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          Network Working Group                                       R. B. Hibbs
          INTERNET-DRAFT                                           UltraDNS Corp.
          Category:  Standards Track                                    G. Waters
                                                                  Nortel Networks
                                                                    November 2000

                   Dynamic Host Configuration Protocol (DHCP) Server MIB


                             <draft-ietf-dhc-server-mib-05.txt>
                             Monday, November 13, 2000, 3:50 PM

          Status of this Memo

            This document is an Internet-Draft and is in full conformance with
            all provisions of Section 10 of RFC2026.

            Internet-Drafts are working documents of the Internet Engineering
            Task Force (IETF), its areas, and its working groups.  Note that
            other groups may also distribute working documents as Internet-
            Drafts.

            Internet-Drafts are draft documents valid for a maximum of six
            months and may be updated, replaced, or obsoleted by other documents
            at any time.  It is inappropriate to use Internet-Drafts as
            reference material or to cite them other than as "work in progress.

     The list of current Internet-Drafts can be accessed at
     http://www.ietf.org/ietf/1id-abstracts.txt

     The list of Internet-Draft Shadow Directories can be accessed at
     http://www.ietf.org/shadow.html.
"

            To learn the current status of any Internet-Draft, please check the
            "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow
            Directories on ds.internic.net (US East Coast), nic.nordu.net
            (Europe), ftp.isi.edu (US West Coast), or munnari.oz.au (Pacific
            Rim).

          Copyright Notice

            Copyright (C) The Internet Society (2000).  All Rights Reserved.

          Abstract

            This memo defines an experimental portion of the Management
            Information Base (MIB) for use with network management protocols in
            the Internet Community.  In particular, it defines objects used for
            the management of Dynamic Host Configuration Protocol (DHCP) and
            Bootstrap Protocol (BOOTP) servers.

















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          Table of Contents

            1. Introduction......................................................2
            2. Overview..........................................................2
             2.1. BOOTP and DHCP Counter Groups.................................3
             2.2. BOOTP and DHCP Statistics Group...............................3
             2.3. Server Configuration Group....................................3
             2.4. Response Times and ICMP Echo..................................5
            3. Definitions.......................................................5
            4. Intellectual Property............................................31
            5. Notes............................................................31
             5.1. Issues.......................................................31
             5.2. Changes from Prior Drafts....................................32
            6. Acknowledgements.................................................33
            7. Security Considerations..........................................33
            8. References.......................................................33
            9. Editors' Addresses...............................................34
            10. Full Copyright Statement........................................34



          1. Introduction

            This memo was produced by the DHCP Working Group and defines a
            portion of the Management Information Base (MIB) for use with
            network management protocols in the Internet community.  In
            particular, it describes a set of extensions that DHCP and Bootstrap
            Protocol (BOOTP) servers implement.  Many implementations support
            both DHCP and BOOTP within a single server and hence this memo
            describes the MIB for both DHCP and BOOTP servers.

            This memo does not cover DHCP/BOOTP client nor relay agent MIB
            extensions: these are possibly the subjects of future investigation.

            This memo is based on the Internet-standard Network Management
            Framework as defined by documents [RFC1902, RFC1903, RFC1904].

            Objects defined in this MIB allow access to and control of DHCP
            Server Software.  Servers MAY also provide additional management
            capabilities through the use of the Applications MIB [RFC2287].

            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 document
            [RFC2119].


          2. Overview

            In the tradition of the Simple Network Management Protocol (SNMP)
            the minimum number of objects possible are defined in this MIB,
            while still providing as rich a set of management information as
            possible.  An object is left out of this MIB when it can be derived
            from other objects that are provided.  Further to the tradition of
            the SNMP, computationally intense operations are left to the domain
            of the management station.  Thus, this MIB provides a set of objects
            from which other management information may be derived.


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            The examples provided in the following sections are not meant to be
            comprehensive, they are merely illustrative of the potential uses of
            the objects defined by this MIB.

          2.1. BOOTP and DHCP Counter Groups

            This section describes some of the management information that may
            be derived from the objects provided in the counter groups.

            The total number of valid DHCP packets received by the server is
            computed as the sum of the dhcpCountDiscovers, dhcpCountRequests,
            dhcpCountReleases, dhcpCountDeclines, and dhcpCountInforms objects.
            The total number of valid packets (BOOTP and DHCP) received is
            computed as the total number of valid DHCP packets plus the value of
            the bootpCountRequests object.  The total number of packets received
            is computed as the total number of valid packets plus
            bootpCountInvalids and dhcpCountInvalids.

            Similar to the received computations, the total number of DHCP
            packets sent by the server is computed as the sum of the
            dhcpCountOffers, dhcpCountAcks, and dhcpCountNacks objects.  The
            number of packets (BOOTP and DHCP) sent by the server is computed as
            the total number of DHCP packets sent plus the value of the
            bootpCountReplies object.

          2.2. BOOTP and DHCP Statistics Group

            This section describes some of the management information that may
            be derived from the objects provided in the statistics group.

            Given time 1 (t1) and time 2 (t2) greater than t1, the mean inter-
            arrival time of valid DHCP messages for the interval t1 to t2 can be
            computed as (dhcpStatLastArrivalTime at t2 minus
            dhcpStatLastArrivalTime at t1) divided by (valid DHCP received
            packet count at t2 minus valid DHCP received packet count at t1).

            Under the simplifying assumption that the capture of packet counts
            and times is discontinuous (that is, for the measurement interval
            the captured data represents the complete set for the server) the
            variance of the mean may be computed as
            (dhcpStatSumSquaresArrivalTime at t2 less
            dhcpStatSumSquaresArrivalTime at t1) divided by (valid DHCP received
            packet count at t2 less valid DHCP received packet count at t1).
            Standard deviation of the mean is the square root of the variance.

            Calculation of statistics for message response time is entirely
            similar to the calculations for inter-arrival time, except that the
            response time objects are used for the calculations.

            Calculation of statistics for BOOTP is similar to the calculations
            for DHCP, except that the similar objects from the bootStatistics
            group are used instead of the objects from dhcpStatistics group.

          2.3. Server Configuration Group

            The server configuration group contains objects that describe the
            configuration information that is contained in the server.  Some of


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            the configuration information is static (e.g.: a statically
            configured IP address) and some of the configuration is dynamic
            (e.g.: an assigned DHCP lease).  The intent of the server
            configuration group is to be able to read the server's
            configuration. Mechanisms outside of the SNMP are currently in use
            (e.g.: vendor defined solutions) and are being standardized (e.g.:
            the Directory Enabled Networks [DEN] initiative) to update a
            server's configuration.

            The configuration information provides a minimal set of information
            that most servers should be able to provide.  Each row of the
            serverSubnetTable lists the subnet, the subnet mask, and the subnet
            that is equivalent to this subnet.  Equivalence is defined as more
            than one subnet being present on the same physical media as some
            other subnet.

