Support of Fragmentation of RADIUS Packets
RFC 7499

Document Type RFC - Experimental (April 2015; No errata)
Last updated 2015-10-14
Replaces draft-perez-radext-radius-fragmentation
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Stefan Winter
Shepherd write-up Show (last changed 2014-11-27)
IESG IESG state RFC 7499 (Experimental)
Consensus Boilerplate Yes
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Responsible AD Benoit Claise
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)              A. Perez-Mendez, Ed.
Request for Comments: 7499                                R. Marin-Lopez
Category: Experimental                              F. Pereniguez-Garcia
ISSN: 2070-1721                                          G. Lopez-Millan
                                                    University of Murcia
                                                                D. Lopez
                                                          Telefonica I+D
                                                                A. DeKok
                                                          Network RADIUS
                                                              April 2015

               Support of Fragmentation of RADIUS Packets

Abstract

   The Remote Authentication Dial-In User Service (RADIUS) protocol is
   limited to a total packet size of 4096 bytes.  Provisions exist for
   fragmenting large amounts of authentication data across multiple
   packets, via Access-Challenge packets.  No similar provisions exist
   for fragmenting large amounts of authorization data.  This document
   specifies how existing RADIUS mechanisms can be leveraged to provide
   that functionality.  These mechanisms are largely compatible with
   existing implementations, and they are designed to be invisible to
   proxies and "fail-safe" to legacy RADIUS Clients and Servers.

Status of This Memo

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

   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
   http://www.rfc-editor.org/info/rfc7499.

Perez-Mendez, et al.          Experimental                      [Page 1]
RFC 7499             Fragmentation of RADIUS Packets          April 2015

Copyright Notice

   Copyright (c) 2015 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.

Perez-Mendez, et al.          Experimental                      [Page 2]
RFC 7499             Fragmentation of RADIUS Packets          April 2015

Table of Contents

   1. Introduction ....................................................4
      1.1. Requirements Language ......................................6
   2. Status of This Document .........................................6
   3. Scope of This Document ..........................................7
   4. Overview .......................................................10
   5. Fragmentation of Packets .......................................13
      5.1. Pre-Authorization .........................................14
      5.2. Post-Authorization ........................................18
   6. Chunk Size .....................................................21
   7. Allowed Large Packet Size ......................................22
   8. Handling Special Attributes ....................................23
      8.1. Proxy-State Attribute .....................................23
      8.2. State Attribute ...........................................24
      8.3. Service-Type Attribute ....................................25
      8.4. Rebuilding the Original Large Packet ......................25
   9. New T Flag for the Long Extended Type Attribute Definition .....26
   10. New Attribute Definition ......................................26
      10.1. Frag-Status Attribute ....................................27
      10.2. Proxy-State-Length Attribute .............................28
      10.3. Table of Attributes ......................................29
   11. Operation with Proxies ........................................29
      11.1. Legacy Proxies ...........................................29
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