Network Working Group
Request for Comments: 4672
Category: Informational

S. De Cnodder
Alcatel
N. Jonnala
M. Chiba
Cisco Systems, Inc.
September 2006

RADIUS Dynamic Authorization Client MIB

Status of This Memo

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Copyright Notice

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes the Remote Authentication Dial-In User Service (RADIUS) (RFC2865) Dynamic Authorization Client (DAC) functions that support the dynamic authorization extensions as defined in RFC 3576.

   1. Introduction ....................................................2
      1.1. Requirements Notation ......................................2
      1.2. Terminology ................................................2
   2. The Internet-Standard Management Framework ......................3
   3. Overview ........................................................3
   4. RADIUS Dynamic Authorization Client MIB Definitions .............3
   5. Security Considerations ........................................19
   6. IANA Considerations ............................................20
   7. Acknowledgements ...............................................20
   8. References .....................................................21
      8.1. Normative References ......................................21
      8.2. Informative References ....................................21

1. Introduction

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes the Remote Authentication Dial-In User Service (RADIUS) [RFC2865] Dynamic Authorization Client (DAC) functions that support the dynamic authorization extensions as defined in RFC 3576.

It is becoming increasingly important to support Dynamic Authorization extensions on the network access server (NAS) devices to handle the Disconnect and Change-of-Authorization (CoA) messages, as described in [RFC3576]. As a result, the effective management of RADIUS Dynamic Authorization entities is of considerable importance. This RADIUS Dynamic Authorization Client MIB complements the managed objects used for managing RADIUS authentication and accounting servers, as described in [RFC4669] and [RFC4671], respectively.

1.1. Requirements Notation

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

1.2. Terminology

Dynamic Authorization Server (DAS)

The component that resides on the NAS that processes the Disconnect and Change-of-Authorization (CoA) Request packets [RFC3576] sent by the Dynamic Authorization Client.

Dynamic Authorization Client (DAC)

The component that sends Disconnect and CoA-Request packets to the Dynamic Authorization Server. Although this component often resides on the RADIUS server, it is also possible for this component to be located on a separate host, such as a Rating Engine.

Dynamic Authorization Server Port

The UDP port on which the Dynamic Authorization Server listens for the Disconnect and CoA requests sent by the Dynamic Authorization Client.

2. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of [RFC3410].

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579], and STD 58, RFC 2580 [RFC2580].

3. Overview

"Dynamic Authorization Extensions to RADIUS" [RFC3576] defines the operation of Disconnect-Request, Disconnect-ACK, Disconnect-NAK, CoA-Request, CoA-ACK, and CoA-NAK packets. [RFC4673] defines the Dynamic Authorization Server MIB and the relationship with other MIB modules. This MIB module for the Dynamic Authorization Client contains the following:

Two scalar objects

One Dynamic Authorization Server table. This table contains one row for each DAS with which the DAC shares a secret.

4. RADIUS Dynamic Authorization Client MIB Definitions

   RADIUS-DYNAUTH-CLIENT-MIB DEFINITIONS ::= BEGIN

IMPORTS

          MODULE-IDENTITY, OBJECT-TYPE,
          Counter32, Gauge32, Integer32,
          mib-2, TimeTicks    FROM SNMPv2-SMI         -- [RFC2578]
          SnmpAdminString     FROM SNMP-FRAMEWORK-MIB -- [RFC3411]
          InetAddressType, InetAddress,
          InetPortNumber      FROM INET-ADDRESS-MIB   -- [RFC4001]
          MODULE-COMPLIANCE,
          OBJECT-GROUP        FROM SNMPv2-CONF;       -- [RFC2580]

radiusDynAuthClientMIB MODULE-IDENTITY

          LAST-UPDATED "200608290000Z" -- 29 August 2006
          ORGANIZATION "IETF RADEXT Working Group"
          CONTACT-INFO
          
                 " Stefaan De Cnodder

Alcatel
Francis Wellesplein 1
B-2018 Antwerp
Belgium

                   Phone: +32 3 240 85 15
                   EMail: [email protected]

Nagi Reddy Jonnala
Cisco Systems, Inc.
Divyasree Chambers, B Wing,
O'Shaugnessy Road,
Bangalore-560027, India.

