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Network Working Group Andy Bennett
INTERNET-DRAFT Bernie Volz
Process Software
Andrea Westerinen
Microsoft
October 1999
Expires April 2000
DHCP Schema for LDAP
<draft-ietf-dhc-schema-01.txt>
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.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Abstract
This document presents an LDAP schema to represent the configuration
of the DHCP protocol within a TCP/IP network. It can be used to
represent the configuration(s) of an entire enterprise network, a
subset of the network, or even a single server.
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1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
In places where different sets of terminology are commonly used to
represent similar DHCP concepts, this schema uses the terminology of
the Internet Software Consortium's DHCP server reference implementa-
tion. For more information see www.isc.org.
2. Open Issues
The following issues still need to be resolved:
o The Policy Framework Mapping section is superficial and needs to be
updated.
o The CIM Mapping section is based on the object class definitions
from the previous revision of this draft and needs to be updated.
3. Design Considerations
Some of the design considerations for this schema were:
o Heterogeneous server environment - This schema is not designed to
represent the configuration of a specific DHCP server implementa-
tion. The intent of this schema is to provide a basic framework
for the representation of the most common elements used in the con-
figuration of DHCP. This should allow other network services to
obtain and use basic DHCP configuration information in a server-
independent way. Also note that it is highly unlikely that this
schema will be able to represent every feature of every implementa-
tion (and it is not intended to do so). It is expected that some
implementations may need to extend the schema objects in order to
fully implement all their features.
o Use of the schema - This draft does not define any "minimal compli-
ance criteria" for using the schema. It is recommended that you
use the object classes defined in this draft if you are represent-
ing DHCP configuration information in an LDAP directory. Some
implementations may choose not to support all of the objects
defined here. In particular, the following two decisions are
explicitly left up to the implementation:
- it is up to the implementation to determine whether or not the
lease information will be stored in the directory. Some imple-
mentations may choose not to store this information.
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- it is up to the implementation to determine if the data in the
directory is considered "authoritative", or if it is simply a
copy of data from an authoritative source.
o The schema is focused on the representation of configuration infor-
mation. It does not provide for the representation of statistical
data, or historical lease data, only the current state of the DHC
protocol's configuration.
o The information in this schema will be used primarily by two types
of applications: DHCP servers (for loading their configuration)
and Management Interfaces (for defining/editing configurations).
The schema should must be efficient for the needs of both types of
applications.
o The schema is designed to allow objects managed by DHCP (such as
computers, subnets, etc) to be present anywhere in a directory
hierarchy (to allow those objects to be placed in the directory for
managing administrative control and access to the objects). How-
ever, the schema also provides for the possibility that any given
object may have multiple sets of configuration parameters defined
for different servers.
o The schema uses a few naming conventions - all object classes and
attributes are prefixed with "dhcp" and there are no object classes
and attributes that have the same name. The schema also uses stan-
dard naming attributes ("cn", "ou", etc) for all objects, though in
some cases the "cn" may be the same as another attribute already
defined on the object.
o Relationship to DEN/DMTF - This document takes into consideration
the object-oriented information model for representing Network
information (including DHCP information) currently under develop-
ment as part of the Common Information Model (CIM) activity in the
Distributed Management Task Force (DMTF). It should be noted that
the CIM schema is still under development and subject to change.
The DMTF efforts continue and draw upon the Directory-Enabled Net-
works (DEN) specification. The schema described in this Internet-
Draft is intended to be an LDAP implementation of the appropriate
objects in the DMTF model. The DMTF schema was used as a source
for defining certain terminology within this schema. For more
information see [DMTF] and [DEN].
o Relationship to Policy Framework working group - Much of the infor-
mation in this schema could be represented using the generalized
schema being developed by the Policy Framework. However, there
were two issues that we felt would make this a very complex and
most likely inefficient representation: (1) the complexity of the
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inheritance relationships between the dhcp policy objects defined
in this document and (2) the Policy Framework schema represents
each of the conditions and actions of a policy as separate objects.
However, it is still a fairly straightforward process to map the
objects from this schema into the Policy Framework Core Schema
objects. For more information see [POLICY].
4. Common Attributes
Although DHCP manages several different types of objects, the config-
uration of those objects is often very similar. Consequently, most
of these objects have a common set of attributes.
The dhcpConfigurableObject class is an auxiliary class which can be
used to associate the basic set of configuration attributes with
another object. Since some directories do not provide auxiliary
classes we have also repeated these common attributes in the defini-
tion of each of the DHCP object class definitions.