            The serverRangeTable lists the start and end IP addresses of the
            ranges and the subnet which the range is a member of.  The
            serverRangeInUse object indicates the amount of the range that is
            currently in use, either through dynamic allocation or being
            reserved.  The range size can be computed by taking the difference
            of the serverRangeStart and serverRangeEnd objects.

            The serverAddressTable provides information about the static and
            dynamic addresses that the server contains in its configuration.
            Addresses may be:

            o Static, in which case they are predefined though the server's
              configuration.  Static addresses may or may not have been
              previously served by the server;

            o Dynamic, in which case the server has served the addresses at
              least once.  Leases which have expired MAY appear in the address
              list;

            o Configuration-reserved, in which case the address is not
              available for the server to allocate to a client.  A
              configuration-reserved address is one that has been reserved by
              the administrator. An example of a configuration-reserved address
              is an address that is assigned to a client, not through DHCP
              (e.g.: statically assigned), and the address is within a DHCP
              range;  and,

            o Server-reserved, in which case the server has taken the address
              out of use.  Examples of server-reserved addresses are those
              which have been declined (i.e.: through a DHCPDECLINE) by a
              client or those which have responded to an ICMP echo before they
              were assigned.

            The protocol used to allocate the address may be determined from the
            serverAddressServedProtocol object.  This object indicates whether
            the address has never been served (value of none(1)), or, whether
            BOOTP or DHCP was used to allocate the address.






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          2.4. Response Times and ICMP Echo

            According to [RFC2131], servers SHOULD try to determine if an
            address is in use before assigning it.  Some servers choose not to
            perform this check, letting the client determine for itself if the
            address is in use.  Other servers perform an ICMP echo (Ping) just
            prior to assigning an address.  Servers that perform a Ping before
            responding to a DHCPDISCOVER should not include in the response time
            the time from when the Ping was transmitted until the time that
            either a response was received or that the server timed out waiting
            for a response.


          3. Definitions


            -- definitions for a DHCP (Dynamic Host Configuration Protocol)
            server

            DHCP-SERVER-MIB DEFINITIONS ::= BEGIN

            IMPORTS
               Counter64, Counter32, Gauge32, Unsigned32, mib-2,
               MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY, IpAddress
                  FROM SNMPv2-SMI

               TEXTUAL-CONVENTION, RowStatus, DisplayString, TruthValue,
               DateAndTime
                  FROM SNMPv2-TC

               MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP  #
            /*modified*/
                  FROM SNMPv2-CONF;

            dhcp OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "The dhcp branch in the standard network management
            framework."
               ::= { mib-2 99 }  -- IANA will make official assignment

            dhcpServerMIB MODULE-IDENTITY  # /*renamed*/
               LAST-UPDATED "9910060000Z"
               ORGANIZATION "IETF DHCP Working Group"
               CONTACT-INFO
                  "     Richard Barr Hibbs
                  Postal: UltraDNS Corporation
                        800 North San Mateo Drive
                        San Mateo, CA 94401-2261
                        USA
                  Tel:  +1 650-227-2678
                  Fax:  +1 650-227-2662
                  Email:  rbhibbs@ultraDNS.com

                        Glenn Waters
                  Postal: Nortel Networks, Inc.
                        310-875 Carling Avenue


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                        Ottawa, Ontario K1S 5P1
                        Canada
                  Tel:  +1 613-765-0249
                  Email:  gww@nortelnetworks.com"
               DESCRIPTION
                  "The MIB module for entities implementing the server side of
            the
                  Bootstrap Protocol (BOOTP) and the Dynamic Host Configuration
                  protocol (DHCP) for Internet Protocol version 4(IPv4).  This
            MIB
                  does not include support for Dynamic DNS (DDNS) updating nor
            for
                  the DHCP Failover Protocol."
               ::= { dhcp 1 }

            dhcpServerMIBObjects OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "DHCP Server MIB objects are all defined in this branch."
               ::= { dhcpServerMIB 1 }

            serverSystem OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Group of objects that are related to the overall system."
               ::= { dhcpServerMIBObjects 1 }

            bootpCounters OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Group of objects that count various BOOTP events."
               ::= { dhcpServerMIBObjects 2 }

            dhcpCounters OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Group of objects that count various DHCP events."
               ::= { dhcpServerMIBObjects 3 }

            bootpStatistics OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Group of objects that measure various BOOTP statistics."
               ::= { dhcpServerMIBObjects 4 }

            dhcpStatistics OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Group of objects that measure various DHCP statistics."
               ::= { dhcpServerMIBObjects 5 }

            serverConfiguration OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Objects that contain pre-configured and dynamic
            configuration
                  information."


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               ::= { dhcpServerMIBObjects 6 }

            clientGroup OBJECT-IDENTITY
               STATUS                         current
               DESCRIPTION
                  "Objects that map DHCP and BOOTP clients to IP addresses."
               ::= { dhcpServerMIBObjects 7 }

            -- Textual conventions defined by this memo

            DhcpTimeInterval ::= TEXTUAL-CONVENTION
               STATUS                         current
               DESCRIPTION
                  "The number of milli-seconds that has elapsed since some
            epoch.
                  Systems that cannot measure events to the milli-second
                  resolution SHOULD round this value to the next available
                  resolution that the system supports."
               SYNTAX                         Unsigned32

            PhysicalAddress ::= TEXTUAL-CONVENTION
               DISPLAY-HINT "t,xx[:xx...]"
               STATUS                            current
               REFERENCE                             "RFC 2131"
               DESCRIPTION
                  "A harware type and hardware address.  This object is
                  encoded as
                        <type ><address>
                     where
                        <type> is the value of the hardware type space
                             field, as used in ARP (e.g., 1 for Ethernet,
                             6 for token ring).  IANA maintains the list of
                             registered numbers for this field. The value for
                             this field comes from the 'htype' field in the
            BOOTP
                             packet header.
                        <address> is the hardware address of the MAC (Media
                             Adapter Card) interface. The value for this field
                             comes from the 'chaddr' field in the BOOTP packet
                             header."
               SYNTAX                            OCTET STRING (SIZE (0 | 2..17))

            -- serverSystem Group

            serverSystemDescr OBJECT-TYPE
               SYNTAX                         DisplayString (SIZE (0..255))
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "A textual description of the server.  This value should
                  include the full name and version identification of the
            server.
                  This string MUST contain only printable NVT ASCII
            characters."
               ::= { serverSystem 1 }

            serverSystemObjectID OBJECT-TYPE


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               SYNTAX                         OBJECT IDENTIFIER
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The vendor's authoritative identification of the network
                  management subsystem contained in this entity.  This value is
                  allocated within the SMI enterprise subtree (1.3.6.1.4.1) and
                  provides an easy and unambiguous means for determining 'what
                  kind of server' is being managed.  For example, if vendor
                  'VeryBigServers, Inc.' is assigned the subtree
                  1.3.6.1.4.1.4242, it may assign the identifier
                  1.3.6.1.4.1.4242.1.1 to its `Hercules DHCP Server'."
               ::= { serverSystem 2 }


            -- bootpCounters Group

            bootpCountRequests OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of packets received that contain a Message Type
            of
                  1 (BOOTREQUEST) in the first octet and do not contain option
                  number 53 (DHCP Message Type) in the options."
               ::= { bootpCounters 1 }

            bootpCountInvalids OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of packets received that do not contain a Message
                  Type of 1 (BOOTREQUEST) in the first octet or are not valid
                  BOOTP packets (e.g., too short, invalid field in packet
                  header)."
               ::= { bootpCounters 2 }

            bootpCountReplies OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of packets sent that contain a Message Type of 1
                  (BOOTREQUEST) in the first octet and do not contain option
                  number 53 (DHCP Message Type) in the options."
               ::= { bootpCounters 3 }

            bootpCountDroppedUnknownClients OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of BOOTP packets dropped due to the server not
                  recognizing or not providing service to the hardware address
                  received in the incoming packet."


