Privacy Extensions for Stateless Address Autoconfiguration in IPv6
draft-ietf-6man-rfc4941bis-06
IPv6 Maintenance (6man) Working Group F. Gont
Internet-Draft SI6 Networks / UTN-FRH
Obsoletes: rfc4941 (if approved) S. Krishnan
Intended status: Standards Track Ericsson Research
Expires: August 12, 2020 T. Narten
IBM Corporation
R. Draves
Microsoft Research
February 9, 2020
Privacy Extensions for Stateless Address Autoconfiguration in IPv6
draft-ietf-6man-rfc4941bis-06
Abstract
Nodes use IPv6 stateless address autoconfiguration to generate
addresses using a combination of locally available information and
information advertised by routers. Addresses are formed by combining
network prefixes with an interface identifier. This document
describes an extension that causes nodes to generate global scope
addresses with randomized interface identifiers that change over
time. Changing global scope addresses over time makes it more
difficult for eavesdroppers and other information collectors to
identify when different addresses used in different transactions
correspond to the same node. This document obsoletes RFC4941.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 12, 2020.
Gont, et al. Expires August 12, 2020 [Page 1]
Internet-Draft Privacy Extensions to Autoconf February 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Problem Statement . . . . . . . . . . . . . . . . . . . . 4
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Extended Use of the Same Identifier . . . . . . . . . . . 4
2.2. Possible Approaches . . . . . . . . . . . . . . . . . . . 6
3. Protocol Description . . . . . . . . . . . . . . . . . . . . 6
3.1. Design Guidelines . . . . . . . . . . . . . . . . . . . . 6
3.2. Assumptions . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. Generation of Randomized Interface Identifiers . . . . . 8
3.3.1. Simple Randomized Interface Identifiers . . . . . . . 8
3.3.2. Hash-based Generation of Randomized Interface
Identifiers . . . . . . . . . . . . . . . . . . . . . 9
3.4. Generating Temporary Addresses . . . . . . . . . . . . . 10
3.5. Expiration of Temporary Addresses . . . . . . . . . . . . 12
3.6. Regeneration of Temporary Addresses . . . . . . . . . . . 12
3.7. Implementation Considerations . . . . . . . . . . . . . . 14
3.8. Defined Constants . . . . . . . . . . . . . . . . . . . . 14
4. Implications of Changing Interface Identifiers . . . . . . . 15
5. Significant Changes from RFC4941 . . . . . . . . . . . . . . 16
6. Future Work . . . . . . . . . . . . . . . . . . . . . . . . . 16
7. Security Considerations . . . . . . . . . . . . . . . . . . . 16
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 17
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.1. Normative References . . . . . . . . . . . . . . . . . . 17
9.2. Informative References . . . . . . . . . . . . . . . . . 19
Appendix A. Changes from RFC4941 [to be removed by the RFC-
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