An implementation of this schema is not required to provide this aux-
iliary object class, but it SHOULD provide it if auxiliary classes
are supported. This is useful for associating DHCP configuration
settings for objects that are not directly defined as part of this
schema.
4.1. dhcpConfigurableObject Object Class
NAME dhcpConfigurableObject
DESCRIPTION A class that provides attributes for configuring
options and server parameters for DHCP.
TYPE Auxiliary
DERIVED FROM Top
POSSIBLE SUPERIORS ( )
MUST CONTAIN ( )
MAY CONTAIN ( dhcpOptionSetting dhcpParameterSetting
dhcpFieldSetting dhcpForcedOptions
dhcpIncludeOptionSet )
4.2. Common Attribute Definitions
NAME dhcpOptionSetting
DESCRIPTION Encoded option values to be sent to clients. Each value
represents a single option and contains (OptionTag,
Length, OptionValue) encoded in the 16-bit format used
by DHCP. For more information see [DHCPOPT].
SYNTAX OctetString MULTI-VALUE
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NAME dhcpParameterSetting
DESCRIPTION Encoded values of parameters that control server behav-
ior. Each value represents a single parameter setting
in the form (ParameterName, ParameterValue) where the
parameter name is a set of ASCII characters followed by
a space followed by the parameter value as a string.
SYNTAX IA5String MULTI-VALUE
NAME dhcpFieldSetting
DESCRIPTION Encoded settings of fields (such as siaddr, file) in the
DHCP message whose values may be configurable for send-
ing back to a client. For more information see
[RFC951]. Encoded in the form (FieldName, FieldValue)
where the field name is a set of ASCII characters fol-
lowed by a space followed by the field value as a
string.
SYNTAX IA5String MULTI-VALUE
NAME dhcpForcedOptions
DESCRIPTION This is a list of DHCP option tags that MUST be sent to
clients. If not specified, the server only sends the
options back to the client which were requested.
SYNTAX Integer MULTI-VALUE
NAME dhcpIncludeOptionSet
DESCRIPTION The distinguished name(s) of dhcpNamedOptionSet objects
whose settings should be included for this object. If
there are multiple option sets, the order is important
so each value is preceded by it's precedence, followed
by a colon as in "1:dn1", "2:dn2", etc. Settings
defined on the object take precedence over any settings
found in an included option set.
SYNTAX IA5String MULTI-VALUE
5. Configurations and Services
The DHC working group is currently considering several proposals for
failover and redundancy of DHCP servers. These may require the shar-
ing of configuration information between servers. This schema pro-
vides a generalized mechanism for supporting any of these proposals,
by separating the definition of a server from the definition of the
configuration being provided by the server.
By separating these two concepts, a configuration may be provided by
one or by several servers, and similarly, a server may provide one or
more configurations. The schema does allow for a server to be config-
ured as either a primary or secondary provider of a configuration.
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Configurations are also defined so that one configuration can include
some of the objects that are defined in another configuration (see
"dhcpIncludeObjects" attribute). This allows for sharing and/or a
hierarchy of related configuration items.
5.1. dhcpService Object Class
A "dhcpService" is a single instance of DHC server software running
on a computer system that provides the DHCP service defined by a
"dhcpConfiguration".
NAME dhcpService
DESCRIPTION This represents a single DHCP server.
TYPE Structural
DERIVED FROM Top
POSSIBLE SUPERIORS ( )
MUST CONTAIN ( cn )
MAY CONTAIN ( dhcpConfigurationDn dhcpImplementation )
5.1.1. dhcpService Attribute Definitions
NAME cn
DESCRIPTION The "common name" of the server. This does not have any
significance to the server process that provides the
DHCP service - it is simply a unique name used to refer
to the server. This attribute should be used as the
naming attribute when constructing the dn.
NAME dhcpConfigurationDn
DESCRIPTION The distinguished name(s) of the configurations provided
by the server.
SYNTAX DN MULTI-VALUE
NAME dhcpImplementation
DESCRIPTION This is a string value that identifies the hard-
ware/software platform and version which is providing
the service.
SYNTAX IA5String SINGLE-VALUE
5.2. dhcpConfiguration Object Class
A "dhcpConfiguration" is the collection of configuration information
that represents everything a server would need to know to provide DHC
service to some set of clients.
From the perspective of the schema, it is basically a collection of
objects. This object class is used to capture information common to
all the objects in a configuration. The algorithm used to locate all
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the objects in a configuration is discussed later.
