Improving the Robustness of Stateless Address Autoconfiguration (SLAAC) to Flash Renumbering Events
draft-ietf-6man-slaac-renum-01
IPv6 Maintenance (6man) Working Group F. Gont
Internet-Draft SI6 Networks
Updates: 4861, 4862 (if approved) J. Zorz
Intended status: Standards Track 6connect
Expires: February 27, 2021 R. Patterson
Sky UK
August 26, 2020
Improving the Robustness of Stateless Address Autoconfiguration (SLAAC)
to Flash Renumbering Events
draft-ietf-6man-slaac-renum-01
Abstract
In renumbering scenarios where an IPv6 prefix suddenly becomes
invalid, hosts on the local network will continue using stale
prefixes for an unacceptably long period of time, thus resulting in
connectivity problems. This document improves the reaction of IPv6
Stateless Address Autoconfiguration to such renumbering scenarios.
Status of This Memo
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This Internet-Draft will expire on February 27, 2021.
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Copyright (c) 2020 IETF Trust and the persons identified as the
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Gont, et al. Expires February 27, 2021 [Page 1]
Internet-Draft Reaction to Renumbering Events August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. SLAAC reaction to Flash-renumbering Events . . . . . . . . . 4
3.1. Renumbering without Explicit Signaling . . . . . . . . . 4
3.2. Renumbering with Explicit Signaling . . . . . . . . . . . 5
4. Improvements to Stateless Address Autoconfiguration (SLAAC) . 6
4.1. More Appropriate Lifetime Values . . . . . . . . . . . . 7
4.1.1. Router Configuration Variables . . . . . . . . . . . 7
4.1.2. Processing of PIO Lifetimes at Hosts . . . . . . . . 7
4.2. Honor Small PIO Valid Lifetimes . . . . . . . . . . . . . 7
4.3. Interface Initialization . . . . . . . . . . . . . . . . 8
4.4. Conveying Information in Router Advertisement (RA)
Messages . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5. Recovery from Stale Configuration Information without
Explicit Signaling . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6. Implementation Status . . . . . . . . . . . . . . . . . . . . 9
6.1. More Appropriate Lifetime Values . . . . . . . . . . . . 9
6.1.1. Router Configuration Variables . . . . . . . . . . . 9
6.1.2. Processing of PIO Lifetimes at Hosts . . . . . . . . 9
6.2. Honor Small PIO Valid Lifetimes . . . . . . . . . . . . . 10
6.2.1. Linux Kernel . . . . . . . . . . . . . . . . . . . . 10
6.2.2. NetworkManager . . . . . . . . . . . . . . . . . . . 10
6.3. Conveying Information in Router Advertisement (RA)
Messages . . . . . . . . . . . . . . . . . . . . . . . . 10
6.4. Recovery from Stale Configuration Information without
Explicit Signaling . . . . . . . . . . . . . . . . . . . 10
6.4.1. dhcpcd(8) . . . . . . . . . . . . . . . . . . . . . . 10
6.5. Other mitigations implemented in products . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
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