An Internet Key Exchange Protocol Version 2 (IKEv2) Extension to Support EAP Re-authentication Protocol (ERP)
RFC 6867

Document Type RFC - Experimental (January 2013; No errata)
Was draft-nir-ipsecme-erx (individual in sec area)
Authors Yoav Nir  , Qin Wu 
Last updated 2015-10-14
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IESG IESG state RFC 6867 (Experimental)
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Responsible AD Sean Turner
IESG note Yaron Sheffer ( is the document shepherd
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Internet Engineering Task Force (IETF)                            Y. Nir
Request for Comments: 6867                                   Check Point
Category: Experimental                                             Q. Wu
ISSN: 2070-1721                                                   Huawei
                                                            January 2013

          An Internet Key Exchange Protocol Version 2 (IKEv2)
       Extension to Support EAP Re-authentication Protocol (ERP)


   This document updates the Internet Key Exchange Protocol version 2
   (IKEv2) described in RFC 5996.  This extension allows an IKE Security
   Association (SA) to be created and authenticated using the Extensible
   Authentication Protocol (EAP) Re-authentication Protocol extension,
   as described in RFC 6696.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see 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

Nir & Wu                      Experimental                      [Page 1]
RFC 6867                       ERP for IKE                  January 2013

Copyright Notice

   Copyright (c) 2013 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
   ( 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.

1.  Introduction

   IKEv2, as specified in [RFC5996], allows (Section 2.16)
   authentication of the initiator using an EAP method.  Using EAP
   significantly increases the count of round trips required to
   establish the IPsec SA and also may require user interaction.  This
   makes it inconvenient to allow a single remote access client to
   create multiple IPsec tunnels with multiple IPsec gateways that
   belong to the same domain.

   The EAP Re-authentication Protocol (ERP), as described in [RFC6696],
   allows an EAP peer to authenticate to multiple authenticators while
   performing the full EAP method only once.  Subsequent authentications
   require fewer round trips and no user interaction.

   Bringing these two technologies together allows a remote access IPsec
   client to create multiple tunnels with different gateways that belong
   to a single domain as well as using the keys from other contexts of
   using EAP, such as network access within the same domain, to
   transparently connect to VPN gateways within this domain.

   Additionally, it allows for faster set up of new tunnels when
   previous tunnels have been torn down due to things like network
   outage, device suspension, or a temporary move out of range.  This is
   similar to the session resumption mechanism described in [RFC5723].
   One exception being that instead of a ticket stored by the client,
   the re-authentication Master Session Key (rMSK) (see Section 4.6 of
   [RFC6696]) is used as the session key stored on both the client and
   the Authentication, Authorization, and Accounting (AAA) server.

Nir & Wu                      Experimental                      [Page 2]
RFC 6867                       ERP for IKE                  January 2013

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

2.  Usage Scenarios

   This work is motivated by the following scenarios:

   o  Multiple tunnels for a single remote access VPN client.  Suppose a
      company has offices in New York City, Paris, and Shanghai.  For
      historical reasons, the email server is located in the Paris
      office, most of the servers hosting the company's intranet are
      located in Shanghai, and the finance department servers are in New
      York City.  An employee using a remote access VPN may need to
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