NAME dhcpConfiguration
DESCRIPTION This represents a configuration, or a collection
of settings for related objects. A single ser-
vice may have multiple configurations. A config-
uration may be provided by multiple services, but
only one can be primary.
TYPE Structural
DERIVED FROM Top
POSSIBLE SUPERIORS ( )
MUST CONTAIN ( cn )
MAY CONTAIN ( dhcpPrimaryService dhcpSecondaryService
dhcpIncludeObjects dhcpOptionSetting
dhcpParameterSetting dhcpFieldSetting
dhcpForcedOptions dhcpIncludeOptionSet )
5.2.1. dhcpConfiguration Attribute Definitions
NAME cn
DESCRIPTION The "common name" of the configuration. This should be
used as the naming attribute when constructing the dn.
NAME dhcpPrimaryService
DESCRIPTION The "dhcpService" which is the primary for the configu-
ration.
SYNTAX DN SINGLE-VALUE
NAME dhcpSecondaryService
DESCRIPTION The "dhcpService(s)" which provide backup for the con-
figuration.
SYNTAX DN MULTI-VALUE
NAME dhcpIncludeObjects
DESCRIPTION This attribute defines objects that are included in a
configuration. Each value is an LdapURL [RFC2255]
(specifying search criteria) that is evaluated to find
other objects that are included in this configuration.
Note that in addition to these objects, all objects that
are children of the configuration object in the direc-
tory are automatically included in the configuration.
SYNTAX IA5String MULTI-VALUE
6. Policy Objects
Most of a DHCP configuration is the definition of policies that gov-
ern the assignment of DHCP options and addresses to clients. This
schema defines a set of object classes which are common to most
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server implementations for defining these policies. All of these
object classes are based on a higher level abstraction that repre-
sents a dhcp policy.
This is done for several reasons: it simplifies the organization of
the data and it also facilitates a mapping of the dhcp schema into
the work being developed in the Policy Framework working group. This
is discussed in more detail in a later section.
This schema separates the definition of a policy for an object from
the object itself. This allows for the definition of multiple poli-
cies for an object (possibly in multiple dhcp configurations). How-
ever, the policy object does maintain a link back to the original
object (see the "dhcpSourceObject" attribute).
The structure of a "source object" is not defined in this schema. It
can be any LDAP object, and it is not required to even exist. How-
ever, if it does exist that object can use the "dhcpConfigurableOb-
ject" auxiliary class to directly associate dhcp configuration infor-
mation with that object. If an object is defined in this way, this
information is used on every policy that references the object.
Furthermore, the policy objects in the directory can be organized in
a hierarchical fashion. If objects are organized this way, the
"child" policy object inherits settings from the "parent" policy
object. This can be done recursively. Furthermore, the "child" pol-
icy object inherits any conditions from the "parent" policy as well.
This means that the "child" policy's settings will only be used when
both sets of conditions are met.
As an example, if a "dhcpClass" is a child of a "dhcpSubnet" then the
settings for that class will only be used if the client request is a
member of that class AND it is also from the specified subnet.
The algorithm for resolving which option settings are applied for a
policy object is defined in a later section.
6.1. dhcpPolicy Object Class
The "dhcpPolicy" class is an abstract class that defines attributes
that are common to the DHCP configuration objects that define these
policies.
This class is the base class from which others are derived. Also
note that it includes all the attributes from the dhcpConfigurableOb-
ject class.
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NAME dhcpPolicy
DESCRIPTION The base class for defining policies for address
and option assignment.
TYPE Abstract
DERIVED FROM Top
POSSIBLE SUPERIORS ( )
MUST CONTAIN ( cn dhcpPolicyType )
MAY CONTAIN ( dhcpPoolName dhcpSubnetName
dhcpSharedNetworkName dhcpClientIdentifier
dhcpClassName dhcpVendorCondition
dhcpSourceObject dhcpOptionSetting
dhcpParameterSetting dhcpFieldSetting
dhcpForcedOptions dhcpIncludeOptionSet )
6.2. dhcpPolicy Attribute Definitions
NAME cn
DESCRIPTION The "common name" of the policy. This should be used as
the naming attribute when constructing the dn.
