Client Link-Layer Address Option in DHCPv6
RFC 6939
Document | Type | RFC - Proposed Standard (May 2013; No errata) | |
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Authors | Gaurav Halwasia , Shwetha Bhandari , Wojciech Dec | ||
Last updated | 2015-10-14 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6939 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
IESG note | Ted Lemon (Ted.Lemon@nominum.com) is the document shepherd. | ||
Send notices to | (None) | ||
IANA | IANA review state | IANA - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) G. Halwasia Request for Comments: 6939 S. Bhandari Category: Standards Track W. Dec ISSN: 2070-1721 Cisco Systems May 2013 Client Link-Layer Address Option in DHCPv6 Abstract This document specifies the format and mechanism that is to be used for encoding the client link-layer address in DHCPv6 Relay-Forward messages by defining a new DHCPv6 Client Link-Layer Address option. 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/rfc6939. Copyright Notice Copyright (c) 2013 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. Halwasia, et al. Standards Track [Page 1] RFC 6939 DHCPv6 Client Link-Layer Address Option May 2013 Table of Contents 1. Introduction ....................................................2 2. Requirements Language ...........................................2 3. Problem Background and Scenario .................................2 4. DHCPv6 Client Link-Layer Address Option .........................4 5. DHCPv6 Relay Agent Behavior .....................................4 6. DHCPv6 Server Behavior ..........................................4 7. DHCPv6 Client Behavior ..........................................5 8. IANA Considerations .............................................5 9. Security Considerations .........................................5 10. Acknowledgements ...............................................6 11. References .....................................................6 11.1. Normative References ......................................6 11.2. Informative References ....................................6 1. Introduction This specification defines an optional mechanism and the related DHCPv6 option to allow first-hop DHCPv6 relay agents (relay agents that are connected to the same link as the client) to provide the client's link-layer address in the DHCPv6 messages being sent towards the server. 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. Problem Background and Scenario The DHCPv4 specification [RFC2131] provides a way to specify the client link-layer address in the DHCPv4 message header. A DHCPv4 message header has 'htype' and 'chaddr' fields to specify the client link-layer address type and the link-layer address, respectively. The client link-layer address thus learned can be used by the DHCPv4 server and the relay agent in different ways. In some of the deployments, DHCPv4 servers use 'chaddr' as a customer identifier and a key for lookup in the client lease database. With the incremental deployment of IPv6 to existing IPv4 networks, which results in a dual-stack network environment, there will be devices that act as both DHCPv4 and DHCPv6 clients. In service provider deployments, a typical DHCPv4 implementation will use the client link-layer address as one of the keys to build the DHCP client lease database. In dual-stack scenarios, operators need to be able Halwasia, et al. Standards Track [Page 2] RFC 6939 DHCPv6 Client Link-Layer Address Option May 2013 to associate DHCPv4 and DHCPv6 messages with the same client interface, based on an identifier that is common to the interface. The client link-layer address is such an identifier. Currently, the DHCPv6 specification [RFC3315] does not define a wayShow full document text