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               ::= { bootpCounters 4 }

            bootpCountDroppedNotServingSubnet OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of BOOTP packets dropped due to the server not
                  being configured or not otherwise able to serve addresses on
                  the subnet from which this message was received."
               ::= { bootpCounters 5 }


            -- dhcpCounters Group

            dhcpCountDiscovers OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPDISCOVER (option 53 with value 1) packets
                  received."
               ::= { dhcpCounters 1 }

            dhcpCountRequests OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPREQUEST (option 53 with value 3) packets
                  received."
               ::= { dhcpCounters 2 }

            dhcpCountReleases OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPRELEASE (option 53 with value 7) packets
                  received."
               ::= { dhcpCounters 3 }

            dhcpCountDeclines OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPDECLINE (option 53 with value 4) packets
                  received."
               ::= { dhcpCounters 4 }

            dhcpCountInforms OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPINFORM (option 53 with value 8) packets


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                  received."
               ::= { dhcpCounters 5 }

            dhcpCountInvalids OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCP packets received whose DHCP message type
                  (i.e., option number 53) is not understood or handled by the
                  server."
               ::= { dhcpCounters 6 }

            dhcpCountOffers OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPOFFER (option 53 with value 2) packets
                  sent."
               ::= { dhcpCounters 7 }

            dhcpCountAcks OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPACK (option 53 with value 5) packets
            sent."
               ::= { dhcpCounters 8 }

            dhcpCountNacks OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCPNACK (option 53 with value 6) packets
            sent."
               ::= { dhcpCounters 9 }

            dhcpCountDroppedUnknownClient OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCP packets dropped due to the server not
                  recognizing or not providing service to the client-id and/or
                  hardware address received in the incoming packet."
               ::= { dhcpCounters 10 }

            dhcpCountDroppedNotServingSubnet OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of DHCP packets dropped due to the server not
            being


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                  configured or not otherwise able to serve addresses on the
                  subnet from which this message was received."
               ::= { dhcpCounters 11 }


            -- bootpStatistics group

            bootpStatMinArrivalInterval OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The minimum amount of time between receiving two BOOTP
                  messages.  A message is received at the server when the
            server
                  is able to begin processing the message.  This typically
            occurs
                  immediately after the message is read into server memory.  If
                  no messages have been received, then this object contains a
                  zero value."
               ::= { bootpStatistics 1 }

            bootpStatMaxArrivalInterval OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The maximum amount of time between receiving two BOOTP
                  messages.  A message is received at the server when the
            server
                  is able to begin processing the message.  This typically
            occurs
                  immediately after the message is read into server memory.  If
                  no messages have been received, then this object contains a
                  zero value."
               ::= { bootpStatistics 2 }

            bootpStatLastArrivalTime OBJECT-TYPE
               SYNTAX                         DateAndTime
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The date and time that the last valid BOOTP message was
                  received by the server.  Invalid messages do not cause this
                  value to change.  If valid no messages have been received,
            then
                  this object contains a date and time that is all zero."
               ::= { bootpStatistics 3 }

            bootpStatSumSquaresArrivalTime OBJECT-TYPE
               SYNTAX                         Counter64
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the squared BOOTP packet inter-arrival times in
                  micro-seconds.  This value may be used to compute the
            variance


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                  and standard deviation of the BOOTP arrival times.  Note that
            a
                  micro-second resolution of this object requires a clock
                  resolution to the milli-second since the square of a milli-
                  second value produces a value with micro-second resolution."
               ::= { bootpStatistics 4 }

            bootpStatMinResponseTime OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The smallest time interval measured as the difference
            between
                  the arrival of a BOOTP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.

                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { bootpStatistics 5 }

            bootpStatMaxResponseTime OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The largest time interval measured as the difference between
                  the arrival of a BOOTP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.

                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { bootpStatistics 6 }

            bootpStatSumResponseTime OBJECT-TYPE


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               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the response time intervals in milli-seconds
            where
                  a response time interval is measured as the difference
            between
                  the arrival of a BOOTP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.

                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { bootpStatistics 7 }

            bootpStatSumSquaresResponseTime OBJECT-TYPE
               SYNTAX                         Counter64
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the squared BOOTP packet response times in micro-
                  seconds.  This value may be used to compute the variance and
                  standard deviation of the BOOTP response times.  Note that a
                  micro-second resolution of this object requires a clock
                  resolution to the milli-second since the square of a milli-
                  second value produces a value with micro-second resolution."
               ::= { bootpStatistics 8 }


            -- dhcpStatistics group

            dhcpStatMinArrivalInterval OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The minimum amount of time between receiving two DHCP
                  messages.  A message is received at the server when the
            server
                  is able to begin processing the message.  This typically
            occurs
                  immediately after the message is read into server memory.  If
                  no messages have been received, then this object contains a
                  zero value."
               ::= { dhcpStatistics 1 }



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            dhcpStatMaxArrivalInterval OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The maximum amount of time between receiving two DHCP
                  messages.  A message is received at the server when the
            server
                  is able to begin processing the message.  This typically
            occurs
                  immediately after the message is read into server memory.  If
                  no messages have been received, then this object contains a
                  zero value."
               ::= { dhcpStatistics 2 }

            dhcpStatLastArrivalTime OBJECT-TYPE
               SYNTAX                         DateAndTime
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The date and time that the last valid DHCP message was
                  received by the server.  Invalid messages do not cause this
                  value to change.  If no valid messages have been received,
            then
                  this object contains a date and time that is all zero."
               ::= { dhcpStatistics 3 }

            dhcpStatSumSquaresArrivalTime OBJECT-TYPE
               SYNTAX                         Counter64
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the squared DHCP packet inter-arrival times in
                  micro-seconds.  This value may be used to compute the
            variance
                  and standard deviation of the DHCP arrival times.  Note that
            a
                  micro-second resolution of this object requires a clock
                  resolution to the milli-second since the square of a milli-
                  second value produces a value with micro-second resolution."
               ::= { dhcpStatistics 4 }

            dhcpStatMinResponseTime OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The smallest time interval measured as the difference
            between
                  the arrival of a DHCP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.


