Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Option for Dual-Stack Lite
RFC 6334
Document | Type | RFC - Proposed Standard (August 2011; No errata) | |
---|---|---|---|
Authors | David Hankins , Tomek Mrugalski | ||
Last updated | 2015-10-14 | ||
Replaces | draft-dhankins-softwire-tunnel-option | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6334 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
IESG note | Dave Ward (dward@juniper.net) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) D. Hankins Request for Comments: 6334 Google Category: Standards Track T. Mrugalski ISSN: 2070-1721 Gdansk University of Technology August 2011 Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Option for Dual-Stack Lite Abstract This document specifies a DHCPv6 option that is meant to be used by a Dual-Stack Lite Basic Bridging BroadBand (B4) element to discover the IPv6 address of its corresponding Address Family Transition Router (AFTR). 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/rfc6334. Copyright Notice Copyright (c) 2011 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. Hankins & Mrugalski Standards Track [Page 1] RFC 6334 DS-Lite DHCPv6 Option August 2011 Table of Contents 1. Introduction ....................................................2 2. Requirements Language ...........................................2 3. The AFTR-Name DHCPv6 Option .....................................2 4. DHCPv6 Server Behavior ..........................................4 5. DHCPv6 Client Behavior ..........................................4 6. Security Considerations .........................................5 7. IANA Considerations .............................................6 8. Acknowledgements ................................................6 9. Normative References ............................................6 1. Introduction Dual-Stack Lite [RFC6333] is a solution to offer both IPv4 and IPv6 connectivity to customers that are addressed only with an IPv6 prefix (no IPv4 address is assigned to the attachment device). One of its key components is an IPv4-over-IPv6 tunnel, commonly referred to as a softwire. A DS-Lite "Basic Bridging BroadBand" (B4) device will not know if the network it is attached to offers Dual-Stack Lite service, and if it did would not know the remote endpoint of the tunnel to establish a softwire. To inform the B4 of the Address Family Transition Router's (AFTR) location, a DNS [RFC1035] hostname may be used. Once this information is conveyed, the presence of the configuration indicating the AFTR's location also informs a host to initiate Dual-Stack Lite (DS-Lite) service and become a softwire initiator. To provide the conveyance of the configuration information, a single DHCPv6 [RFC3315] option is used, expressing the AFTR's Fully Qualified Domain Name (FQDN) to the B4 element. The details of how the B4 establishes an IPv4-in-IPv6 softwire to the AFTR are out of scope for this document. 2. 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 RFC 2119 [RFC2119]. 3. The AFTR-Name DHCPv6 Option The AFTR-Name option consists of option-code and option-len fields (as all DHCPv6 options have), and a variable-length tunnel-endpoint- name field containing a fully qualified domain name that refers to the AFTR to which the client MAY connect. Hankins & Mrugalski Standards Track [Page 2] RFC 6334 DS-Lite DHCPv6 Option August 2011 The AFTR-Name option SHOULD NOT appear in any DHCPv6 messages other than the following: Solicit, Advertise, Request, Renew, Rebind, Information-Request, and Reply. The format of the AFTR-Name option is shown in the following figure: 0 1 2 3Show full document text