Gateway-Initiated Dual-Stack Lite Deployment
RFC 6674
Document | Type | RFC - Proposed Standard (July 2012; No errata) | |
---|---|---|---|
Authors | Frank Brockners , Sri Gundavelli , Sebastian Speicher , David Ward | ||
Last updated | 2015-10-14 | ||
Replaces | draft-gundavelli-softwire-gateway-init-ds-lite, draft-softwire-gateway-init-ds-lite | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6674 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
IESG note | Yong Cui (cuiyong@tsinghua.edu.cn) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) F. Brockners Request for Comments: 6674 S. Gundavelli Category: Standards Track Cisco ISSN: 2070-1721 S. Speicher Deutsche Telekom AG D. Ward Cisco July 2012 Gateway-Initiated Dual-Stack Lite Deployment Abstract Gateway-Initiated Dual-Stack Lite (GI-DS-Lite) is a variant of Dual- Stack Lite (DS-Lite) applicable to certain tunnel-based access architectures. GI-DS-Lite extends existing access tunnels beyond the access gateway to an IPv4-IPv4 NAT using softwires with an embedded Context Identifier that uniquely identifies the end-system to which the tunneled packets belong. The access gateway determines which portion of the traffic requires NAT using local policies and sends/ receives this portion to/from this softwire. 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/rfc6674. Brockners, et al. Standards Track [Page 1] RFC 6674 Gateway-Initiated DS-Lite July 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. Table of Contents 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Gateway-Initiated DS-Lite . . . . . . . . . . . . . . . . . . 4 4. Protocol and Related Considerations . . . . . . . . . . . . . 6 5. Softwire Management and Related Considerations . . . . . . . . 7 6. Softwire Embodiments . . . . . . . . . . . . . . . . . . . . . 8 7. Security Considerations . . . . . . . . . . . . . . . . . . . 10 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9.1. Normative References . . . . . . . . . . . . . . . . . . . 11 9.2. Informative References . . . . . . . . . . . . . . . . . . 12 Appendix A. GI-DS-Lite Deployment . . . . . . . . . . . . . . . . 13 A.1. Connectivity Establishment: Example Call Flow . . . . . . 13 A.2. GI-DS-Lite Applicability: Examples . . . . . . . . . . . . 14 Brockners, et al. Standards Track [Page 2] RFC 6674 Gateway-Initiated DS-Lite July 2012 1. Overview Gateway-Initiated Dual-Stack Lite (GI-DS-Lite) is a variant of Dual- Stack Lite (DS-Lite) [RFC6333], applicable to network architectures that use point-to-point tunnels between the access device and the access gateway. The access gateway in these models is designed to serve large numbers of access devices. Mobile architectures based on Mobile IPv6 [RFC6275], Proxy Mobile IPv6 [RFC5213], or GPRS Tunnelling Protocol (GTP) [TS29060], as well as broadband architectures based on PPP or point-to-point VLANs as defined by the Broadband Forum [TR59][TR101], are examples of this type of architecture. The DS-Lite approach leverages IPv4-in-IPv6 tunnels (or other tunneling modes) for carrying the IPv4 traffic from the customer network to the Address Family Transition Router (AFTR). An established softwire between the AFTR and the access device is used for traffic-forwarding purposes. This makes the inner IPv4 address irrelevant for traffic routing and allows sharing private IPv4 addresses [RFC1918] between customer sites within the service provider network. Similarly to DS-Lite, GI-DS-Lite enables the service provider toShow full document text