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                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { dhcpStatistics 5 }

            dhcpStatMaxResponseTime OBJECT-TYPE
               SYNTAX                         DhcpTimeInterval
               MAX-ACCESS  read-write
               STATUS                         current
               DESCRIPTION
                  "The largest time interval measured as the difference between
                  the arrival of a DHCP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.
                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { dhcpStatistics 6 }

            dhcpStatSumResponseTime OBJECT-TYPE
               SYNTAX                         Counter32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the response time intervals in milli-seconds
            where
                  a response time interval is measured as the difference
            between
                  the arrival of a DHCP message at the server and the
            successful
                  transmission of the response to that message.  A message is
                  received at the server when the server is able to begin
                  processing the message.  A message is transmitted after the
                  server has no further use for the message.  Note that the
                  operating system may still have the message queued
            internally.
                  The operating system queue time is not to be considered as
            part
                  of the response time.  Invalid messages do not cause this
            value
                  to change.  If no valid messages have been received, then
            this
                  object contains a zero value."
               ::= { dhcpStatistics 7 }


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            dhcpStatSumSquaresResponseTime OBJECT-TYPE
               SYNTAX                         Counter64
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The sum of the squared DHCP packet response times in micro-
                  seconds.  This value may be used to compute the variance and
                  standard deviation of the DHCP response times.  Note    that
            a
                  micro-second resolution of this object requires a clock
                  resolution to the milli-second since the square of a milli-
                  second value produces a value with micro-second resolution."
               ::= { dhcpStatistics 8 }


            -- serverConfiguration group

            serverSubnetTable OBJECT-TYPE
               SYNTAX                         SEQUENCE OF ServerSubnetEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "A list of subnets that are configured in this server."
               ::= { serverConfiguration 1 }

            serverSubnetEntry OBJECT-TYPE
               SYNTAX                         ServerSubnetEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               INDEX    { serverSubnet  }
               DESCRIPTION
                  "A logical row in the serverSubnetTable."
               ::= { serverSubnetTable 1 }

            ServerSubnetEntry ::= SEQUENCE {
               serverSubnet                      IpAddress,
               serverSubnetMask                       IpAddress,
               serverSubnetSharedNet                  IpAddress,
               serverSubnetConfiguredAddresses        Unsigned32,
               serverSubnetAvailableAddresses         Unsigned32,
               serverSubnetFreeAddressLowThreshold         Unsigned32,
               serverSubnetFreeAddressHighThreshold   Unsigned32
               }

            serverSubnet OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "The IP address of the subnet."
               ::= { serverSubnetEntry 1 }

            serverSubnetMask OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current


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               DESCRIPTION
                  "The subnet mask of the subnet.  This MUST be the same as the
                  value of DHCP option 1 offered to clients on this subnet."
               ::= { serverSubnetEntry 2 }

            serverSubnetSharedNet OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The IP address of another subnet that is on the same shared
                  media as this subnet.  The address of the shared subnet MUST
                  also be configured on this server.  The address 0.0.0.0
            should
                  be used if this subnet is not shared."
               ::= { serverSubnetEntry 3 }

            serverSubnetConfiguredAddresses OBJECT-TYPE
               SYNTAX                         Unsigned32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                   "The number of IP addresses that are configured to be served
                   on this subnet."
               ::= { serverSubnetEntry 4 }

            serverSubnetAvailableAddresses OBJECT-TYPE
               SYNTAX                         Unsigned32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                   "The number of IP addresses on this subnet that are not
                   currently assigned to a client."
               ::= { serverSubnetEntry 5 }

            serverSubnetFreeAddressLowThreshold OBJECT-TYPE  # /*new*/
               SYNTAX                         Unsigned32
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "The low threshold for available free addresses in this
            subnet.
                  If the value for available free addresses in this subnet
                  becomes equal to or less than this value, a
                  serverSubnetFreeAddressLowThreshold event is generated
                  for this shared network.  No more
                  serverSubnetFreeAddressLowThreshold events will
                  be generated for this subnet during this execution of
                  the DHCP server until the value for available free addresses
            has
                  exceeded the value of serverSubnetFreeAddressHighThreshold.

                  This value may be expressed as either an absolute value or a
                  percentage; the units are specified by the value of
                  serverSubnetFreeAddressUnits."
               ::= { serverSubnetEntry 6 }



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            serverSubnetFreeAddressHighThreshold OBJECT-TYPE  # /*new*/
               SYNTAX                         Unsigned32
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "The high threshold for available free addresses in this
            subnet.
                  If a serverSubnetFreeAddressLowThreshold event
                  has been generated for this subnet, and the value for
                  available free addresses has exceeded the value of
                  serverSubnetFreeAddressHighThreshold, then a
                  serverFreeAddressessHigh event will be generated.  No more
                  serverFreeAddressessHigh events will be generated for this
                  subnet during this execution of the DHCP server until
                  the value for available free addresses becomes equal to or
            less
                  than the value of  serverSubnetFreeAddressHighThreshold.

                  This value may be expressed as either an absolute value or a
                  percentage; the units are specified by the value of
                  serverSubnetFreeAddressUnits."
               ::= { serverSubnetEntry 7 }

            serverRangeTable OBJECT-TYPE
               SYNTAX                         SEQUENCE OF ServerRangeEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "A list of ranges that are configured on this server."
               ::= { serverConfiguration 2 }

            serverRangeEntry OBJECT-TYPE
               SYNTAX                         ServerRangeEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               INDEX    { serverRangeStart  }
               DESCRIPTION
                  "A logical row in the serverRangeTable."
               ::= { serverRangeTable 1 }

            ServerRangeEntry ::= SEQUENCE {
               serverRangeStart                  IpAddress,
               serverRangeEnd                                                   IpAddress,
               serverRangeSubnetMask             IpAddress,
               serverRangeInUse                  Gauge32,
               serverRangeOutstandingOffers      Gauge32
               }

            serverRangeStart OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "The IP address of the first address in the range.  The value
            of
                  range start must be less than or equal to the value of range
                  end."


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               ::= { serverRangeEntry 1 }

            serverRangeEnd OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The IP address of the last address in the range.  The value
            of
                  range end must be greater than or equal to the value of range
                  start."
               ::= { serverRangeEntry 2 }

            serverRangeSubnetAddress OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The subnet address
                  for this range."
               ::= { serverRangeEntry 3 }

            serverRangeInUse OBJECT-TYPE
               SYNTAX                         Gauge32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of addresses in this range that are currently in
                  use.  This number includes those addresses whose lease has
            not
                  expired and addresses which have been reserved (either by the
                  server or through configuration)."
               ::= { serverRangeEntry 4 }

            serverRangeOutstandingOffers OBJECT-TYPE
               SYNTAX                         Gauge32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of outstanding DHCPOFFER messages for this range
            is
                  reported with this value.  An offer is outstanding if the
                  server has sent a DHCPOFFER message to a client, but has not
                  yet received a DHCPREQUEST message from the client nor has
            the
                  server-specific timeout (limiting the time in which a client
                  can respond to the offer message) for the offer message
                  expired."
               ::= { serverRangeEntry 5 }


            serverAddressTable OBJECT-TYPE
               SYNTAX                         SEQUENCE OF ServerAddressEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "A list of addresses that are known by this server.  The list