                   Phone: +91 94487 60828
                   EMail: [email protected]

Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134

                   Phone: +1 408 525 7198
                   EMail: [email protected] "
          DESCRIPTION
              "The MIB module for entities implementing the client
               side of the Dynamic Authorization Extensions to the
               Remote Authentication Dial-In User Service (RADIUS)
               protocol. Copyright © The Internet Society (2006).
               Initial version as published in RFC 4672;
               for full legal notices see the RFC itself."
          
          REVISION "200609290000Z" -- 29 August 2006
          DESCRIPTION "Initial version as published in RFC 4672"
          ::= { mib-2 145 }

radiusDynAuthClientMIBObjects OBJECT IDENTIFIER ::=

{ radiusDynAuthClientMIB 1 }

   radiusDynAuthClientScalars    OBJECT IDENTIFIER ::=
                                  { radiusDynAuthClientMIBObjects 1 }

radiusDynAuthClientDisconInvalidServerAddresses OBJECT-TYPE

SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION

"The number of Disconnect-Ack and Disconnect-NAK packets

                 received from unknown addresses.  This counter may
                 experience a discontinuity when the DAC module
                 (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          ::= { radiusDynAuthClientScalars 1 }

radiusDynAuthClientCoAInvalidServerAddresses OBJECT-TYPE

          SYNTAX Counter32
          MAX-ACCESS read-only
          STATUS current
          DESCRIPTION
                "The number of CoA-Ack and CoA-NAK packets received from
                 unknown addresses.  Disconnect-NAK packets received
                 from unknown addresses.  This counter may experience a
                 discontinuity when the DAC module (re)starts, as
                 indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          ::= { radiusDynAuthClientScalars 2 }

radiusDynAuthServerTable OBJECT-TYPE

          SYNTAX SEQUENCE OF RadiusDynAuthServerEntry
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
                "The (conceptual) table listing the RADIUS Dynamic
                 Authorization Servers with which the client shares a
                 secret."
          ::= { radiusDynAuthClientMIBObjects 2 }

radiusDynAuthServerEntry OBJECT-TYPE

          SYNTAX     RadiusDynAuthServerEntry
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
                "An entry (conceptual row) representing one Dynamic
                 Authorization Server with which the client shares a
                 secret."
          INDEX      { radiusDynAuthServerIndex }
          ::= { radiusDynAuthServerTable 1 }

RadiusDynAuthServerEntry ::= SEQUENCE {

          radiusDynAuthServerIndex                     Integer32,
          radiusDynAuthServerAddressType               InetAddressType,
          radiusDynAuthServerAddress                   InetAddress,
          radiusDynAuthServerClientPortNumber          InetPortNumber,
          radiusDynAuthServerID                        SnmpAdminString,
          radiusDynAuthClientRoundTripTime             TimeTicks,
          radiusDynAuthClientDisconRequests            Counter32,
   
