Temporary Address Extensions for Stateless Address Autoconfiguration in IPv6
draft-ietf-6man-rfc4941bis-12
IPv6 Maintenance (6man) Working Group F. Gont
Internet-Draft SI6 Networks
Obsoletes: 4941 (if approved) S. Krishnan
Intended status: Standards Track Kaloom
Expires: May 6, 2021 T. Narten
R. Draves
Microsoft Research
November 2, 2020
Temporary Address Extensions for Stateless Address Autoconfiguration in
IPv6
draft-ietf-6man-rfc4941bis-12
Abstract
This document describes an extension to IPv6 Stateless Address
Autoconfiguration that causes hosts to generate global scope
addresses with randomized interface identifiers that change over
time. Changing global scope addresses over time limits the window of
time during which eavesdroppers and other information collectors may
trivially perform address-based network activity correlation when the
same address is employed for multiple transactions by the same host.
Additionally, it reduces the window of exposure of a host as being
accessible via an address that becomes revealed as a result of active
communication. This document obsoletes RFC4941.
Status of This Memo
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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 May 6, 2021.
Gont, et al. Expires May 6, 2021 [Page 1]
Internet-Draft Temporary Address Extensions to Autoconf November 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 . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . . . . . . 11
3.5. Expiration of Temporary Addresses . . . . . . . . . . . . 12
3.6. Regeneration of Temporary Addresses . . . . . . . . . . . 13
3.7. Implementation Considerations . . . . . . . . . . . . . . 14
3.8. Defined Constants and Configuration Variables . . . . . . 14
4. Implications of Changing Interface Identifiers . . . . . . . 15
5. Significant Changes from RFC4941 . . . . . . . . . . . . . . 17
6. Future Work . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. Implementation Status . . . . . . . . . . . . . . . . . . . . 19
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
9. Security Considerations . . . . . . . . . . . . . . . . . . . 19
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 20
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 21
11.1. Normative References . . . . . . . . . . . . . . . . . . 21
11.2. Informative References . . . . . . . . . . . . . . . . . 22
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