Internet Engineering Task Force (IETF) Y. Nir, Ed.
Request for Comments: 6290 Check Point
Category: Standards Track D. Wierbowski
ISSN: 2070-1721 IBM
F. Detienne
P. Sethi
Cisco
June 2011
A Quick Crash Detection Method for the
Internet Key Exchange Protocol (IKE)
Abstract
This document describes an extension to the Internet Key Exchange
Protocol version 2 (IKEv2) that allows for faster detection of
Security Association (SA) desynchronization using a saved token.
When an IPsec tunnel between two IKEv2 peers is disconnected due to a
restart of one peer, it can take as much as several minutes for the
other peer to discover that the reboot has occurred, thus delaying
recovery. In this text, we propose an extension to the protocol that
allows for recovery immediately following the restart.
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 5741.
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/rfc6290.
Copyright Notice
Copyright (c) 2011 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
Nir, et al. Standards Track [Page 1]RFC 6290 Quick Crash Detection June 2011
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
1.1. Conventions Used in This Document . . . . . . . . . . . . 3
2. RFC 5996 Crash Recovery . . . . . . . . . . . . . . . . . . . 4
3. Protocol Outline . . . . . . . . . . . . . . . . . . . . . . . 5
4. Formats and Exchanges . . . . . . . . . . . . . . . . . . . . 6
4.1. Notification Format . . . . . . . . . . . . . . . . . . . 6
4.2. Passing a Token in the AUTH Exchange . . . . . . . . . . . 7
4.3. Replacing Tokens after Rekey or Resumption . . . . . . . . 8
4.4. Replacing the Token for an Existing SA . . . . . . . . . . 9
4.5. Presenting the Token in an Unprotected Message . . . . . . 9
5. Token Generation and Verification . . . . . . . . . . . . . . 10
5.1. A Stateless Method of Token Generation . . . . . . . . . . 11
5.2. A Stateless Method with IP Addresses . . . . . . . . . . . 11
5.3. Token Lifetime . . . . . . . . . . . . . . . . . . . . . . 12
6. Backup Gateways . . . . . . . . . . . . . . . . . . . . . . . 12
7. Interaction with Session Resumption . . . . . . . . . . . . . 13
8. Operational Considerations . . . . . . . . . . . . . . . . . . 14
8.1. Who Should Implement This Specification . . . . . . . . . 14
8.2. Response to Unknown Child SPI . . . . . . . . . . . . . . 15
9. Security Considerations . . . . . . . . . . . . . . . . . . . 16
9.1. QCD Token Generation and Handling . . . . . . . . . . . . 16
9.2. QCD Token Transmission . . . . . . . . . . . . . . . . . . 17
9.3. QCD Token Enumeration . . . . . . . . . . . . . . . . . . 18
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12.1. Normative References . . . . . . . . . . . . . . . . . . . 19
12.2. Informative References . . . . . . . . . . . . . . . . . . 19
Appendix A. The Path Not Taken . . . . . . . . . . . . . . . . . 20
A.1. Initiating a New IKE SA . . . . . . . . . . . . . . . . . 20
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