          radiusDynAuthClientDisconAuthOnlyRequests    Counter32,
          radiusDynAuthClientDisconRetransmissions     Counter32,
          radiusDynAuthClientDisconAcks                Counter32,
          radiusDynAuthClientDisconNaks                Counter32,
          radiusDynAuthClientDisconNakAuthOnlyRequest  Counter32,
          radiusDynAuthClientDisconNakSessNoContext    Counter32,
          radiusDynAuthClientMalformedDisconResponses  Counter32,
          radiusDynAuthClientDisconBadAuthenticators   Counter32,
          radiusDynAuthClientDisconPendingRequests     Gauge32,
          radiusDynAuthClientDisconTimeouts            Counter32,
          radiusDynAuthClientDisconPacketsDropped      Counter32,
          radiusDynAuthClientCoARequests               Counter32,
          radiusDynAuthClientCoAAuthOnlyRequest        Counter32,
          radiusDynAuthClientCoARetransmissions        Counter32,
          radiusDynAuthClientCoAAcks                   Counter32,
          radiusDynAuthClientCoANaks                   Counter32,
          radiusDynAuthClientCoANakAuthOnlyRequest     Counter32,
          radiusDynAuthClientCoANakSessNoContext       Counter32,
          radiusDynAuthClientMalformedCoAResponses     Counter32,
          radiusDynAuthClientCoABadAuthenticators      Counter32,
          radiusDynAuthClientCoAPendingRequests        Gauge32,
          radiusDynAuthClientCoATimeouts               Counter32,
          radiusDynAuthClientCoAPacketsDropped         Counter32,
          radiusDynAuthClientUnknownTypes              Counter32,
          radiusDynAuthClientCounterDiscontinuity      TimeTicks
   }

radiusDynAuthServerIndex OBJECT-TYPE

          SYNTAX     Integer32 (1..2147483647)
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
                "A number uniquely identifying each RADIUS Dynamic
                 Authorization Server with which this Dynamic
                 Authorization Client communicates.  This number is
                 allocated by the agent implementing this MIB module
                 and is unique in this context."
          ::= { radiusDynAuthServerEntry 1 }

radiusDynAuthServerAddressType OBJECT-TYPE

          SYNTAX     InetAddressType
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The type of IP address of the RADIUS Dynamic
                 Authorization Server referred to in this table entry."
          ::= { radiusDynAuthServerEntry 2 }

radiusDynAuthServerAddress OBJECT-TYPE

          SYNTAX     InetAddress
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The IP address value of the RADIUS Dynamic
                 Authorization Server referred to in this table entry
                 using the version neutral IP address format.  The type
                 of this address is determined by the value of the
                 radiusDynAuthServerAddressType object."
          ::= { radiusDynAuthServerEntry 3 }

radiusDynAuthServerClientPortNumber OBJECT-TYPE

          SYNTAX     InetPortNumber (1..65535)
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The UDP destination port that the RADIUS Dynamic
                 Authorization Client is using to send requests to this
                 server.  The value zero is invalid."
          ::= { radiusDynAuthServerEntry 4 }

radiusDynAuthServerID OBJECT-TYPE

          SYNTAX     SnmpAdminString
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The NAS-Identifier of the RADIUS Dynamic Authorization
                 Server referred to in this table entry.  This is not
                 necessarily the same as sysName in MIB II."
          REFERENCE
                "RFC 2865, Section 5.32, NAS-Identifier."
          ::= { radiusDynAuthServerEntry 5 }

radiusDynAuthClientRoundTripTime OBJECT-TYPE

          SYNTAX     TimeTicks
          UNITS      "hundredths of a second"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The time interval (in hundredths of a second) between
                 the most recent Disconnect or CoA request and the
                 receipt of the corresponding Disconnect or CoA reply.
                 A value of zero is returned if no reply has been
                 received yet from this server."
          ::= { radiusDynAuthServerEntry 6 }

radiusDynAuthClientDisconRequests OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-Requests sent
                 to this Dynamic Authorization Server.  This also
                 includes the RADIUS Disconnect-Requests that have a
                 Service-Type attribute with value 'Authorize Only'.
                 Disconnect-NAK packets received from unknown addresses.
                 This counter may experience a discontinuity when the
                 DAC module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 7 }

radiusDynAuthClientDisconAuthOnlyRequests OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-Requests that include a
                 Service-Type attribute with value 'Authorize Only'
                 sent to this Dynamic Authorization Server.
                 Disconnect-NAK packets received from unknown addresses.
                 This counter may experience a discontinuity when the
                 DAC module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 8 }

radiusDynAuthClientDisconRetransmissions OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "retransmissions"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-request packets
                 retransmitted to this RADIUS Dynamic Authorization
                 Server.  Disconnect-NAK packets received from unknown
                 addresses.  This counter may experience a discontinuity
                 when the DAC module (re)starts, as indicated by the
                 value of radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 9 }
   