NAME dhcpPolicyType
DESCRIPTION The type of the policy. This should be one of 'POOL',
'SUBNET', 'SHAREDNETWORK', 'CLIENT', 'CLASS' unless the
server implementation extends this with a new policy
type.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpPoolName
DESCRIPTION A descriptive name of the pool for this policy.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpSubnetName
DESCRIPTION A descriptive name of the subnet for this policy.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpClientIdentifier
DESCRIPTION The DHCP client identifier for the client. This is
encoded in the binary format used for dhcp option 61 -
the first octet is the ARP hardware type, followed by
the link layer (or MAC) address. If the value is an
arbitrary identifier (instead of a MAC address) then the
first octet is 0. For more information see [RFC2132].
SYNTAX OctetString SINGLE-VALUE
NAME dhcpClassName
DESCRIPTION The name of the class for the policy.
SYNTAX IA5String SINGLE-VALUE
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NAME dhcpVendorCondition
DESCRIPTION If the server extends the policy types, this attribute
MAY be used to specify the conditions under which the
policy should be applied. The content of this attribute
is defined by the vendor/server implementation.
SYNTAX IA5String MULTI-VALUE
NAME dhcpSourceObject
DESCRIPTION If the policy applies to an object that is defined else-
where in the directory, this attribute has the distin-
guished name of that object.
SYNTAX DN SINGLE-VALUE
6.3. dhcpPool Object Class
A "dhcpPool" represents a policy for a collection of addresses speci-
fied by one or more ranges of addresses. If there are multiple
ranges specified, they do not need to be contiguous, and it is not
required that all the addresses be contained on the same IP subnet.
The "dhcpPolicyType" attribute MUST be set to 'POOL', and the "cn"
SHOULD be set to the value of the "dhcpPoolName" attribute".
NAME dhcpPool
DESCRIPTION This stores configuration information about one
(or more) ranges of addresses.
TYPE Structural
DERIVED FROM dhcpPolicy
POSSIBLE SUPERIORS ( OrganizationalUnit dhcpPolicy )
MUST CONTAIN ( cn dhcpPoolName dhcpAddressRange )
MAY CONTAIN ( )
6.3.1. dhcpPool Attribute Definitions
NAME dhcpAddressRange
DESCRIPTION The starting & ending IP Addresses in the range (inclu-
sive), separated by a hyphen. Each range is defined as
a separate value.
SYNTAX IA5String MULTI-VALUE
6.4. dhcpSubnet Object Class
A "dhcpSubnet" represents a policy for an IP subnet.
The "dhcpPolicyType" attribute MUST be set to 'SUBNET', and the "cn"
SHOULD be set to the value of the "dhcpSubnetName" attribute".
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NAME dhcpSubnet
DESCRIPTION This class defines a subnet.
TYPE Structural
DERIVED FROM dhcpPolicy
POSSIBLE SUPERIORS ( OrganizationalUnit dhcpPolicy )
MUST CONTAIN ( cn dhcpSubnetAddress dhcpSubnetMaskLength
dhcpSubnetName )
MAY CONTAIN ( )
6.4.1. dhcpSubnet Attribute Definitions
NAME dhcpSubnetAddress
DESCRIPTION The network address for the subnet.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpSubnetMaskLength
DESCRIPTION The subnet mask length for the subnet. The mask can be
easily computed from this length.
SYNTAX Integer SINGLE-VALUE
6.5. dhcpSharedNetwork Object Class
A "dhcpSharedNetwork" represents a policy for multiple subnets on the
same physical cabling.
The "dhcpPolicyType" attribute MUST be set to 'SHAREDNETWORK', and
the "cn" SHOULD be set to the value of the "dhcpSharedNetworkName"
attribute".
NAME dhcpSharedNetwork
DESCRIPTION This represents multiple subnets on the same
physical cabling.
TYPE Structural
DERIVED FROM dhcpPolicy
POSSIBLE SUPERIORS ( OrganizationalUnit dhcpPolicy )
MUST CONTAIN ( cn dhcpSharedNetworkName )
MAY CONTAIN ( )
6.6. dhcpClient Object Class
The "dhcpClient" object class is used to store configuration informa-
tion related to a specific host.
The "dhcpPolicyType" attribute MUST be set to 'CLIENT', and the "cn"
SHOULD be set to the value of the "dhcpClientIdentifier" attribute".
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NAME dhcpClient
DESCRIPTION This represents client-specific DHCP policies.
TYPE Structural
DERIVED FROM dhcpPolicy
POSSIBLE SUPERIORS ( OrganizationalUnit dhcpPolicy )
MUST CONTAIN ( cn dhcpClientIdentifier )
MAY CONTAIN ( dhcpClassMember )
6.6.1. dhcpClient Attribute Definitions
NAME dhcpClassMember
DESCRIPTION This attribute indicates that the client is a member of
the specified class(es).
