Track [Page 1] RFC 8026 OPTION_S46_PRIORITY DHCPv6 Option November 2016 Copyright Notice Copyright (c) 2016 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 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1. Requirements Language . . . . . . . . . . . . . . . . 4 1.2. Rationale . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3. DHCPv6 S46 Priority Option . . . . . . . . . . . . . . . 5 1.4. DHCPv6 Client Behavior . . . . . . . . . . . . . . . . . 6 1.5. DHCPv6 Server Behavior . . . . . . . . . . . . . . . . . 7 2. Operator Deployment Considerations for Deploying Multiple Softwire Mechanisms . . . . . . . . . . . . . . . . . . . . . 7 2.1. Client Address Planning . . . . . . . . . . . . . . . . . 7 2.2. Backwards Compatability with Existing Softwire Clients . 7 3. Security Considerations . . . . . . . . . . . . . . . . . . . 8 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 4.1. S46 Mechanisms and Their Identifying Option Codes . . . . 8 5. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.1. Normative References . . . . . . . . . . . . . . . . . . 9 5.2. Informative References . . . . . . . . . . . . . . . . . 10 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11 Boucadair & Farrer Standards Track [Page 2] RFC 8026 OPTION_S46_PRIORITY DHCPv6 Option November 2016 1. Introduction IPv4 service continuity is one of the major technical challenges that must be considered during IPv6 migration. Over the past few years, a number of different approaches have been developed to assist with this problem (e.g., as described in [RFC6333], [RFC7596], and [RFC7597]). These approaches, referred to as "S46 mechanisms" in this document, exist in order to meet the particular deployment, scaling, addressing, and other requirements of different service providers' networks. A common feature shared among all of the differing modes is the integration of softwire tunnel endpoint functionality into the Customer Premises Equipment (CPE) router. Due to this inherent data plane similarity, a single CPE may be capable of supporting several different approaches. Users may also wish to configure a specificShow full document text