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                  MUST contain addresses that have not expired.  The list MUST
                  NOT contain addresses that have never been assigned by the
                  server UNLESS the lease is pre-configured in the server
            (e.g.,
                  a static lease on a subnet)."
               ::= { serverConfiguration 3 }

            serverAddressEntry OBJECT-TYPE
               SYNTAX                         ServerAddressEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               INDEX    { serverAddress }
               DESCRIPTION
                  "A logical row in the serverAddressTable."
               ::= { serverAddressTable 1 }

            ServerAddressEntry ::= SEQUENCE {
               serverAddress                                             IpAddress,
               serverAddressSubnetMask           IpAddress,
               serverAddressRange           IpAddress,
               serverAddressType                 INTEGER,
               serverAddressTimeRemaining        Unsigned32,
               serverAddressAllowedProtocol      INTEGER,
               serverAddressServedProtocol       INTEGER,
               serverAddressHardwareAddress      PhysicalAddress,
               serverAddressClientId             OCTET STRING,
               serverAddressHostName             DisplayString,
               serverAddressDomainName           DisplayString
               }

            serverAddress OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "The IP address of the entry."
               ::= { serverAddressEntry 1 }

            serverAddressSubnetMask OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The subnet mask (DHCP option 1) provided to the client
            offered
                  this address.  The subnet, resulting from logically ANDing
            the
                  subnet mask with the entry's IP address, must be configured
            on
                  this server and appear as a row in the dhcpSubnetTable."
               ::= { serverAddressEntry 2 }

            serverAddressRange OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION


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                  "The starting IP address (serverRangeStart object) of the
            range
                  to which this address belongs.  If the address does not fall
                  into one of the configured ranges (e.g., a statically
                  configured address on a subnet) the range may be 0.0.0.0."
               ::= { serverAddressEntry 3 }

            serverAddressType OBJECT-TYPE
               SYNTAX                         INTEGER {
                           static(1),
                           dynamic(2),
                           configuration-reserved(3),
                           server-reserved(4)
                           }
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The type of this address."
               ::= { serverAddressEntry 4 }

            serverAddressTimeRemaining OBJECT-TYPE
               SYNTAX                         Unsigned32
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The number of seconds until the lease expires.  A value of
                  4294967295 (i.e., 0xFFFFFFFF) should be used for leases that
                  have a lease time which is 'infinite' and for BOOTP leases."
               ::= { serverAddressEntry 5 }

            serverAddressAllowedProtocol OBJECT-TYPE
               SYNTAX                         INTEGER {
                           none(1),
                           bootp(2),
                           dhcp(3),
                           bootp-or-dhcp(4)
                           }
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The type of protocol that is allowed to be used to serve
            this
                  address.  A type of none(1) indicates that the address is not
                  available to be served (e.g., a reserved address)."
               ::= { serverAddressEntry 6 }

            serverAddressServedProtocol OBJECT-TYPE
               SYNTAX                         INTEGER {
                           none(1),
                           bootp(2),
                           dhcp(3)
                           }
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The type of protocol that was used when this address was
                  assigned.  This object will have the value of none(1) if the


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                  address has not been served."
               ::= { serverAddressEntry 7 }

            serverAddressHardwareAddress OBJECT-TYPE
               SYNTAX                         PhysicalAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The hardware type and hardware address of the client that
            has
                  been assigned this lease.  The first octet of this object
                  contains the hardware type from the 'htype' field of the
            BOOTP
                  packet and the remaining octets contain the hardware address
                  from the 'chaddr' field of the BOOTP packet.  This object may
                  be empty if the address has not been previously served."
               ::= { serverAddressEntry 8 }

            serverAddressClientId OBJECT-TYPE
               SYNTAX                         OCTET STRING (SIZE (0..255))
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The client-id of the client that has been assigned this
            lease.
                  The client-id is the value specified in option 61 (client-id
                  option) when the lease was assigned.  This object may be
            empty
                  if the lease has not been previously assigned or if the
            client-
                  id option was not specified when the address was assigned."
               ::= { serverAddressEntry 9 }

            serverAddressHostName OBJECT-TYPE
               SYNTAX                         DisplayString (SIZE (0..255))
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The host name (DHCP option 12) the client is configured to
            use,
                  or if no host name was configured then the host name that the
                  client supplied when requesting an address.  While this
            object
                  has a maximum size of 255 octets, a Fully-Qualified Domain
            Name
                  (FQDN) consisting of a Host Name part and a Domain Name part
            is
                  currently limited to 255 octets.  Therefore, the sum of the
                  string lengths for this object and the
            serverAddressDomainName
                  must, in practice, be less than 256 octets."
               ::= { serverAddressEntry 10 }

            serverAddressDomainName OBJECT-TYPE
               SYNTAX                         DisplayString (SIZE (0..255))
               MAX-ACCESS  read-only
               STATUS                         current


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               DESCRIPTION
                  "The domain name (DHCP option 15) assigned to the client.
            While
                  this object has a maximum size of 255 octets, a Fully-
            Qualified
                  Domain Name (FQDN) consisting of a Host Name part and a
            Domain
                  Name part is currently limited to 255 octets, less the
            separator
                  ('.') character.  Therefore, the sum of the string
                  lengths for this object and the serverAddressHostName must,
                  in practice, be less than 256 octets."
               ::= { serverAddressEntry 11 }


            serverClientTable OBJECT-TYPE
               SYNTAX                         SEQUENCE OF ServerClientEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                   "A list of clients that are known by this server.  Details
                   about
                   the clients may be found by indexing into the
                   serverAddressTable
                   using the serverClientAddress object.  This table is indexed
                   first by the physical address of the client and then by the
                   subnet
                   address on which the client resides.  The subnet is included
                   as
                   an index since the physical address is only guaranteed to be
                   unique
                   within a subnet (i.e., a physical address is not globally
                   unique)."
               ::= { clientConfiguration 1 }

            serverClientEntry OBJECT-TYPE
               SYNTAX                         ServerClientEntry
               MAX-ACCESS  not-accessible
               STATUS                         current
               INDEX    {
                  serverClientHardwareAddress,
                  serverClientSubnetMask
                  }
               DESCRIPTION
                  "A logical row in the serverClientTable.  An entry in this
            table
                  may be a client that requested an address but was refused
                  (e.g., not authorized).  Servers MAY track these types of
                  clients if desired and may choose to remove such client
            entries
                  using a server defined algorithm.  As an example, a server
            may
                  choose to keep client request that does not map to an address
                  for a one hour time period before removing that entry from
            this
                  table."
               ::= { serverClientTable 1 }


