Network Working Group
Request for Comments: 4670
Obsoletes: 2620
Category: Informational
D. Nelson
Enterasys Networks
August 2006

RADIUS Accounting Client MIB for IPv6

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

Copyright © The Internet Society (2006).

Abstract

This memo defines a set of extensions that instrument RADIUS accounting client functions. These extensions represent a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. Using these extensions, IP-based management stations can manage RADIUS accounting clients.

This memo obsoletes RFC 2620 by deprecating the MIB table containing IPv4-only address formats and defining a new table to add support for version-neutral IP address formats. The remaining MIB objects from RFC 2620 are carried forward into this document. This memo also adds UNITS and REFERENCE clauses to selected objects.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. The Internet-Standard Management Framework ......................3
   4. Scope of Changes ................................................3
   5. Structure of the MIB Module .....................................4
   6. Deprecated Objects ..............................................5
   7. Definitions .....................................................5
   8. Security Considerations ........................................19
   9. References .....................................................20
      9.1. Normative References ......................................20
      9.2. Informative References ....................................21
   Appendix A. Acknowledgements ......................................22

1. Introduction

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. The objects defined within this memo relate to the Remote Authentication Dial-In User Service (RADIUS) Accounting Client as defined in RFC 2866 [RFC2866].

2. Terminology

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 RFC 2119 [RFC2119].

This document uses terminology from RFC 2865 [RFC2865] and RFC 2866 [RFC2866].

This document uses the word "malformed" with respect to RADIUS packets, particularly in the context of counters of "malformed packets". While RFC 2866 does not provide an explicit definition of "malformed", malformed generally means that the implementation has determined the packet does not match the format defined in RFC 2866. Those implementations are used in deployments today, and thus set the de facto definition of "malformed".

3. 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 RFC 3410 [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].

4. Scope of Changes

This document obsoletes RFC 2620 [RFC2620], RADIUS Accounting Client MIB, by deprecating the radiusAccServerTable table and adding a new table, radiusAccServerExtTable, containing radiusAccServerInetAddressType, radiusAccServerInetAddress, and radiusAccClientServerInetPortNumber. The purpose of these added MIB objects is to support version-neutral IP addressing formats. The existing table containing radiusAuthServerAddress and radiusAuthClientServerPortNumber is deprecated. The remaining MIB objects from RFC 2620 are carried forward into this document.

RFC 4001 [RFC4001], which defines the SMI Textual Conventions for IPv6 addresses, contains the following recommendation.

'In particular, when revising a MIB module that contains IPv4 specific tables, it is suggested to define new tables using the textual conventions defined in this memo [RFC4001] that support all versions of IP. The status of the new tables SHOULD be "current", whereas the status of the old IP version specific tables SHOULD be changed to "deprecated". The other approach, of having multiple similar tables for different IP versions, is strongly discouraged.'

5. Structure of the MIB Module

The RADIUS accounting protocol, described in RFC 2866 [RFC2866], distinguishes between the client function and the server function. In RADIUS accounting, clients send Accounting-Requests, and servers reply with Accounting-Responses. Typically, Network Access Server (NAS) devices implement the client function, and thus would be expected to implement the RADIUS accounting client MIB, while RADIUS accounting servers implement the server function, and thus would be expected to implement the RADIUS accounting server MIB.

However, it is possible for a RADIUS accounting entity to perform both client and server functions. For example, a RADIUS proxy may act as a server to one or more RADIUS accounting clients, while simultaneously acting as an accounting client to one or more accounting servers. In such situations, it is expected that RADIUS entities combining client and server functionality will support both the client and server MIBs. The client MIB is defined in this document, and the server MIB is defined in [RFC4671].

This MIB module contains two scalars as well as a single table, the RADIUS Accounting Server Table, which contains one row for each RADIUS server with which the client shares a secret. Each entry in the RADIUS Accounting Server Table includes fifteen columns presenting a view of the activity of the RADIUS client.

This MIB imports from [RFC2578], [RFC2580], [RFC3411], and [RFC4001].

6. Deprecated Objects

The deprecated table in this MIB is carried forward from RFC 2620 [RFC2620]. There are two conditions under which it MAY be desirable for managed entities to continue to support the deprecated table:

  1. The managed entity only supports IPv4 address formats.
  1. The managed entity supports both IPv4 and IPv6 address formats, and the deprecated table is supported for backwards compatibility with older management stations. This option SHOULD only be used when the IP addresses in the new table are in IPv4 format and can accurately be represented in both the new table and the deprecated table.

