RADIUS over TCP
RFC 6613
| Document | Type |
RFC - Experimental
(May 2012; No errata)
Updated by RFC 7930
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-dekok-radext-tcp-transport | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6613 (Experimental) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Benoit Claise | ||
| IESG note | Bernard Aboba (bernard_aboba@hotmail.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) A. DeKok
Request for Comments: 6613 FreeRADIUS
Category: Experimental May 2012
ISSN: 2070-1721
RADIUS over TCP
Abstract
The Remote Authentication Dial-In User Server (RADIUS) protocol has,
until now, required the User Datagram Protocol (UDP) as the
underlying transport layer. This document defines RADIUS over the
Transmission Control Protocol (RADIUS/TCP), in order to address
handling issues related to RADIUS over Transport Layer Security
(RADIUS/TLS). It permits TCP to be used as a transport protocol for
RADIUS only when a transport layer such as TLS or IPsec provides
confidentiality and security.
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/rfc6613.
DeKok Experimental [Page 1]
RFC 6613 RADIUS over TCP May 2012
Copyright Notice
Copyright (c) 2012 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.
Table of Contents
1. Introduction ....................................................3
1.1. Applicability of Reliable Transport ........................4
1.2. Terminology ................................................6
1.3. Requirements Language ......................................6
2. Changes to RADIUS ...............................................6
2.1. Packet Format ..............................................7
2.2. Assigned Ports for RADIUS/TCP ..............................7
2.3. Management Information Base (MIB) ..........................8
2.4. Detecting Live Servers .....................................8
2.5. Congestion Control Issues ..................................9
2.6. TCP Specific Issues ........................................9
2.6.1. Duplicates and Retransmissions .....................10
2.6.2. Head of Line Blocking ..............................11
2.6.3. Shared Secrets .....................................11
2.6.4. Malformed Packets and Unknown Clients ..............12
2.6.5. Limitations of the ID Field ........................13
2.6.6. EAP Sessions .......................................13
2.6.7. TCP Applications Are Not UDP Applications ..........14
3. Diameter Considerations ........................................14
4. Security Considerations ........................................14
5. References .....................................................15
5.1. Normative References ......................................15
5.2. Informative References ....................................15
DeKok Experimental [Page 2]
RFC 6613 RADIUS over TCP May 2012
1. Introduction
The RADIUS protocol is defined in [RFC2865] as using the User
Datagram Protocol (UDP) for the underlying transport layer. While
there are a number of benefits to using UDP as outlined in [RFC2865],
Section 2.4, there are also some limitations:
* Unreliable transport. As a result, systems using RADIUS have
to implement application-layer timers and retransmissions, as
described in [RFC5080], Section 2.2.1.
* Packet fragmentation. [RFC2865], Section 3, permits RADIUS
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