   radiusDynAuthClientDisconAcks  OBJECT-TYPE
          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-ACK packets
                 received from this Dynamic Authorization Server.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 10 }

radiusDynAuthClientDisconNaks OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-NAK packets
                 received from this Dynamic Authorization Server.
                 This includes the RADIUS Disconnect-NAK packets
                 received with a Service-Type attribute with value
                 'Authorize Only' and the RADIUS Disconnect-NAK
                 packets received if no session context was found.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 11 }

radiusDynAuthClientDisconNakAuthOnlyRequest OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-NAK packets
                 that include a Service-Type attribute with value
                 'Authorize Only' received from this Dynamic
                 Authorization Server.  This counter may experience a
                 discontinuity when the DAC module (re)starts, as
          
                 indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 12 }

radiusDynAuthClientDisconNakSessNoContext OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-NAK packets
                 received from this Dynamic Authorization Server
                 because no session context was found; i.e., it
                 includes an Error-Cause attribute with value 503
                 ('Session Context Not Found').  This counter may
                 experience a discontinuity when the DAC module
                 (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 13 }

radiusDynAuthClientMalformedDisconResponses OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of malformed RADIUS Disconnect-Ack and
                 Disconnect-NAK packets received from this Dynamic
                 Authorization Server.  Bad authenticators and unknown
                 types are not included as malformed Disconnect-Ack and
                 Disconnect-NAK packets.  This counter may experience a
                 discontinuity when the DAC module (re)starts, as
                 indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM), and
                 Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 14 }

radiusDynAuthClientDisconBadAuthenticators OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-Ack and Disconnect-NAK
                 packets that contained invalid Authenticator field
                 received from this Dynamic Authorization Server.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM), and
                 Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 15 }

radiusDynAuthClientDisconPendingRequests OBJECT-TYPE

          SYNTAX     Gauge32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS Disconnect-request packets
                 destined for this server that have not yet timed out
                 or received a response.  This variable is incremented
                 when an Disconnect-Request is sent and decremented
                 due to receipt of a Disconnect-Ack, a Disconnect-NAK,
                 a timeout, or a retransmission."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 16 }

radiusDynAuthClientDisconTimeouts OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "timeouts"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of Disconnect request timeouts to this
                 server.  After a timeout, the client may retry to the
                 same server or give up.  A retry to the same server is
                 counted as a retransmit and as a timeout.  A send
                 to a different server is counted as a
                 Disconnect-Request and as a timeout.  This counter
                 may experience a discontinuity when the DAC module
                 (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM)."
          ::= { radiusDynAuthServerEntry 17 }
   
   radiusDynAuthClientDisconPacketsDropped OBJECT-TYPE
          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of incoming Disconnect-Ack and
                 Disconnect-NAK packets from this Dynamic Authorization
                 Server silently discarded by the client application for
                 some reason other than malformed, bad authenticators,
                 or unknown types.  This counter may experience a
                 discontinuity when the DAC module (re)starts, as
                 indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.1, Disconnect Messages (DM), and
                 Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 18 }

radiusDynAuthClientCoARequests OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-Requests sent to this
                 Dynamic Authorization Server.  This also includes
                 CoA requests that have a Service-Type attribute
                 with value 'Authorize Only'.  This counter may
                 experience a discontinuity when the DAC module
                 (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 19 }

radiusDynAuthClientCoAAuthOnlyRequest OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-requests that include a
                 Service-Type attribute with value 'Authorize Only'
                 sent to this Dynamic Authorization Client.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 20 }

radiusDynAuthClientCoARetransmissions OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "retransmissions"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-request packets
                 retransmitted to this RADIUS Dynamic Authorization
                 Server.  This counter may experience a discontinuity
                 when the DAC module (re)starts, as indicated by the
                 value of radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 21 }
   