Managed entities SHOULD NOT instantiate row entries in the deprecated table, containing IPv4-only address objects, when the RADIUS accounting server address represented in such a table row is not an IPv4 address. Managed entities SHOULD NOT return inaccurate values of IP address or SNMP object access errors for IPv4-only address objects in otherwise populated tables. When row entries exist in both the deprecated IPv4-only table and the new IP-version-neutral table that describe the same RADIUS accounting server, the row indexes SHOULD be the same for the corresponding rows in each table, to facilitate correlation of these related rows by management applications.

7. Definitions

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

IMPORTS

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

radiusAccClientMIB MODULE-IDENTITY

         LAST-UPDATED "200608210000Z" -- 21 August 2006
         ORGANIZATION "IETF RADIUS Extensions Working Group."
         CONTACT-INFO
                " Bernard Aboba
                  Microsoft
                  One Microsoft Way
         
                  Redmond, WA  98052
                  US
                  Phone: +1 425 936 6605
                  EMail: bernarda@microsoft.com"
         DESCRIPTION
               "The MIB module for entities implementing the client
                side of the Remote Authentication Dial-In User Service
                (RADIUS) accounting protocol.  Copyright © The
                Internet Society (2006).  This version of this MIB
                module is part of RFC 4670; see the RFC itself for
                full legal notices."
         REVISION "200608210000Z"  -- 21 August 2006
         DESCRIPTION
               "Revised version as published in RFC 4670.
                This version obsoletes that of RFC 2620 by
                deprecating the MIB table containing IPv4-only
                address formats and defining a new table to add support
                for version-neutral IP address formats.  The remaining
                MIB objects from RFC 2620 are carried forward into this
                version."
         REVISION "199906110000Z"  -- 11 Jun 1999
         DESCRIPTION "Initial version as published in RFC 2620."
         ::= { radiusAccounting 2 }

radiusMIB OBJECT-IDENTITY

         STATUS  current
         DESCRIPTION
                "The OID assigned to RADIUS MIB work by the IANA."
         ::= { mib-2 67 }
   
   radiusAccounting  OBJECT IDENTIFIER ::= {radiusMIB 2}
   
   radiusAccClientMIBObjects     OBJECT IDENTIFIER
         ::= { radiusAccClientMIB 1 }
   
   radiusAccClient  OBJECT IDENTIFIER
         ::= { radiusAccClientMIBObjects 1 }

radiusAccClientInvalidServerAddresses OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS Accounting-Response packets
                received from unknown addresses."
         ::= { radiusAccClient 1 }

radiusAccClientIdentifier OBJECT-TYPE

         SYNTAX SnmpAdminString
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The NAS-Identifier of the RADIUS accounting client.
                This is not necessarily the same as sysName in MIB
                II."
         REFERENCE "RFC 2865 section 5.32"
         ::= { radiusAccClient 2 }

radiusAccServerTable OBJECT-TYPE

         SYNTAX SEQUENCE OF RadiusAccServerEntry
         MAX-ACCESS not-accessible
         STATUS     deprecated
         DESCRIPTION
               "The (conceptual) table listing the RADIUS accounting
                servers with which the client shares a secret."
         ::= { radiusAccClient 3 }

radiusAccServerEntry OBJECT-TYPE

         SYNTAX     RadiusAccServerEntry
         MAX-ACCESS not-accessible
         STATUS     deprecated
         DESCRIPTION
               "An entry (conceptual row) representing a RADIUS
                accounting server with which the client shares a
                secret."
         INDEX      { radiusAccServerIndex }
         ::= { radiusAccServerTable 1 }
   
   RadiusAccServerEntry ::= SEQUENCE {
         radiusAccServerIndex                           Integer32,
         radiusAccServerAddress                         IpAddress,
         radiusAccClientServerPortNumber                Integer32,
         radiusAccClientRoundTripTime                   TimeTicks,
         radiusAccClientRequests                        Counter32,
         radiusAccClientRetransmissions                 Counter32,
         radiusAccClientResponses                       Counter32,
         radiusAccClientMalformedResponses              Counter32,
         radiusAccClientBadAuthenticators               Counter32,
         radiusAccClientPendingRequests                   Gauge32,
         radiusAccClientTimeouts                        Counter32,
         radiusAccClientUnknownTypes                    Counter32,
         radiusAccClientPacketsDropped                  Counter32
   }