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            ServerClientEntry ::= SEQUENCE {
               serverClientHardwareAddress       PhsicalAddress
               serverClientSubnetMask            IpAddress,
               serverClientAddress                                              IpAddress,
               serverClientLastRequestTime       DateAndTime,
               serverClientLastRequestType       INTEGER,
               serverClientLastResponseType      INTEGER
               }

            serverClientHardwareAddress OBJECT-TYPE
               SYNTAX                         PhysicalAddress
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                   "The hardware type and hardware address of the client that
                   has
                   been assigned this lease.  The first octet of this object
                   contains the hardware type from the 'htype' field of the
                   BOOTP
                   packet and the remaining octets contain the hardware  address
                   from the 'chaddr' field of the BOOTP packet. This value of
                   this object MUST NOT be zero length."
               ::= { serverClientEntry 1 }

            serverClientSubnetMask OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  not-accessible
               STATUS                         current
               DESCRIPTION
                  "The subnet mask (DHCP option 1) applied to
          serverClientAddress."
               ::= { serverClientEntry 2 }

            serverClientAddress OBJECT-TYPE
               SYNTAX                         IpAddress
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The IP address of the entry.  May be used to index into the
                  serverAddressTable.  May be 0.0.0.0 if an address is not
                  associated with this client."
               ::= { serverClientEntry 3 }

            serverClientLastRequestTime OBJECT-TYPE
               SYNTAX                         DateAndTime
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The time when the last request was received."
               ::= { serverClientEntry 4 }

            serverClientLastRequestType OBJECT-TYPE
               SYNTAX                         INTEGER {
                           dhcpdiscover(1),
                           bootp(2),
                           dhcprequest(3),


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                           dhcpdecline(4),
                           unknown(5),
                           dhcprelease(7),
                           dhcpinform(8)
                           }
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The type of the last request that was received for this
                  client."
               ::= { serverClientEntry 5 }

            serverClientLastResponseType OBJECT-TYPE
               SYNTAX                         INTEGER {
                           bootp(1),
                           dhcpoffer(2),
                           unknown(3),
                           dhcpack(5),
                           dhcpnak(6)
                        }
               MAX-ACCESS  read-only
               STATUS                         current
               DESCRIPTION
                  "The type of the last response that was sent to this client."
               ::= { serverClientEntry 6 }


            --  serverNotifyObjects: Objects which are used only in
            notifications

            serverNotifyDuplicateIPAddress OBJECT-TYPE  # /*new*/
               SYNTAX                         IpAddress
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
               "The IP address which was found to be a duplicate."
               ::= { serverNotifyObjects 1 }

            serverNotifyMACAddress OBJECT-TYPE  # /*new*/
               SYNTAX                         PhysicalAddress
               MAX-ACCESS accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "The offending MAC address which caused a duplicate IP
                  address to be detected."
               ::= { serverNotifyObjects 2 }

            serverNotifyServer  OBJECT-TYPE  # /*new*/
               SYNTAX                         IpAddress
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "The IP Address of a server with which the DHCP server
                  is attempting to communicate."
               ::= { serverNotifyObjects 3 }

            serverNotifyDuplicateIPAddressDetectedBy OBJECT-TYPE  # /*new*/


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               SYNTAX                         INTEGER {dhcpClient(1), dhcpServer(2)}
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "For a serverDuplicateAddress notification, this
                  object indicates whether the client or server detected
                  the condition.  DHCP servers detect a duplicate address
                  by an unexpected reply to an ICMPECHOREQUEST (ææpingÆÆ)
                  message, while DHCP clients detect duplicates by an
                  unexpected reply to a gratuitous ARP message, and report
                  this condition to a DHCP server through a DHCPDECLINE
                  message."
               ::= { serverNotifyObjects 5 }

            serverNotifyContestedIpAddress OBJECT-TYPE  # /*new*/
               SYNTAX                         IpAddress
               MAX-ACCESS  accessible-for-notify
               STATUS                         current
               DESCRIPTION
                  "The IP address for which ownership is claimed by two or
                  more DHCP servers."
               ::= { serverNotifyObjects 6 }


            -- Notifications

            dhcpServerMIBNotificationPrefix OBJECT IDENTIFIER  # /*new*/
               ::= { dhcpServerMIB 2 }  # /*renamed*/
            dhcpServerMIBNotifications OBJECT IDENTIFIER  # /*new*/
               ::= { dhcpServerMIBNotificationPrefix 0 }

            serverFreeAddressLow NOTIFICATION-TYPE  # /*new*/
               OBJECTS {
                  serverSharedNetworkFreeAddressLowThreshold,
                  serverSharedNetworkFreeAddressValue,
                  serverSharedNetworkFreeAddressUnits
                  }
               STATUS  current
               DESCRIPTION
                  "This notification signifies that the number of available IP
                  addresses for a particular shared network has fallen below
            the
                  value of serverSharedNetworkFreeAddressLowThreshold for that
            shared
                  network."
               ::= { dhcpServerMIBNotifications 1 }

            serverFreeAddressHigh NOTIFICATION-TYPE  # /*new*/
               OBJECTS {
                  serverSharedNetworkFreeAddressHighThreshold,
                  serverSharedNetworkFreeAddressValue,
                  serverSharedNetworkFreeAddressUnits
                  }
               STATUS                         current
               DESCRIPTION
                  "This notification signifies that the number of available IP
                  addresses for a particular shared network has risen above the


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                  value of serverSharedNetworkFreeAddressHighThreshold for that
                  shared network."
               ::= { dhcpServerMIBNotifications 2 }

            serverServerStart NOTIFICATION-TYPE  # /*new*/
               OBJECTS     { serverNotifyServerType }
               STATUS                         current
               DESCRIPTION
                  "This notification signifies that the server of the specified
                  type has started on the host from which this notification has
                  been sent."
               ::= { dhcpServerMIBNotifications 3 }

            serverServerStop NOTIFICATION-TYPE  # /*new*/
               OBJECTS     { serverNotifyServerType }
               STATUS                         current
               DESCRIPTION
                  "This notification signifies that the server of the specified
                  type has stopped normally on the host from which this
                  notification has been sent."
               ::= { dhcpServerMIBNotifications 4 }

            serverDuplicateAddress NOTIFICATION-TYPE  # /*new*/
               OBJECTS {
                  serverNotifyDuplicateIPAddress,
                  serverNotifyMACAddress,
                  serverNotifyDuplicateIPAddressDetectedBy
                  }
               STATUS                         current
               DESCRIPTION
                  "This notification signifies that a duplicate IP address has
                  been detected.  The DHCP server can detect this condition
                  through the ping-before-offer mechanism.  Alternatively, the
                  client may have sent a DHCPDECLINE back to the server; this
            is
                  assumed to be the result of the client detecting that the
                  address was in use.  In either case, the DHCP server marks
            the
                  IP address as unavailable for leasing to clients.  The
                  serverNotifyDuplicateIPAddressDetectedBy object indicates
                  whether the client or server detected this condition."
               ::= { dhcpServerMIBNotifications 7 }