   radiusDynAuthClientCoAAcks  OBJECT-TYPE
          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-ACK packets received from
                 this Dynamic Authorization Server.  This counter may
                 experience a discontinuity when the DAC module
                 (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 22 }

radiusDynAuthClientCoANaks OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-NAK packets received from
                 this Dynamic Authorization Server.  This includes the
                 RADIUS CoA-NAK packets received with a Service-Type
                 attribute with value 'Authorize Only' and the RADIUS
                 CoA-NAK packets received because no session context
          
                 was found.  This counter may experience a discontinuity
                 when the DAC module (re)starts, as indicated by the
                 value of radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 23 }

radiusDynAuthClientCoANakAuthOnlyRequest OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-NAK packets that include a
                 Service-Type attribute with value 'Authorize Only'
                 received from this Dynamic Authorization Server.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 24 }

radiusDynAuthClientCoANakSessNoContext OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-NAK packets received from
                 this Dynamic Authorization Server because no session
                 context was found; i.e., it includes an Error-Cause
                 attribute with value 503 ('Session Context Not Found').
                 This counter may experience a discontinuity when the
                 DAC module (re)starts as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 25 }

radiusDynAuthClientMalformedCoAResponses OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of malformed RADIUS CoA-Ack and CoA-NAK
                 packets received from this Dynamic Authorization
                 Server.  Bad authenticators and unknown types are
                 not included as malformed CoA-Ack and CoA-NAK packets.
                 This counter may experience a discontinuity when the
                 DAC module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA), and Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 26 }

radiusDynAuthClientCoABadAuthenticators OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-Ack and CoA-NAK packets
                 that contained invalid Authenticator field
                 received from this Dynamic Authorization Server.
                 This counter may experience a discontinuity when the
                 DAC module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA), and Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 27 }

radiusDynAuthClientCoAPendingRequests OBJECT-TYPE

          SYNTAX     Gauge32
          UNITS      "requests"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of RADIUS CoA-request packets destined for
                 this server that have not yet timed out or received a
                 response.  This variable is incremented when an
                 CoA-Request is sent and decremented due to receipt of
                 a CoA-Ack, a CoA-NAK, or a timeout, or a
                 retransmission."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 28 }
   
   radiusDynAuthClientCoATimeouts OBJECT-TYPE
          SYNTAX     Counter32
          UNITS      "timeouts"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of CoA request timeouts to this server.
                 After a timeout, the client may retry to the same
                 server or give up.  A retry to the same server is
                 counted as a retransmit and as a timeout.  A send to
                 a different server is counted as a CoA-Request and
                 as a timeout.  This counter may experience a
                 discontinuity when the DAC module (re)starts, as
                 indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA)."
          ::= { radiusDynAuthServerEntry 29 }

radiusDynAuthClientCoAPacketsDropped OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of incoming CoA-Ack and CoA-NAK from this
                 Dynamic Authorization Server silently discarded by the
                 client application for some reason other than
                 malformed, bad authenticators, or unknown types.  This
                 counter may experience a discontinuity when the DAC
                 module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          REFERENCE
                "RFC 3576, Section 2.2, Change-of-Authorization
                 Messages (CoA), and Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 30 }

radiusDynAuthClientUnknownTypes OBJECT-TYPE

          SYNTAX     Counter32
          UNITS      "replies"
          MAX-ACCESS read-only
          STATUS     current
          DESCRIPTION
                "The number of incoming packets of unknown types
                 that were received on the Dynamic Authorization port.
                 This counter may experience a discontinuity when the
                 DAC module (re)starts, as indicated by the value of
                 radiusDynAuthClientCounterDiscontinuity."
          
