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Internet Key Exchange Protocol Version 2 (IKEv2)
RFC 5996

Internet Engineering Task Force (IETF)                        C. Kaufman
Request for Comments: 5996                                     Microsoft
Obsoletes: 4306, 4718                                         P. Hoffman
Category: Standards Track                                 VPN Consortium
ISSN: 2070-1721                                                   Y. Nir
                                                             Check Point
                                                               P. Eronen
                                                             Independent
                                                          September 2010

            Internet Key Exchange Protocol Version 2 (IKEv2)

Abstract

   This document describes version 2 of the Internet Key Exchange (IKE)
   protocol.  IKE is a component of IPsec used for performing mutual
   authentication and establishing and maintaining Security Associations
   (SAs).  This document replaces and updates RFC 4306, and includes all
   of the clarifications from RFC 4718.

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/rfc5996.

Kaufman, et al.              Standards Track                    [Page 1]
RFC 5996                        IKEv2bis                  September 2010

Copyright Notice

   Copyright (c) 2010 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
   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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................5
      1.1. Usage Scenarios ............................................6
           1.1.1. Security Gateway to Security Gateway in
                  Tunnel Mode .........................................7
           1.1.2. Endpoint-to-Endpoint Transport Mode .................7
           1.1.3. Endpoint to Security Gateway in Tunnel Mode .........8
           1.1.4. Other Scenarios .....................................9
      1.2. The Initial Exchanges ......................................9
      1.3. The CREATE_CHILD_SA Exchange ..............................13
           1.3.1. Creating New Child SAs with the
                  CREATE_CHILD_SA Exchange ...........................14
           1.3.2. Rekeying IKE SAs with the CREATE_CHILD_SA
                  Exchange ...........................................15
           1.3.3. Rekeying Child SAs with the CREATE_CHILD_SA
                  Exchange ...........................................16
      1.4. The INFORMATIONAL Exchange ................................17
           1.4.1. Deleting an SA with INFORMATIONAL Exchanges ........17
      1.5. Informational Messages outside of an IKE SA ...............18
      1.6. Requirements Terminology ..................................19

Kaufman, et al.              Standards Track                    [Page 2]
RFC 5996                        IKEv2bis                  September 2010

      1.7. Significant Differences between RFC 4306 and This
           Document ..................................................20

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