            -- Conformance

            dhcpServerMIBConformance OBJECT-IDENTITY  # /*renamed*/
               STATUS                         current
               DESCRIPTION
                  "DHCP Server MIB objects are all defined in this branch."
               ::= { dhcpServerMIB 3 }  # /*renamed*/

            dhcpServerMIBCompliances OBJECT IDENTIFIER
               ::= { dhcpServerMIBConformance 1 }  # /*renamed*/

            dhcpServerMIBGroups  OBJECT IDENTIFIER
               ::= { dhcpServerMIBConformance 2 }  # /*renamed*/


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            -- Compliance groups

            dhcpServerMIBCompliance MODULE-COMPLIANCE
               MODULE  -- this module
               MANDATORY-GROUPS {
                  serverSystemGroup,
                  bootpCountersGroup,
                  dhcpCountersGroup,
                  bootpStatisticsGroup,
                  dhcpStatisticsGroup,
                  serverConfigurationGroup,
                  serverClientsGroup
                  }
               STATUS                         current
               DESCRIPTION
                  "Describes the requirements for conformance to the DCHP
                  Server MIB"
               ::= { dhcpServerMIBCompliances 1 }

            serverSystemGroup OBJECT-GROUP
               OBJECTS {
                  serverSystemDescr,
                  serverSystemObjectID
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the serverSystemGroup."
               ::= { dhcpServerMIBGroups 1 }

            bootpCountersGroup OBJECT-GROUP
               OBJECTS {
                  bootpCountRequests,
                  bootpCountInvalids,
                  bootpCountReplies,
                  bootpCountDroppedUnknownClients,
                  bootpCountDroppedNotServingSubnet
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the bootpBountersGroup."
               ::= { dhcpServerMIBGroups 2 }

            dhcpCountersGroup OBJECT-GROUP
               OBJECTS {
                  dhcpCountDiscovers,
                  dhcpCountRequests,
                  dhcpCountReleases,
                  dhcpCountDeclines,
                  dhcpCountInforms,
                  dhcpCountInvalids,
                  dhcpCountOffers,
                  dhcpCountAcks,
                  dhcpCountNacks,
                  dhcpCountDroppedUnknownClient,
                  dhcpCountDroppedNotServingSubnet


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                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the dhcpCountersGroup."
               ::= { dhcpServerMIBGroups 3 }

            bootpStatisticsGroup OBJECT-GROUP
               OBJECTS {
                  bootpStatMinArrivalInterval,
                  bootpStatMaxArrivalInterval,
                  bootpStatLastArrivalTime,
                  bootpStatSunSquaresArrivalTime,
                  bootpStatMinResponseTime,
                  bootpStatMaxResponseTime,
                  bootpStatSumReponseTime,
                  bootpStatSumSquaresResponseTime
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the bootpStatisticsGroup."
               ::= { dhcpServerMIBGroups 4 }

            dhcpStatisticsGroup OBJECT-GROUP
               OBJECTS {
                  dhcpStatMinArrivalInterval,
                  dhcpStatMaxArrivalInterval,
                  dhcpStatLastArrivalTime,
                  dhcpStatSumSquaresArrivalTime,
                  dhcpStatMinResponseTime,
                  dhcpStatMaxResponseTime,
                  dhcpStatSumResponseTime,
                  dhcpStatSumSquaresResponseTime
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the dhcpStatisticsGroup."
               ::= { dhcpServerMIBGroups 5 }

            serverConfigurationGroup OBJECT-GROUP
               OBJECTS {
                  serverSubnet,
                  serverSubnetMask,
                  serverSubnetSharedNet,
                  serverRangeStart,
                  serverRangeEnd,
                  serverRangeSubnet,
                  serverRangeInUse,
                  serverRangeOutstandingOffers,
                  serverAddress,
                  serverAddressSubnet,
            --    serverAddressRange,  # /*duplicate*/
                  serverAddressRange,
                  serverAddressType,
                  serverAddressTimeRemaining,
                  serverAddressAllowedProtocol,
                  serverAddressServedProtocol,
                  serverAddressHardwareAddress,  # /*renamed*/


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                  serverAddressClientId,
                  serverAddressHostName,
                  serverAddressDomainName
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the serverConfigurationGroup."
               ::= { dhcpServerMIBGroups 6 }

            serverClientsGroup OBJECT-GROUP
               OBJECTS {
                  serverClientHardwareAddress,  # /*renamed*/
                  serverClientSubnet,
                  serverClientAddress,
                  serverClientLastRequestTime,
                  serverClientLastRequestType,
                  serverClientLastResponseType
                  }
               STATUS                         current
               DESCRIPTION
                  "Objects belonging to the serverClientsGroup."
               ::= { dhcpServerMIBGroups 7 }

            serverSharedNetworkObjectsGroup OBJECT-GROUP  # /*new*/
               OBJECTS {
                  serverSharedNetworkFreeAddrLowThreshold,
                  serverSharedNetworkFreeAddrHighThreshold,
                  serverSharedNetworkFreeAddrValue,
                  serverSharedNetworkFreeAddrUnits
                  }
               STATUS                         current
               DESCRIPTION
                  "DHCP Server MIB objects used in shared networks."
               ::= { dhcpServerMIBGroups 8 }

            serverNotifyObjectsGroup OBJECT-GROUP  # /*new*/
               OBJECTS {
                  serverNotifyDuplicateIPAddress,
                  serverNotifyMACAddress,
                  serverNotifyDuplicateIPAddressDetectedBy,
                  serverNotifyServer,
                  serverNotifyServerType,
                  serverNotifyContestedIpAddress
                  }
               STATUS current
               DESCRIPTION
                     "DHCP Server MIB objects used in notifications."
               ::= { dhcpServerMIBGroups 9 }

            serverNotifyicationsGroup NOTIFICATION-GROUP  # /*new*/
               NOTIFICATIONS {
                  serverFreeAddressLow,
                  serverFreeAddressHigh,
                  serverServerStart,
                  serverServerStop,
                  serverDNSQueueTooBig,
                  serverOtherServerNotResponding,


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                  serverDuplicateAddress,
                  serverAddressConflict,
                  serverOtherServerResponding,
                  serverFailoverConfigMismatch
                  }
               STATUS                         current
               DESCRIPTION
                  "Notifyications which are implemented by the DHCP Server
            agent."
               ::= { dhcpServerMIBGroups 10 }

            END



          4. Intellectual Property

            The IETF takes no position regarding the validity or scope of any
            intellectual property or other rights that might be claimed to
            pertain to the implementation or use of the technology described in
            this document or the extent to which any license under such rights
            might or might not be available; neither does it represent that it
            has made any effort to identify any such rights.  Information on the
            IETF's procedures with respect to rights in standards-track and
            standards-related documentation can be found in BCP-11.

            Copies of claims of rights made available for publication and any
            assurances of licenses to be made available, or the result of an
            attempt made to obtain a general license or permission for the use
            of such proprietary rights by implementers or users of this
            specification can be obtained from the IETF Secretariat.

            The IETF invites any interested party to bring to its attention any
            copyrights, patents or patent applications, or other proprietary
            rights which may cover technology that may be required to practice
            this standard.  Please address the information to the IETF Executive
            Director.