          REFERENCE
                "RFC 3576, Section 2.3, Packet Format."
          ::= { radiusDynAuthServerEntry 31 }

radiusDynAuthClientCounterDiscontinuity OBJECT-TYPE

          SYNTAX TimeTicks
          UNITS  "hundredths of a second"
          MAX-ACCESS read-only
          STATUS current
          DESCRIPTION
                "The time (in hundredths of a second) since the
                 last counter discontinuity.  A discontinuity may
                 be the result of a reinitialization of the DAC
                 module within the managed entity."
          ::= { radiusDynAuthServerEntry 32 }
   
   -- conformance information
   
   radiusDynAuthClientMIBConformance
          OBJECT IDENTIFIER ::= { radiusDynAuthClientMIB 2 }
   radiusDynAuthClientMIBCompliances
          OBJECT IDENTIFIER ::= { radiusDynAuthClientMIBConformance 1 }
   radiusDynAuthClientMIBGroups
          OBJECT IDENTIFIER ::= { radiusDynAuthClientMIBConformance 2 }
   -- compliance statements

radiusDynAuthClientMIBCompliance MODULE-COMPLIANCE

          STATUS  current
          DESCRIPTION
                "The compliance statement for entities implementing
                 the RADIUS Dynamic Authorization Client.
                 Implementation of this module is for entities that
                 support IPv4 and/or IPv6."
          MODULE  -- this module
          MANDATORY-GROUPS { radiusDynAuthClientMIBGroup }
          
          OBJECT             radiusDynAuthServerAddressType
          SYNTAX             InetAddressType { ipv4(1), ipv6(2) }
          DESCRIPTION
              "An implementation is only required to support IPv4 and
               globally unique IPv6 addresses."
          
          OBJECT             radiusDynAuthServerAddress
          SYNTAX             InetAddress (SIZE(4|16))
          DESCRIPTION
              "An implementation is only required to support IPv4 and
               globally unique IPv6 addresses."
          
          GROUP              radiusDynAuthClientAuthOnlyGroup
          DESCRIPTION
                "Only required for Dynamic Authorization Clients that
                 are supporting Service-Type attributes with value
                 'Authorize-Only'."
          
          GROUP              radiusDynAuthClientNoSessGroup
          DESCRIPTION
                "This group is not required if the Dynamic
                 Authorization Server cannot easily determine whether
                 a session exists (e.g., in case of a RADIUS
                 proxy)."
          
          ::= { radiusDynAuthClientMIBCompliances 1 }

-- units of conformance

radiusDynAuthClientMIBGroup OBJECT-GROUP

          OBJECTS { radiusDynAuthClientDisconInvalidServerAddresses,
                    radiusDynAuthClientCoAInvalidServerAddresses,
                    radiusDynAuthServerAddressType,
                    radiusDynAuthServerAddress,
                    radiusDynAuthServerClientPortNumber,
                    radiusDynAuthServerID,
                    radiusDynAuthClientRoundTripTime,
                    radiusDynAuthClientDisconRequests,
                    radiusDynAuthClientDisconRetransmissions,
                    radiusDynAuthClientDisconAcks,
                    radiusDynAuthClientDisconNaks,
                    radiusDynAuthClientMalformedDisconResponses,
                    radiusDynAuthClientDisconBadAuthenticators,
                    radiusDynAuthClientDisconPendingRequests,
                    radiusDynAuthClientDisconTimeouts,
                    radiusDynAuthClientDisconPacketsDropped,
                    radiusDynAuthClientCoARequests,
                    radiusDynAuthClientCoARetransmissions,
                    radiusDynAuthClientCoAAcks,
                    radiusDynAuthClientCoANaks,
                    radiusDynAuthClientMalformedCoAResponses,
                    radiusDynAuthClientCoABadAuthenticators,
                    radiusDynAuthClientCoAPendingRequests,
                    radiusDynAuthClientCoATimeouts,
                    radiusDynAuthClientCoAPacketsDropped,
                    radiusDynAuthClientUnknownTypes,
                    radiusDynAuthClientCounterDiscontinuity
                  }
          STATUS  current
          DESCRIPTION
                "The collection of objects providing management of
                 a RADIUS Dynamic Authorization Client."
          ::= { radiusDynAuthClientMIBGroups 1 }

