A Method for Generating Semantically Opaque Interface Identifiers (IIDs) with the Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
RFC 7943
| Document | Type |
RFC - Informational
(September 2016; No errata)
Was draft-gont-dhcpv6-stable-privacy-addresses (individual)
|
|
|---|---|---|---|
| Last updated | 2016-09-19 | ||
| Stream | ISE | ||
| Formats | plain text pdf html bibtex | ||
| IETF conflict review | conflict-review-gont-dhcpv6-stable-privacy-addresses | ||
| Stream | ISE state | Published RFC | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | Adrian Farrel | ||
| Shepherd write-up | Show (last changed 2016-03-30) | ||
| IESG | IESG state | RFC 7943 (Informational) | |
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | "Nevil Brownlee" <rfc-ise@rfc-editor.org> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | None | ||
Independent Submission F. Gont
Request for Comments: 7943 SI6 Networks / UTN-FRH
Category: Informational W. Liu
ISSN: 2070-1721 Huawei Technologies
September 2016
A Method for Generating Semantically Opaque Interface Identifiers (IIDs)
with the Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
Abstract
This document describes a method for selecting IPv6 Interface
Identifiers that can be employed by Dynamic Host Configuration
Protocol for IPv6 (DHCPv6) servers when leasing non-temporary IPv6
addresses to DHCPv6 clients. This method is a DHCPv6 server-side
algorithm that does not require any updates to the existing DHCPv6
specifications. The aforementioned method results in stable
addresses within each subnet, even in the presence of multiple DHCPv6
servers or DHCPv6 server reinstallments. It is a DHCPv6 variant of
the method specified in RFC 7217 for IPv6 Stateless Address
Autoconfiguration.
IESG Note
A predecessor to this document was earlier a working group document
in the DHC WG. The WG decided to stop further work in this area
because such work was not considered useful.
The proposal described in this document has an unaddressed failure
case that makes it unsuitable for use as the mechanism to provide the
claimed failover features for DHCPv6 servers. Specifically, when a
DHCPv6 client DECLINEs a provided address there is no recovery
mechanism described that will result in the DHCPv6 client obtaining a
working IPv6 address.
Gont & Liu Informational [Page 1]
RFC 7943 Stable and Opaque IIDs with DHCPv6 September 2016
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate 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
http://www.rfc-editor.org/info/rfc7943.
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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Applicability and Design Goals . . . . . . . . . . . . . . . 3
3. Method Specification . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 8
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1. Normative References . . . . . . . . . . . . . . . . . . 8
5.2. Informative References . . . . . . . . . . . . . . . . . 8
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
Gont & Liu Informational [Page 2]
RFC 7943 Stable and Opaque IIDs with DHCPv6 September 2016
1. Introduction
The benefits of stable IPv6 addresses are discussed in [RFC7721].
Providing address stability across server reinstallations or when a
database of previous DHCPv6 address leases is unavailable is of use
not only when a DHCPv6 server must be reinstalled or the address-
lease database becomes corrupted, but is also of use when
implementation constraints (e.g., a DHCPv6 server implementation on
an embedded device) make it impossible for a DHCPv6 server
implementation to maintain a database of previous DHCPv6 address
leases. Additionally, [RFC7031] describes scenarios where multiple
DHCPv6 servers are required to run in such a way as to provide
increased availability in case of server failures.
This document describes a method for selecting IPv6 Interface
Identifiers that can be employed by DHCPv6 servers when leasing non-
temporary IPv6 addresses to DHCPv6 clients (i.e., to be employed with
IA_NA options). This method is a DHCPv6 server-side algorithm that
does not require any updates to the existing DHCPv6 specifications.
The aforementioned method has the following properties:
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