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RFC 8064 - úplné znění

Plné znění RFC 8064:






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/RFC 8064.












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 [RFC 4862] specifies Stateless Address Autoconfiguration (SLAAC) for IPv6 [RFC 2460], 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) [RFC 4291] 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, [RFC 6282] allows for the compression of IPv6 datagrams over IEEE 802.15.4-based networks [RFC 4944] 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 [RFC 7721]. 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 randomly generated), while other implications (e.g., reduction of the entropy of the IID) depend on the algorithm for generating the IID itself. In standardized recommendations for stable IPv6 IID generation meant to achieve particular security and privacy properties, it is necessary to recommend against embedding stable link-layer addresses in IPv6 IIDs. Furthermore, some popular IPv6 implementations have already deviated from the traditional stable IID generation scheme to mitigate the aforementioned security and privacy implications [Microsoft]. As a result of the aforementioned issues, this document changes the recommended default IID generation scheme for generating stable IPv6 addresses with SLAAC to that specified in [RFC 7217] and recommends against embedding stable link-layer addresses in IPv6 Interface Gont, et al. Standards Track [Page 3]
RFC 8064 Default Interface Identifiers February 2017 Identifiers, such that the aforementioned issues are mitigated. That is, this document simply replaces the default algorithm that is recommended to be employed when generating stable IPv6 IIDs. NOTE: [RFC 4291] defines the "Modified EUI-64 format" for IIDs. Appendix A of [RFC 4291] then describes how to transform an IEEE EUI-64 identifier, or an IEEE 802 48-bit MAC address from which an EUI-64 identifier is derived, into an IID in the Modified EUI-64 format. In a variety of scenarios, addresses that remain stable for the lifetime of a host's connection to a single subnet are viewed as desirable. For example, stable addresses may be viewed as beneficial for network management, event logging, enforcement of access control, provision of quality of service, or for server or router interfaces. Similarly, stable addresses (as opposed to temporary addresses [RFC 4941]) allow for long-lived TCP connections and are also usually desirable when performing server-like functions (i.e., receiving incoming connections). The recommendations in this document apply only in cases where implementations otherwise would have configured a stable IPv6 IID containing a link-layer address. For example, this document does not change any existing recommendations concerning the use of temporary addresses as specified in [RFC 4941] and the recommendations do not apply to cases where SLAAC is employed to generate non-stable IPv6 addresses (e.g., by embedding a link-layer address that is periodically randomized); in addition, this document does not introduce any new requirements regarding when stable addresses are to be configured. Thus, the recommendations in this document simply improve the security and privacy properties of stable addresses. 2. Terminology Stable address: An address that does not vary over time within the same network (as defined in [RFC 7721]). 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 [RFC 2119]. Gont, et al. Standards Track [Page 4]
