Recommendation on Stable IPv6 Interface Identifiers
RFC 8064
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Type |
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RFC - Proposed Standard
(February 2017; No errata)
Updates RFC 2497, RFC 2491, RFC 2492, RFC 2464, RFC 2467, RFC 4391, RFC 2470, RFC 5121, RFC 4338, RFC 5072, RFC 3572, RFC 2590, RFC 4291, RFC 3146 |
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Last updated |
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2017-02-22
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IETF
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plain text
pdf
html
bibtex
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Reviews |
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Bob Hinden
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Shepherd write-up |
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Show
(last changed 2016-09-29)
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IESG state |
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RFC 8064 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Suresh Krishnan
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Send notices to |
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"Robert M. Hinden" <bob.hinden@gmail.com>
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IANA review state |
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IANA OK - No Actions Needed
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IANA action state |
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No IANA Actions
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Internet Engineering Task Force (IETF) F. Gont
Request for Comments: 8064 SI6 Networks / UTN-FRH
Updates: 2464, 2467, 2470, 2491, 2492, A. Cooper
2497, 2590, 3146, 3572, 4291, Cisco
4338, 4391, 5072, 5121 D. Thaler
Category: Standards Track Microsoft
ISSN: 2070-1721 W. Liu
Huawei Technologies
February 2017
Recommendation on Stable IPv6 Interface Identifiers
Abstract
This document changes the recommended default Interface Identifier
(IID) generation scheme for cases where Stateless Address
Autoconfiguration (SLAAC) is used to generate a stable IPv6 address.
It recommends using the mechanism specified in RFC 7217 in such
cases, and recommends against embedding stable link-layer addresses
in IPv6 IIDs. It formally updates RFC 2464, RFC 2467, RFC 2470, RFC
2491, RFC 2492, RFC 2497, RFC 2590, RFC 3146, RFC 3572, RFC 4291, RFC
4338, RFC 4391, RFC 5072, and RFC 5121. This document does not
change any existing recommendations concerning the use of temporary
addresses as specified in RFC 4941.
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 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/rfc8064.
Gont, et al. Standards Track [Page 1]
RFC 8064 Default Interface Identifiers February 2017
Copyright Notice
Copyright (c) 2017 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. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Generation of IPv6 Interface Identifiers with SLAAC . . . . . 5
4. Future Work . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
Gont, et al. Standards Track [Page 2]
RFC 8064 Default Interface Identifiers February 2017
1. Introduction
[RFC4862] specifies Stateless Address Autoconfiguration (SLAAC) for
IPv6 [RFC2460], which typically results in hosts configuring one or
more "stable" addresses composed of a network prefix advertised by a
local router, and an Interface Identifier (IID) [RFC4291] that
typically embeds a stable link-layer address (e.g., an IEEE LAN MAC
address).
In some network technologies and adaptation layers, the use of an IID
based on a link-layer address may offer some advantages. For
example, [RFC6282] allows for the compression of IPv6 datagrams over
IEEE 802.15.4-based networks [RFC4944] when the IID is based on the
underlying link-layer address.
The security and privacy implications of embedding a stable link-
layer address in an IPv6 IID have been known for some time now and
are discussed in great detail in [RFC7721]. They include:
o Network-activity correlation
o Location tracking
o Address scanning
o Device-specific vulnerability exploitation
More generally, the reuse of identifiers that have their own
semantics or properties across different contexts or scopes can be
detrimental for security and privacy [NUM-IDS]. In the case of
traditional stable IPv6 IIDs, some of the security and privacy
implications are dependent on the properties of the underlying link-
layer addresses (e.g., whether the link-layer address is ephemeral or
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