Requirements for IPv6 Customer Edge Routers to Support IPv4-as-a-Service
RFC 8585
Internet Engineering Task Force (IETF) J. Palet Martinez
Request for Comments: 8585 The IPv6 Company
Category: Informational H. M.-H. Liu
ISSN: 2070-1721 D-Link Systems, Inc.
M. Kawashima
NEC Platforms, Ltd.
May 2019
Requirements for IPv6 Customer Edge Routers
to Support IPv4-as-a-Service
Abstract
This document specifies the IPv4 service continuity requirements for
IPv6 Customer Edge (CE) routers that are provided either by the
service provider or by vendors who sell through the retail market.
Specifically, this document extends the basic requirements for IPv6
CE routers as described in RFC 7084 to allow the provisioning of IPv6
transition services for the support of IPv4-as-a-Service (IPv4aaS) by
means of new transition mechanisms. The document only covers
IPv4aaS, i.e., transition technologies for delivering IPv4 in
IPv6-only access networks. IPv4aaS is necessary because there aren't
sufficient IPv4 addresses available for every possible customer/
device. However, devices or applications in the customer Local Area
Networks (LANs) may be IPv4-only or IPv6-only and still need to
communicate with IPv4-only services on the Internet.
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 candidates for any level of Internet
Standard; see 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
https://www.rfc-editor.org/info/rfc8585.
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RFC 8585 Requirements for IPv6 CE to Support IPv4aaS May 2019
Copyright Notice
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document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. LAN-Side Configuration . . . . . . . . . . . . . . . . . 5
3.2. Transition Technologies Support for IPv4 Service
Continuity (IPv4-as-a-Service) . . . . . . . . . . . . . 5
3.2.1. 464XLAT . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.2. Dual-Stack Lite (DS-Lite) . . . . . . . . . . . . . . 8
3.2.3. Lightweight 4over6 (lw4o6) . . . . . . . . . . . . . 9
3.2.4. MAP-E . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.5. MAP-T . . . . . . . . . . . . . . . . . . . . . . . . 10
4. IPv4 Multicast Support . . . . . . . . . . . . . . . . . . . 11
5. UPnP Support . . . . . . . . . . . . . . . . . . . . . . . . 11
6. Comparison to RFC 7084 . . . . . . . . . . . . . . . . . . . 12
7. Code Considerations . . . . . . . . . . . . . . . . . . . . . 12
8. Security Considerations . . . . . . . . . . . . . . . . . . . 13
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
10.1. Normative References . . . . . . . . . . . . . . . . . . 13
10.2. Informative References . . . . . . . . . . . . . . . . . 16
Appendix A. Usage Scenarios . . . . . . . . . . . . . . . . . . 17
Appendix B. End-User Network Architecture . . . . . . . . . . . 18
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
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RFC 8585 Requirements for IPv6 CE to Support IPv4aaS May 2019
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