radiusAccServerIndex OBJECT-TYPE

         SYNTAX     Integer32 (1..2147483647)
         MAX-ACCESS not-accessible
         STATUS     deprecated
         DESCRIPTION
               "A number uniquely identifying each RADIUS
                Accounting server with which this client
                communicates."
         ::= { radiusAccServerEntry 1 }

radiusAccServerAddress OBJECT-TYPE

         SYNTAX     IpAddress
         MAX-ACCESS read-only
         STATUS     deprecated
         DESCRIPTION
               "The IP address of the RADIUS accounting server
                referred to in this table entry."
         ::= { radiusAccServerEntry 2 }
   
   radiusAccClientServerPortNumber  OBJECT-TYPE
         SYNTAX Integer32 (0..65535)
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The UDP port the client is using to send requests to
                this server."
         REFERENCE "RFC 2866 section 3"
         ::= { radiusAccServerEntry 3 }
   
   radiusAccClientRoundTripTime  OBJECT-TYPE
         SYNTAX TimeTicks
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
                "The time interval between the most recent
                Accounting-Response and the Accounting-Request that
                matched it from this RADIUS accounting server."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerEntry 4 }
   
   -- Request/Response statistics
   --
   -- Requests = Responses + PendingRequests + ClientTimeouts
   --
   -- Responses - MalformedResponses - BadAuthenticators -
   -- UnknownTypes - PacketsDropped = Successfully received

radiusAccClientRequests OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS Accounting-Request packets
                sent.  This does not include retransmissions."
         REFERENCE "RFC 2866 section 4.1"
         ::= { radiusAccServerEntry 5 }

radiusAccClientRetransmissions OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS Accounting-Request packets
                retransmitted to this RADIUS accounting server.
                Retransmissions include retries where the
                Identifier and Acct-Delay have been updated, as
                well as those in which they remain the same."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerEntry 6 }

radiusAccClientResponses OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS packets received on the
                accounting port from this server."
         REFERENCE "RFC 2866 section 4.2"
         ::= { radiusAccServerEntry 7 }

radiusAccClientMalformedResponses OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
                "The number of malformed RADIUS Accounting-Response
                 packets received from this server.  Malformed packets
                include packets with an invalid length.  Bad
                authenticators and unknown types are not included as
                malformed accounting responses."
         REFERENCE "RFC 2866 section 3"
         ::= { radiusAccServerEntry 8 }

radiusAccClientBadAuthenticators OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS Accounting-Response
                packets that contained invalid authenticators
                received from this server."
         REFERENCE "RFC 2866 section 3"
         ::= { radiusAccServerEntry 9 }

radiusAccClientPendingRequests OBJECT-TYPE

         SYNTAX Gauge32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS Accounting-Request packets
                sent to this server that have not yet timed out or
                received a response.  This variable is incremented
                when an Accounting-Request is sent and decremented
                due to receipt of an Accounting-Response, a timeout,
                or a retransmission."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerEntry 10 }

radiusAccClientTimeouts OBJECT-TYPE

SYNTAX Counter32
UNITS "timeouts"
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION

             "The number of accounting timeouts to this server.
              After a timeout, the client may retry to the same
              server, send to a different server, or give up.
              A retry to the same server is counted as a
              retransmit as well as a timeout.  A send to a different
              server is counted as an Accounting-Request as well as
              a timeout."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerEntry  11 }

radiusAccClientUnknownTypes OBJECT-TYPE

SYNTAX Counter32
UNITS "packets"

         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS packets of unknown type that
                were received from this server on the accounting port."
         REFERENCE "RFC 2866 section 4"
         ::= { radiusAccServerEntry  12 }

radiusAccClientPacketsDropped OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS deprecated
         DESCRIPTION
               "The number of RADIUS packets that were received from
                this server on the accounting port and dropped for some
                other reason."
         ::= { radiusAccServerEntry  13 }

-- New MIB objects added in this revision

radiusAccServerExtTable OBJECT-TYPE

         SYNTAX SEQUENCE OF RadiusAccServerExtEntry
         MAX-ACCESS not-accessible
         STATUS     current
         DESCRIPTION
               "The (conceptual) table listing the RADIUS accounting
                servers with which the client shares a secret."
         ::= { radiusAccClient 4 }

radiusAccServerExtEntry OBJECT-TYPE

         SYNTAX     RadiusAccServerExtEntry
         MAX-ACCESS not-accessible
         STATUS     current
         DESCRIPTION
               "An entry (conceptual row) representing a RADIUS
                accounting server with which the client shares a
                secret."
         INDEX      { radiusAccServerExtIndex }
         ::= { radiusAccServerExtTable 1 }