SYNTAX IA5String MULTI-VALUE
6.7. dhcpClass Object Class
A "dhcpClass" represents information about a collection of clients.
The DHC protocol provides 2 mechanisms for managing this information
(User Class and Vendor Class). The schema also provides 2 additional
mechanisms for configuring groups of clients that are supported by
some servers. Clients may be explicitly added to a class by setting
the "dhcpClassMember" attribute in the "dhcpClient" object class.
Some servers also support forms of dynamic class membership beyond
the User Class and Vendor Class mechanisms - setting the "dhcpVendor-
Condition" attribute allows for the definition of dynamic classes.
The "dhcpPolicyType" attribute MUST be set to 'CLASS', and the "cn"
SHOULD be set to the value of the "dhcpClassName" attribute".
NAME dhcpClass
DESCRIPTION Represents information about a collection of
related clients.
TYPE Structural
DERIVED FROM dhcpPolicy
POSSIBLE SUPERIORS ( OrganizationalUnit dhcpPolicy )
MUST CONTAIN ( cn dhcpClassName )
MAY CONTAIN ( dhcpClassType )
6.7.1. dhcpClass Attribute Definitions
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NAME dhcpClassType
DESCRIPTION This attribute indicates the type of the class. It
should be one of 'USERCLASS', 'VENDORCLASS', 'STATIC'
(the only members of the class are enumerated clients),
'DYNAMIC' (membership is determined by some vendor-spe-
cific conditions).
SYNTAX IA5String SINGLE-VALUE
7. Other Configuration objects
Many server implementations provide other objects that simplify the
configuration of the DHCP protocol. One example is the ability to
assign a name to a group of option settings and then to refer to the
entire group of settings by referencing the name. This is addressed
by the "dhcpNamedOptionSet" object class.
It is also fairly common for server implementations to allow users to
extend the default set of options with site specific option defini-
tions. This is addressed by the "dhcpDictionary" object class. This
object class is also used to define the implementation-specific
parameters (and their values) that can be specified in the "dhcpPa-
rameterSetting" attribute.
7.1. dhcpNamedOptionSet Object Class
A "dhcpNamedOptionSet" is an object class for associating a name with
a collection of option settings. The entire set of options can be
associated with a DHCP object by referring to the name. This allows
a common set of option settings to be re-used without repeating the
option settings on each configured object. To see how an option set
is referenced, see the "dhcpIncludeOptionSet" attribute.
NAME dhcpNamedOptionSet
DESCRIPTION This is a named collection of settings for
options and/or server parameters.
TYPE Structural
DERIVED FROM Top
POSSIBLE SUPERIORS ( OrganizationalUnit )
MUST CONTAIN ( cn )
MAY CONTAIN ( dhcpOptionSetting dhcpParameterSetting
dhcpFieldSetting dhcpForcedOptions
dhcpIncludeOptionSet )
7.1.1. dhcpDictionary Object Class
"dhcpDictionary" objects define the options and/or parameters that
can be set when configuring various DHCP entities.
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NAME dhcpDictionary
DESCRIPTION This class defines an option or parameter that
can have a value.
TYPE Structural
DERIVED FROM Top
POSSIBLE SUPERIORS ( OrganizationalUnit )
MUST CONTAIN ( cn )
MAY CONTAIN ( dhcpKeyword dhcpTag dhcpDataType dhcpDefault
dhcpMultiValued dhcpDescription dhcpLegalValues
dhcpTypeRestriction dhcpImplementation )
7.2. dhcpDictionary Attribute Definitions
NAME cn
DESCRIPTION The "common name" of the option or parameter. This will
usually be the same as the "dhcpKeyword" attribute.
SYNTAX Integer SINGLE-VALUE
NAME dhcpKeyword
DESCRIPTION This is a string tag (or keyword) that is used to iden-
tify the option or parameter.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpTag
DESCRIPTION The numeric tag that identifies an option. This MUST be
defined for options, but is not required for parameters.
SYNTAX Integer SINGLE-VALUE
NAME dhcpDataType
DESCRIPTION The data type for values of this option. The set of
valid data types are defined by the DHCP protocol. For
more information see [RFC2131].
SYNTAX Integer SINGLE-VALUE
NAME dhcpDefault
DESCRIPTION Indicates the default value of a parameter or option
definition in a dictionary object. This is encoded as
it would be in the "dhcpOptionSetting" or "dhcpParame-
terSetting" attribute.