          5. Notes

            This section will be removed when this memo is published as an RFC.

          5.1. Issues

            o Ryan Troll proposed four or five traps that Nathan Lane
              enthusiastically supported.  If traps are to be included, that
              should be done soon.

            o what is the best way to reset statistics?

              o do we need to reset them individually, as groups, or as a
                 whole?

              o we need a timestamp of when they were reset




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            o should all invalid packets received be collapsed into a single
               counter for each protocol type (BOOTP and DHCP), or broken out by
               type of error?

            o if counted by error type, what is the set of errors that we
               should use?

            o perhaps we should develop a common vocabulary (and glossary) for
               terms such as "abandoned" so that the objects defined and their
               descriptions aren't misinterpreted by implementers.

            o do we need to be concerned about the potential size of some of
               the configuration data tables?  Wouldn't it be better to maintain
               counters for things like number of leases assigned than to expect
               the management station to calculate the values by reading very
               large tables to count the number of leases in that state?

          5.2. Changes from Prior Drafts

            The "-01" revision removed the Server Identity section from the
            proposed MIB, relying on the Application MIB to accomplish the same
            result.

            The min/max (inter-arrival and response times) were changed to
            Unsigned32 so that they could be reset.  Sum of inter-arrival and
            response times was deleted since the management station can easily
            calculate them.  The last arrival time objects were added.

            The "-03" version incorporated the proposed configuration tables
            suggested by Ryan Troll of CMU.  The "01" revision of this version
            added three elements to the server subnet table, number of
            outstanding offers, number of addresses in use, and number of free
            addresses, as well as changing subnet address to subnet mask in the
            server address, server range, and client address tables.  The client
            MAC address element of the client address table was separated into a
            1-octet hardware type and a 16-octet client hardware address,
            causing a renumbering of the elements in this table.  Clarifying
            text was added to several element descriptions, and limitations on
            values, and the reported value when the server did not support the
            data element were also specified.

            The "-03b" version incorporated an address change for one of the
            authors, revisions to standard text required by the IETF, and some
            editorial clarifications.

            The "-04" version changed the maximum size of the object
            serverAddressHostName from 64 to 255 octets, and added clarifying
            text to both that object and to serverAddressDomainName regarding
            the practical values for the length of both objects.

            The "-05" version added a number of traps suggested by Kim Kinnear,
            made a number of small renaming and renumbering changes (annotated
            in the MIB itself) and added the Shared Network concept to describe
            shared network segments:  several subnetworks that coexist on one
            medium.  This was done partly because the Address Range concept did
            not adequately describe the "scoping" of address pools as is common
            with many current server implementations.  Also updated the authorÆs


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          Internet Draft              DHCP Server MIB               November 2000

            address and contact information, and incorporated a number of
            corrections and amplifications suggested by various readers of the
            ææ-04ö draft, including a missing OID for serverNotifyObjects and a
            syntax error for PhysicalAddress.

            The "-05" draft closes several issues raised during peer review
            discussions on the DHC mailing list, incorporates several new
            elements, and makes a number of small revisions based on comments
            from reviewers.


          6. Acknowledgements

            This document is the result of work undertaken the by DHCP working
            group.  The authors would like to particularly acknowledge the
            development team from Carnegie-Mellon University whose work creating
            a private MIB for their DHCP server inspired the development of this
            proposal. In particular, many thanks to Ryan Troll who provided a
            great deal of useful feedback during the development of this MIB.

            Thanks to Kim Kinnear, Yannick Koehler, and Nathan Lane for their
            review, comments, and contributions.


          7. Security Considerations

            There are a number of management objects defined in this MIB that
            have a MAX-ACCESS clause of read-write and/or read-create. Such
            objects may be considered sensitive or vulnerable in some
            environments.  The support for SET operations in a non-secure
            environment without proper protection can have a negative effect on
            network operations.

            SNMPv1 by itself is not a secure environment.  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.

            It is recommended that the implementers consider the security
            features as provided by the SNMPv3 framework.  Specifically, the use
            of the User-based Security Model RFC 2274 [RFC2274] and the View-
            based Access Control Model RFC 2275 [RFC2275] is recommended.

            It is then a customer/user responsibility to ensure that the SNMP
            entity giving access to an instance of this MIB, 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.


          8. References

            [DEN] Directory Enabled Networks Working Group,
                 http://www.universe.digex.net/~murchiso/den.

            [RFC1902] Case, J., McCloghrie, K., Rose, M., and S.  Waldbusser,
                 "Structure of Management Information for Version 2 of the


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                 Simple Network Management Protocol (SNMPv2)", RFC 1902, January
                 1996.

            [RFC1903] Case, J., McCloghrie, K., Rose, M., and S.  Waldbusser,
                 "Textual Conventions for Version 2 of the Simple Network
                 Management Protocol (SNMPv2)", RFC 1903, January 1996.

            [RFC1904] Case, J., McCloghrie, K., Rose, M., and S.  Waldbusser,
                 "Conformance Statements for Version 2 of the Simple Network
                 Management Protocol (SNMPv2)", RFC 1904, January 1996.

            [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
                 Requirement Levels", RFC 2119, BCP 14, March 1997.

            [RFC2131] Droms, R., "Dynamic Host Configuration Protocol", RFC
                 2131, March 1997.

            [RFC2132] Alexander, S.  and Droms, R., "DHCP Options and BOOTP
                 Vendor Extensions", RFC 2132, March 1997.

            [RFC2287] Krupczak, C.  and Saperia, J., "Definitions of System-
                 Level Managed Objects for Applications", RFC 2287, February
                 1998.


          9. Editors' Addresses

            Richard Barr Hibbs
            UltraDNS Corporation
            800 North San Mateo Drive
            San Mateo, CA 94401-2261
            USA

            Phone:  +1 650-227-2678
            Fax:    +1 650-227-2662
            Email:  rbhibbs@ultraDNS.com

            Glenn Waters
            Nortel Networks
            310-875 Carling Avenue,
            Ottawa, Ontario K1S 5P1
            Canada

            Phone:  +1 613-765-0249
            Email:  gww@nortelnetworks.com


          10. Full Copyright Statement

            Copyright (C) The Internet Society (2000).  All Rights Reserved.

            This document and translations of it may be copied and furnished to
            others, and derivative works that comment on or otherwise explain it
            or assist in its implementation may be prepared, copied, published
            and distributed, in whole or in part, without restriction of any
            kind, provided that the above copyright notice and this paragraph
            are included on all such copies and derivative works.  However, this


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            document itself may not be modified in any way, such as by removing
            the copyright notice or references to the Internet Society or other
            Internet organizations, except as needed for the purpose of
            developing Internet standards in which case the procedures for
            copyrights defined in the Internet Standards process must be
            followed, or as required to translate it into languages other than
            English.

            The limited permissions granted above are perpetual and will not be
            revoked by the Internet Society or its successors or assigns.

            This document and the information contained herein is provided on an
            "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
            TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
            BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
            HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
            MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.










































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