RadiusAccServerExtEntry ::= SEQUENCE {

         radiusAccServerExtIndex                    Integer32,
         radiusAccServerInetAddressType             InetAddressType,
         radiusAccServerInetAddress                 InetAddress,
         radiusAccClientServerInetPortNumber        InetPortNumber,
         radiusAccClientExtRoundTripTime            TimeTicks,
   
         radiusAccClientExtRequests                 Counter32,
         radiusAccClientExtRetransmissions          Counter32,
         radiusAccClientExtResponses                Counter32,
         radiusAccClientExtMalformedResponses       Counter32,
         radiusAccClientExtBadAuthenticators        Counter32,
         radiusAccClientExtPendingRequests          Gauge32,
         radiusAccClientExtTimeouts                 Counter32,
         radiusAccClientExtUnknownTypes             Counter32,
         radiusAccClientExtPacketsDropped           Counter32,
         radiusAccClientCounterDiscontinuity        TimeTicks
   }

radiusAccServerExtIndex OBJECT-TYPE

         SYNTAX     Integer32 (1..2147483647)
         MAX-ACCESS not-accessible
         STATUS     current
         DESCRIPTION
               "A number uniquely identifying each RADIUS
                Accounting server with which this client
                communicates."
         ::= { radiusAccServerExtEntry 1 }

radiusAccServerInetAddressType OBJECT-TYPE

            SYNTAX     InetAddressType
            MAX-ACCESS read-only
            STATUS     current
            DESCRIPTION
                  "The type of address format used for the
                   radiusAccServerInetAddress object."
            ::= { radiusAccServerExtEntry 2 }

radiusAccServerInetAddress OBJECT-TYPE

            SYNTAX     InetAddress
            MAX-ACCESS read-only
            STATUS     current
            DESCRIPTION
                  "The IP address of the RADIUS accounting
                   server referred to in this table entry, using
                   the version-neutral IP address format."
            ::= { radiusAccServerExtEntry 3 }
      
      radiusAccClientServerInetPortNumber  OBJECT-TYPE
            SYNTAX InetPortNumber ( 1..65535 )
            MAX-ACCESS read-only
            STATUS current
            DESCRIPTION
                  "The UDP port the client is using to send requests
                   to this accounting server.  The value zero (0) is
                   invalid."
            REFERENCE "RFC 2866 section 3"
            ::= { radiusAccServerExtEntry 4 }
   
   radiusAccClientExtRoundTripTime  OBJECT-TYPE
         SYNTAX TimeTicks
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
                "The time interval between the most recent
                Accounting-Response and the Accounting-Request that
                matched it from this RADIUS accounting server."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerExtEntry 5 }
   
   -- Request/Response statistics
   --
   -- Requests = Responses + PendingRequests + ClientTimeouts
   --
   -- Responses - MalformedResponses - BadAuthenticators -
   -- UnknownTypes - PacketsDropped = Successfully received

radiusAccClientExtRequests OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS Accounting-Request packets
                sent.  This does not include retransmissions.
                This counter may experience a discontinuity when the
                RADIUS Accounting Client module within the managed
                entity is reinitialized, as indicated by the current
                value of radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 4.1"
         ::= { radiusAccServerExtEntry 6 }

radiusAccClientExtRetransmissions OBJECT-TYPE

SYNTAX Counter32
UNITS "packets"
MAX-ACCESS read-only
STATUS current
DESCRIPTION

"The number of RADIUS Accounting-Request packets

retransmitted to this RADIUS accounting server.

                Retransmissions include retries where the
                Identifier and Acct-Delay have been updated, as
                well as those in which they remain the same.
                This counter may experience a discontinuity when the
                RADIUS Accounting Client module within the managed
                entity is reinitialized, as indicated by the current
                value of radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerExtEntry 7 }

radiusAccClientExtResponses OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS packets received on the
                accounting port from this server.  This counter
                may experience a discontinuity when the RADIUS
                Accounting Client module within the managed entity is
                reinitialized, as indicated by the current value of
                radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 4.2"
         ::= { radiusAccServerExtEntry 8 }

radiusAccClientExtMalformedResponses OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of malformed RADIUS Accounting-Response
                packets received from this server.  Malformed packets
                include packets with an invalid length.  Bad
                authenticators and unknown types are not included as
                malformed accounting responses.  This counter may
                experience a discontinuity when the RADIUS Accounting
                Client module within the managed entity is
                reinitialized, as indicated by the current
                value of radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 3"
         ::= { radiusAccServerExtEntry 9 }