RFC 8064 Default Interface Identifiers February 2017 3. Generation of IPv6 Interface Identifiers with SLAAC Nodes SHOULD implement and employ [RFC 7217] as the default scheme for generating stable IPv6 addresses with SLAAC. A link layer MAY also define a mechanism for stable IPv6 address generation that is more efficient and does not address the security and privacy considerations discussed in Section 1. The choice of whether or not to enable the security- and privacy-preserving mechanism SHOULD be configurable in such a case. By default, nodes SHOULD NOT employ IPv6 address generation schemes that embed a stable link-layer address in the IID. In particular, this document RECOMMENDS that nodes do not generate stable IIDs with the schemes specified in [RFC 2464], [RFC 2467], [RFC 2470], [RFC 2491], [RFC 2492], [RFC 2497], [RFC 2590], [RFC 3146], [RFC 3572], [RFC 4338], [RFC 4391], [RFC 5072], and [RFC 5121]. 4. Future Work At the time of this writing, the mechanisms specified in the following documents might require updates to be fully compatible with the recommendations in this document: o "Compression Format for IPv6 Datagrams over IEEE 802.15.4-Based Networks" [RFC 6282] o "Transmission of IPv6 Packets over IEEE 802.15.4 Networks" [RFC 4944] o "Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)" [RFC 6775] o "Transmission of IPv6 Packets over ITU-T G.9959 Networks" [RFC 7428] Future revisions or updates of these documents should consider the issues of privacy and security mentioned in Section 1 and explain any design and engineering considerations that lead to the use of stable IIDs based on a node's link-layer address. 5. Security Considerations This document recommends against the (default) use of predictable Interface Identifiers in IPv6 addresses. It recommends [RFC 7217] as the default scheme for generating IPv6 stable addresses with SLAAC, such that the security and privacy issues of IIDs that embed stable link-layer addresses are mitigated. Gont, et al. Standards Track [Page 5]
RFC 8064 Default Interface Identifiers February 2017 6. References 6.1. Normative References [RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC 2119, March 1997, <http://www.rfc-editor.org/info/RFC 2119>. [RFC 2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", RFC 2460, DOI 10.17487/RFC 2460, December 1998, <http://www.rfc-editor.org/info/RFC 2460>. [RFC 2464] Crawford, M., "Transmission of IPv6 Packets over Ethernet Networks", RFC 2464, DOI 10.17487/RFC 2464, December 1998, <http://www.rfc-editor.org/info/RFC 2464>. [RFC 2467] Crawford, M., "Transmission of IPv6 Packets over FDDI Networks", RFC 2467, DOI 10.17487/RFC 2467, December 1998, <http://www.rfc-editor.org/info/RFC 2467>. [RFC 2470] Crawford, M., Narten, T., and S. Thomas, "Transmission of IPv6 Packets over Token Ring Networks", RFC 2470, DOI 10.17487/RFC 2470, December 1998, <http://www.rfc-editor.org/info/RFC 2470>. [RFC 2491] Armitage, G., Schulter, P., Jork, M., and G. Harter, "IPv6 over Non-Broadcast Multiple Access (NBMA) networks", RFC 2491, DOI 10.17487/RFC 2491, January 1999, <http://www.rfc-editor.org/info/RFC 2491>. [RFC 2492] Armitage, G., Schulter, P., and M. Jork, "IPv6 over ATM Networks", RFC 2492, DOI 10.17487/RFC 2492, January 1999, <http://www.rfc-editor.org/info/RFC 2492>. [RFC 2497] Souvatzis, I., "Transmission of IPv6 Packets over ARCnet Networks", RFC 2497, DOI 10.17487/RFC 2497, January 1999, <http://www.rfc-editor.org/info/RFC 2497>. [RFC 2590] Conta, A., Malis, A., and M. Mueller, "Transmission of IPv6 Packets over Frame Relay Networks Specification", RFC 2590, DOI 10.17487/RFC 2590, May 1999, <http://www.rfc-editor.org/info/RFC 2590>. [RFC 3146] Fujisawa, K. and A. Onoe, "Transmission of IPv6 Packets over IEEE 1394 Networks", RFC 3146, DOI 10.17487/RFC 3146, October 2001, <http://www.rfc-editor.org/info/RFC 3146>. Gont, et al. Standards Track [Page 6]
RFC 8064 Default Interface Identifiers February 2017 [RFC 4291] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 4291, DOI 10.17487/RFC 4291, February 2006, <http://www.rfc-editor.org/info/RFC 4291>. [RFC 4338] DeSanti, C., Carlson, C., and R. Nixon, "Transmission of IPv6, IPv4, and Address Resolution Protocol (ARP) Packets over Fibre Channel", RFC 4338, DOI 10.17487/RFC 4338, January 2006, <http://www.rfc-editor.org/info/RFC 4338>. [RFC 4391] Chu, J. and V. Kashyap, "Transmission of IP over InfiniBand (IPoIB)", RFC 4391, DOI 10.17487/RFC 4391, April 2006, <http://www.rfc-editor.org/info/RFC 4391>. [RFC 4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless Address Autoconfiguration", RFC 4862, DOI 10.17487/RFC 4862, September 2007, <http://www.rfc-editor.org/info/RFC 4862>. [RFC 4941] Narten, T., Draves, R., and S. Krishnan, "Privacy