radiusDynAuthClientAuthOnlyGroup OBJECT-GROUP

          OBJECTS { radiusDynAuthClientDisconAuthOnlyRequests,
                    radiusDynAuthClientDisconNakAuthOnlyRequest,
                    radiusDynAuthClientCoAAuthOnlyRequest,
                    radiusDynAuthClientCoANakAuthOnlyRequest
                  }
          STATUS  current
          DESCRIPTION
                "The collection of objects supporting the RADIUS
                 messages including Service-Type attribute with
                 value 'Authorize Only'."
          ::= { radiusDynAuthClientMIBGroups 2 }

radiusDynAuthClientNoSessGroup OBJECT-GROUP

          OBJECTS { radiusDynAuthClientDisconNakSessNoContext,
                    radiusDynAuthClientCoANakSessNoContext
                  }
          STATUS  current
          DESCRIPTION
                "The collection of objects supporting the RADIUS
                 messages that are referring to non-existing sessions."
          ::= { radiusDynAuthClientMIBGroups 3 }
   
   END

5. Security Considerations

There are no management objects defined in this MIB module that have a MAX-ACCESS clause of read-write and/or read-create. So, if this MIB module is implemented correctly, then there is no risk that an intruder can alter or create any management objects of this MIB module via direct SNMP SET operations.

Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability:

   radiusDynAuthServerAddress and radiusDynAuthServerAddressType

These can be used to determine the address of the DAS with which the DAC is communicating. This information could be useful in mounting an attack on the DAS.

   radiusDynAuthServerID

This can be used to determine the Identifier of the DAS. This information could be useful in impersonating the DAS.

   radiusDynAuthServerClientPortNumber

This can be used to determine the destination port number to which the DAC is sending. This information could be useful in mounting an attack on the DAS.

SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.

It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).

Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.

6. IANA Considerations

The IANA has assigned OID number 145 under mib-2.

7. Acknowledgements

The authors would also like to acknowledge the following people for their comments on this document: Bernard Aboba, Alan DeKok, David Nelson, Anjaneyulu Pata, Dan Romascanu, Juergen Schoenwaelder, Greg Weber, Bert Wijnen, and Glen Zorn.

8. References

8.1. Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.
   
   [RFC2578]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Structure of Management Information Version 2 (SMIv2)",
              STD 58, RFC 2578, April 1999.
   
   [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Textual Conventions for SMIv2", STD 58, RFC 2579, April
              1999.
   
   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.
   
   [RFC3411]  Harrington, D., Presuhn, R., and B. Wijnen, "An
              Architecture for Describing Simple Network Management
              Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
              December 2002.
   
   [RFC3576]  Chiba, M., Dommety, G., Eklund, M., Mitton, D., and B.
              Aboba, "Dynamic Authorization Extensions to Remote
              Authentication Dial In User Service (RADIUS)", RFC 3576,
              July 2003.
   
   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network
              Addresses", RFC 4001, February 2005.

8.2. Informative References

   [RFC2865]  Rigney, C., Willens, S., Rubens, A., and W. Simpson,
              "Remote Authentication Dial In User Service (RADIUS)", RFC
              2865, June 2000.
   
   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.
   
   [RFC4669]  Nelson, D., "RADIUS Authentication Server MIB for IPv6",
              RFC 4669, August 2006.
   
   [RFC4671]  Nelson, D., "RADIUS Accounting Server MIB for IPv6", RFC
              4671, August 2006.
   
   [RFC4673]  De Cnodder, S., Jonnala, N., and M. Chiba, "RADIUS Dynamic
              Authorization Server MIB", RFC 4673, September 2006.

Authors' Addresses

Stefaan De Cnodder
Alcatel
Francis Wellesplein 1
B-2018 Antwerp
Belgium

   Phone: +32 3 240 85 15
   EMail: [email protected]

Nagi Reddy Jonnala
Cisco Systems, Inc.
Divyasree Chambers, B Wing, O'Shaugnessy Road Bangalore-560027, India

   Phone: +91 94487 60828
   EMail: [email protected]

Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134

   Phone: +1 408 525 7198
   EMail: [email protected]

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