radiusAccClientExtBadAuthenticators OBJECT-TYPE

SYNTAX Counter32
UNITS "packets"
MAX-ACCESS read-only
STATUS current

         DESCRIPTION
               "The number of RADIUS Accounting-Response
                packets that contained invalid authenticators
                received from this server.  This counter may
                experience a discontinuity when the RADIUS
                Accounting Client module within the managed
                entity is reinitialized, as indicated by the
                current value of
                radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 3"
         ::= { radiusAccServerExtEntry 10 }

radiusAccClientExtPendingRequests OBJECT-TYPE

         SYNTAX Gauge32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS Accounting-Request packets
                sent to this server that have not yet timed out or
                received a response.  This variable is incremented
                when an Accounting-Request is sent and decremented
                due to receipt of an Accounting-Response, a timeout,
                or a retransmission.  This counter may experience a
                discontinuity when the RADIUS Accounting Client module
                within the managed entity is reinitialized, as
                indicated by the current value of
                radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerExtEntry 11 }

radiusAccClientExtTimeouts OBJECT-TYPE

SYNTAX Counter32
UNITS "timeouts"
MAX-ACCESS read-only
STATUS current
DESCRIPTION

             "The number of accounting timeouts to this server.
              After a timeout, the client may retry to the same
              server, send to a different server, or give up.
              A retry to the same server is counted as a
              retransmit as well as a timeout.  A send to a different
              server is counted as an Accounting-Request as well as
              a timeout.  This counter may experience a discontinuity
              when the RADIUS Accounting Client module within the
              managed entity is reinitialized, as indicated by the
              current value of radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 2"
         ::= { radiusAccServerExtEntry  12 }

radiusAccClientExtUnknownTypes OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS packets of unknown type that
                were received from this server on the accounting port.
                This counter may experience a discontinuity when the
                RADIUS Accounting Client module within the managed
                entity is reinitialized, as indicated by the current
                value of radiusAccClientCounterDiscontinuity."
         REFERENCE "RFC 2866 section 4"
         ::= { radiusAccServerExtEntry  13 }

radiusAccClientExtPacketsDropped OBJECT-TYPE

         SYNTAX Counter32
         UNITS "packets"
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
               "The number of RADIUS packets that were received from
                this server on the accounting port and dropped for some
                other reason.  This counter may experience a
                discontinuity when the RADIUS Accounting Client module
                within the managed entity is reinitialized, as indicated
                by the current value of
                radiusAccClientCounterDiscontinuity."
         ::= { radiusAccServerExtEntry  14 }

radiusAccClientCounterDiscontinuity OBJECT-TYPE

            SYNTAX TimeTicks
            UNITS "centiseconds"
            MAX-ACCESS read-only
            STATUS current
            DESCRIPTION
                  "The number of centiseconds since the last
                   discontinuity in the RADIUS Accounting Client
                   counters.  A discontinuity may be the result of a
                   reinitialization of the RADIUS Accounting Client
                   module within the managed entity."
            ::= { radiusAccServerExtEntry 15 }
   
   -- conformance information
   
   radiusAccClientMIBConformance  OBJECT IDENTIFIER
         ::= { radiusAccClientMIB 2 }
   
   radiusAccClientMIBCompliances  OBJECT IDENTIFIER
         ::= { radiusAccClientMIBConformance 1 }
   
   radiusAccClientMIBGroups  OBJECT IDENTIFIER
         ::= { radiusAccClientMIBConformance 2 }

-- units of conformance

radiusAccClientMIBCompliance MODULE-COMPLIANCE

        STATUS  deprecated
        DESCRIPTION
              "The compliance statement for accounting clients
               implementing the RADIUS Accounting Client MIB.
               Implementation of this module is for IPv4-only
               entities, or for backwards compatibility use with
               entities that support both IPv4 and IPv6."
        MODULE  -- this module
            MANDATORY-GROUPS { radiusAccClientMIBGroup }
        
        ::= { radiusAccClientMIBCompliances 1 }

radiusAccClientExtMIBCompliance MODULE-COMPLIANCE

        STATUS  current
        DESCRIPTION
              "The compliance statement for accounting
               clients implementing the RADIUS Accounting
               Client IPv6 Extensions MIB.  Implementation of
               this module is for entities that support IPv6,
               or support IPv4 and IPv6."
        MODULE  -- this module
            MANDATORY-GROUPS { radiusAccClientExtMIBGroup }
        
        OBJECT radiusAccServerInetAddressType
        SYNTAX InetAddressType { ipv4(1), ipv6(2) }
        DESCRIPTION
              "An implementation is only required to support
               IPv4 and globally unique IPv6 addresses."