Extensions for Stateless Address Autoconfiguration in IPv6", RFC 4941, DOI 10.17487/RFC 4941, September 2007, <http://www.rfc-editor.org/info/RFC 4941>. [RFC 4944] Montenegro, G., Kushalnagar, N., Hui, J., and D. Culler, "Transmission of IPv6 Packets over IEEE 802.15.4 Networks", RFC 4944, DOI 10.17487/RFC 4944, September 2007, <http://www.rfc-editor.org/info/RFC 4944>. [RFC 5072] Varada, S., Ed., Haskins, D., and E. Allen, "IP Version 6 over PPP", RFC 5072, DOI 10.17487/RFC 5072, September 2007, <http://www.rfc-editor.org/info/RFC 5072>. [RFC 5121] Patil, B., Xia, F., Sarikaya, B., Choi, JH., and S. Madanapalli, "Transmission of IPv6 via the IPv6 Convergence Sublayer over IEEE 802.16 Networks", RFC 5121, DOI 10.17487/RFC 5121, February 2008, <http://www.rfc-editor.org/info/RFC 5121>. [RFC 6282] Hui, J., Ed. and P. Thubert, "Compression Format for IPv6 Datagrams over IEEE 802.15.4-Based Networks", RFC 6282, DOI 10.17487/RFC 6282, September 2011, <http://www.rfc-editor.org/info/RFC 6282>. [RFC 6775] Shelby, Z., Ed., Chakrabarti, S., Nordmark, E., and C. Bormann, "Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)", RFC 6775, DOI 10.17487/RFC 6775, November 2012, <http://www.rfc-editor.org/info/RFC 6775>. Gont, et al. Standards Track [Page 7]
RFC 8064 Default Interface Identifiers February 2017 [RFC 7217] Gont, F., "A Method for Generating Semantically Opaque Interface Identifiers with IPv6 Stateless Address Autoconfiguration (SLAAC)", RFC 7217, DOI 10.17487/RFC 7217, April 2014, <http://www.rfc-editor.org/info/RFC 7217>. [RFC 7428] Brandt, A. and J. Buron, "Transmission of IPv6 Packets over ITU-T G.9959 Networks", RFC 7428, DOI 10.17487/RFC 7428, February 2015, <http://www.rfc-editor.org/info/RFC 7428>. 6.2. Informative References [Microsoft] Davies, J., "Understanding IPv6, 3rd. ed", page 83, Microsoft Press, 2012, <http://it-ebooks.info/book/1022/>. [NUM-IDS] Gont, F. and I. Arce, "Security and Privacy Implications of Numeric Identifiers Employed in Network Protocols", Work in Progress, February 2016. [RFC 3572] Ogura, T., Maruyama, M., and T. Yoshida, "Internet Protocol Version 6 over MAPOS (Multiple Access Protocol Over SONET/SDH)", RFC 3572, DOI 10.17487/RFC 3572, July 2003, <http://www.rfc-editor.org/info/RFC 3572>. [RFC 7721] Cooper, A., Gont, F., and D. Thaler, "Security and Privacy Considerations for IPv6 Address Generation Mechanisms", RFC 7721, DOI 10.17487/RFC 7721, March 2016, <http://www.rfc-editor.org/info/RFC 7721>. Acknowledgements The authors would like to thank (in alphabetical order) Bob Hinden, Ray Hunter, and Erik Nordmark, for providing a detailed review of this document. The authors would like to thank (in alphabetical order) Fred Baker, Carsten Bormann, Scott Brim, Brian Carpenter, Samita Chakrabarti, Tim Chown, Lorenzo Colitti, Jean-Michel Combes, Greg Daley, Esko Dijk, Ralph Droms, David Farmer, Brian Haberman, Ulrich Herberg, Philip Homburg, Jahangir Hossain, Jonathan Hui, Christian Huitema, Ray Hunter, Erik Kline, Sheng Jiang, Roger Jorgensen, Dan Luedtke, Kerry Lynn, George Mitchel, Gabriel Montenegro, Erik Nordmark, Simon Perreault, Tom Petch, Alexandru Petrescu, Michael Richardson, Arturo Servin, Mark Smith, Tom Taylor, Ole Troan, Tina Tsou, Glen Turner, Randy Turner, James Woodyatt, and Juan Carlos Zuniga, for providing valuable comments on earlier draft versions of this document. Gont, et al. Standards Track [Page 8]
RFC 8064 Default Interface Identifiers February 2017 Authors' Addresses Fernando Gont SI6 Networks / UTN-FRH Evaristo Carriego 2644 Haedo, Provincia de Buenos Aires 1706 Argentina Phone: +54 11 4650 8472 Email: fgont@si6networks.com URI: https://www.si6networks.com Alissa Cooper Cisco 707 Tasman Drive Milpitas, CA 95035 United States of America Phone: +1-408-902-3950 Email: alcoop@cisco.com URI: https://www.cisco.com/ Dave Thaler Microsoft Microsoft Corporation One Microsoft Way Redmond, WA 98052 Phone: +1 425 703 8835 Email: dthaler@microsoft.com Will (Shucheng) Liu Huawei Technologies Bantian, Longgang District Shenzhen 518129 China Email: liushucheng@huawei.com Gont, et al. Standards Track [Page 9]


English version: RFC 8064