Support of Fragmentation of RADIUS Packets
RFC 7499
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
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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
11.2. Updated Proxies ..........................................29
12. General Considerations ........................................31
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