OBJECT radiusAccServerInetAddress
SYNTAX InetAddress ( SIZE (4|16) )
DESCRIPTION

"An implementation is only required to support

IPv4 and globally unique IPv6 addresses."

        ::= { radiusAccClientMIBCompliances 2 }

-- units of conformance

radiusAccClientMIBGroup OBJECT-GROUP

        OBJECTS { radiusAccClientIdentifier,
                  radiusAccClientInvalidServerAddresses,
                  radiusAccServerAddress,
                  radiusAccClientServerPortNumber,
                  radiusAccClientRoundTripTime,
                  radiusAccClientRequests,
                  radiusAccClientRetransmissions,
                  radiusAccClientResponses,
                  radiusAccClientMalformedResponses,
                  radiusAccClientBadAuthenticators,
                  radiusAccClientPendingRequests,
                  radiusAccClientTimeouts,
                  radiusAccClientUnknownTypes,
                  radiusAccClientPacketsDropped
            }
        STATUS  deprecated
        DESCRIPTION
              "The basic collection of objects providing management of
               RADIUS Accounting Clients."
        ::= { radiusAccClientMIBGroups 1 }

radiusAccClientExtMIBGroup OBJECT-GROUP

OBJECTS { radiusAccClientIdentifier,

                  radiusAccClientInvalidServerAddresses,
                  radiusAccServerInetAddressType,
                  radiusAccServerInetAddress,
                  radiusAccClientServerInetPortNumber,
                  radiusAccClientExtRoundTripTime,
                  radiusAccClientExtRequests,
                  radiusAccClientExtRetransmissions,
                  radiusAccClientExtResponses,
                  radiusAccClientExtMalformedResponses,
                  radiusAccClientExtBadAuthenticators,
                  radiusAccClientExtPendingRequests,
                  radiusAccClientExtTimeouts,
                  radiusAccClientExtUnknownTypes,
                  radiusAccClientExtPacketsDropped,
                  radiusAccClientCounterDiscontinuity
        
            }
        STATUS  current
        DESCRIPTION
              "The basic collection of objects providing management of
               RADIUS Accounting Clients."
        ::= { radiusAccClientMIBGroups 2 }
   
   END

8. Security Considerations

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

There are a number of managed objects in this MIB that may contain sensitive information. These are:

radiusAcctServerIPAddress

This can be used to determine the address of the RADIUS accounting server with which the client is communicating. This information could be useful in mounting an attack on the accounting server.

radiusAcctServerInetAddress

This can be used to determine the address of the RADIUS accounting server with which the client is communicating. This information could be useful in mounting an attack on the accounting server.

radiusAcctClientServerPortNumber

This can be used to determine the port number on which the RADIUS accounting client is sending. This information could be useful in impersonating the client in order to send data to the accounting server.

radiusAcctClientServerInetPortNumber

This can be used to determine the port number on which the RADIUS accounting client is sending. This information could be useful in impersonating the client in order to send data to the accounting server.

It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment.

SNMP versions prior to SNMPv3 do not provide a secure environment. Even if the network itself is secure (for example by using IPsec), 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.

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.

9. References

9.1. Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.
   
   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
   
   [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "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.
   
   [RFC2866]  Rigney, C., "RADIUS Accounting", RFC 2866, June 2000.
   
   [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.
   
   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network
              Addresses", RFC 4001, February 2005.

9.2. Informative References

   [RFC2620]  Aboba, B. and G. Zorn, "RADIUS Accounting Client MIB",
              RFC 2620, June 1999.
   
   [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.
   
   [RFC4671]  Nelson, D., "RADIUS Accounting Server MIB for IPv6", RFC
              4671, August 2006.

Appendix A. Acknowledgements

The authors of the original MIB are Bernard Aboba and Glen Zorn.

Many thanks to all reviewers, especially to Dave Harrington, Dan Romascanu, C.M. Heard, Bruno Pape, Greg Weber, and Bert Wijnen.

Author's Address

   David B. Nelson
   Enterasys Networks
   50 Minuteman Road
   Andover, MA  01810
   USA

EMail:

          dnelson@enterasys.com

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