Improving the Robustness of Stateless Address Autoconfiguration (SLAAC) to Flash Renumbering Events
draft-ietf-6man-slaac-renum-00
IPv6 Maintenance (6man) Working Group F. Gont
Internet-Draft SI6 Networks
Updates: 4861, 4862 (if approved) J. Zorz
Intended status: Standards Track Go6 Institute
Expires: January 28, 2021 R. Patterson
Sky UK
July 27, 2020
Improving the Robustness of Stateless Address Autoconfiguration (SLAAC)
to Flash Renumbering Events
draft-ietf-6man-slaac-renum-00
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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 28, 2021.
Copyright Notice
Copyright (c) 2020 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
(https://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
Gont, et al. Expires January 28, 2021 [Page 1]
Internet-Draft Reaction to Renumbering Events July 2020
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 . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . 7
4.4. Conveying Information in Router Advertisement (RA)
Messages . . . . . . . . . . . . . . . . . . . . . . . . 7
4.5. Recovery from Stale Configuration Information without
Explicit Signaling . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Implementation Status . . . . . . . . . . . . . . . . . . . . 7
6.1. More Appropriate Lifetime Values . . . . . . . . . . . . 8
6.1.1. Router Configuration Variables . . . . . . . . . . . 8
6.1.2. Processing of PIO Lifetimes at Hosts . . . . . . . . 8
6.2. Honor Small PIO Valid Lifetimes . . . . . . . . . . . . . 9
6.2.1. NetworkManager . . . . . . . . . . . . . . . . . . . 9
6.3. Conveying Information in Router Advertisement (RA)
Messages . . . . . . . . . . . . . . . . . . . . . . . . 9
6.4. Recovery from Stale Configuration Information without
Explicit Signaling . . . . . . . . . . . . . . . . . . . 9
6.4.1. dhcpcd(8) . . . . . . . . . . . . . . . . . . . . . . 9
6.5. Other mitigations implemented in products . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 12
Show full document text