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AAA Working Group                                       David Mariblanca
INTERNET-DRAFT                                                  Ericsson
Expires: November 2004

                                                               May, 2004


               EAP lower layer attributes for AAA protocols
                  <draft-mariblanca-aaa-eap-lla-00.txt>


Status of this memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that other
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   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 cite them other than as "work in progress".

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/lid-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This document is an individual submission to the IETF. Comments
   should be directed to the authors.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document defines a new AVP to be transported in RADIUS or
   Diameter when EAP is carried over these protocols. The purpose of
   this AVP is to determine which layer 2 protocol was used to
   encapsulate the EAP messages at the point they were initiated.



TABLE OF CONTENTS

1.  Introduction.......................................................3



Mariblanca                                                      [Page 1]

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1.1  Abbreviations....................................................3
2.  Conventions........................................................3
3.  Attributes.........................................................3
3.1 EAP-Lower-Layer AVP................................................3
4.  Acknowledgements...................................................5
5.  Authors' Addresses.................................................5
6.  References.........................................................5















































Mariblanca                                                      [Page 2]

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1. Introduction

   This document defines a new AVP to be transported in RADIUS or
   Diameter when EAP [EAP] is carried over these protocols. This
   information will be useful for the EAP server to determine which
   service initiated the EAP procedure. This situation will be common
   when EAP is used over a layer 2 protocol for which the EAP server is
   not one of the termination points. The access node where EAP is
   decapsulated from such layer 2 protocol will package the EAP messages
   over RADIUS [RFC3579] or Diameter [DEAPapp] and send them to the EAP
   server, which in some situations will need to have some information
   about the origin of the EAP messages. For example, the EAP server may
   wish to allow/deny access from a given lower layer for every
   subscriber. The AVP defined in this document will provide this
   information to the EAP server. The EAP server MAY use this AVP at the
   moment of the authorization decision, and once this decision is
   taken, the rest of the exchange SHOULD NOT be affected.



1.1  Abbreviations

   EAP    Extensible Authentication Protocol

2. Conventions

   The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL, when
   they appear in this document, are to be interpreted as described in
   [RFC2119].


3. Attributes

3.1 EAP-Lower-Layer AVP

   The EAP-Lower-Layer AVP indicates the layer 2 protocol which has been
   used to carry EAP messages. This attribute MAY be used by access
   devices acting as EAP pass-through authenticators, such as network
   access servers passing EAP from a PPP interface to a RADIUS or
   DIAMETER interface.
   This AVP MAY be included in the Diameter-EAP-Request (DER) Command.
   It MUST NOT be present in the Diameter-EAP-Answer (DEA) Command.
   In case of RADIUS, the EAP-Lower-Layer AVP MAY be included in the
   Access-Request message, and MUST NOT be included in any other RADIUS
   message.

   The format of the EAP-Lower-Layer AVP is shown below.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1



Mariblanca                                                      [Page 3]

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      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |EAP-Lower-Layer| Length = 1    |    Underlying Protocol        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The values for this attribute are:

          Protocol                 Value
          PPP                      1
          802.1X                   2
          IKEv2                    3
          PANA                     4











































Mariblanca                                                      [Page 4]

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4. Acknowledgements

   The author would like to thank Hannes Tschofenig, Bernard Aboba and
   Jari Arkko for their help in the creation and edition of this
   document.


5. Authors' Addresses

   David Mariblanca
   Ericsson Espana S.A.
   Via de los Poblados 13
   28033 Madrid
   Spain

   Phone: +34-91-339-3422
   Email: david.mariblanca@ericsson.com



6. References

   [EAP]       Blunk, L., Vollbrecht, J., Aboba, B., Carlson, J. and H.
               Levkowetz, "Extensible Authentication Protocol (EAP)",
               draft-ietf-eap-rfc2284bis-09 (work in progress), February
               2004.

   [DEAPapp]  P. Eronen, T. Hiller, G. Zorn, “Diameter Extensible
               Authentication Protocol (EAP) Application”, draft-ietf-
               aaa-eap-05.txt (work in progress), April 2004.

   [RFC3579]  B. Aboba, P. Calhoun, “RADIUS (Remote Authentication Dial
               In User Service) Support For Extensible Authentication
               Protocol (EAP)“, RFC 3579, September 2003




















Mariblanca                                                      [Page 5]

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Full Copyright Statement

   Copyright (C) The Internet Society (2004). All Rights Reserved.

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   Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.






















Mariblanca                                                      [Page 6]


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