SYNTAX OctetString SINGLE-VALUE
NAME dhcpMultiValued
DESCRIPTION Indicates whether the parameter or option can have more
than one value.
SYNTAX Boolean SINGLE-VALUE
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NAME dhcpDescription
DESCRIPTION A textual description of an object.
SYNTAX String SINGLE-VALUE
NAME dhcpLegalValues
DESCRIPTION The list of allowed values for the option or parameter.
Each "legal value" is stored as a separate value for the
attribute, and each one is encoded as it would be in the
"dhcpOptionSetting" or "dhcpParameterSetting" attribute.
SYNTAX OctetString MULTI-VALUE
NAME dhcpTypeRestriction
DESCRIPTION This attribute is used to specify that the option or
parameter should only be used with specific types of
policies. This is restricted to the same set of values
as the "dhcpPolicyType" attribute.
SYNTAX IA5String MULTI-VALUE
NAME dhcpImplementation
DESCRIPTION This attribute is used to specify that the option or
parameter should only be used with specific server
implementations.
SYNTAX IA5String MULTI-VALUE
8. Tracking Addresses
The behavior of a DHCP server is influenced by two factors - it's
configuration and the current state of the addresses that have been
assigned to clients. This schema defined a set of objects for stor-
ing the configuration of the server, and the following object class
provides the ability to record how addresses are used.
8.1. dhcpAddress Object Class
This class represents an IP address. It may or may not be leaseable,
and the object may exist even though a lease is not currently active
for the associated IP address.
Note that this object class has some of the "Settings" attributes
that are defined for the "dhcpConfigurableObject", but they are not
used for configuration - only for tracking the settings that were
assigned to the client. It is not required that the server implemen-
tation record options that were offered to the client.
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NAME dhcpAddress
DESCRIPTION This class represents an IP Address, which may or
may not have been leased.
TYPE Structural
DERIVED FROM Top
POSSIBLE SUPERIORS ( )
MUST CONTAIN ( cn dhcpAddressType dhcpAddressState )
MAY CONTAIN ( dhcpExpirationTime dhcpStartTimeOfState
dhcpLastTransactionTime dhcpBootpFlag
dhcpDomainName dhcpDnsStatus
dhcpRequestedHostName dhcpAssignedHostName
dhcpReservedForClient dhcpAssignedToClient
dhcpRelayAgentInfo dhcpOptionSetting
dhcpParameterSetting dhcpFieldSetting )
8.2. dhcpAddress Attribute Definitions
NAME cn
DESCRIPTION The IP address, as a string.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpAddressType
DESCRIPTION This describes how the address is to be assigned to a
client. One of 'UNKNOWN', 'DYNAMIC', 'FIXED', 'UNAS-
SIGNED', 'NOTASSIGNABLE'.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpAddressState
DESCRIPTION This stores information about the current binding-status
of an address, using the states defined in the safe-
failover draft. For more information see [FAILOVR].
SYNTAX Integer SINGLE-VALUE
NAME dhcpExpirationTime
DESCRIPTION This is the time the current lease for an address
expires.
SYNTAX DateTime SINGLE-VALUE
NAME dhcpStartTimeOfState
DESCRIPTION This is the time of the last state change for a leased
address.
SYNTAX DateTime SINGLE-VALUE
NAME dhcpLastTransactionTime
DESCRIPTION This is the last time a valid DHCP packet was received
from the client.
SYNTAX DateTime SINGLE-VALUE
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NAME dhcpBootpFlag
DESCRIPTION This indicates whether the address is assigned via BOOTP
SYNTAX Boolean SINGLE-VALUE
NAME dhcpDomainName
DESCRIPTION This is the name of the domain assigned to the client by
the server.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpDnsStatus
DESCRIPTION This indicates which resource records were added to the
domain on behalf of the client by the DHCP server. The
allowed values are: "No DNS Activity", "Update A
Records", "Update PTR Records", and "Update Both A and
PTR Records"
SYNTAX Integer SINGLE-VALUE
NAME dhcpRequestedHostName
DESCRIPTION This is the hostname that was requested by the client.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpAssignedHostName
DESCRIPTION This is the actual hostname that was assigned to a
client. It may not be the name that was requested by the
client. The fully qualified domain name can be deter-
mined by appending the value of "dhcpDomainName" (with a
dot separator) to this name.
SYNTAX IA5String SINGLE-VALUE
NAME dhcpReservedForClient
DESCRIPTION The distinguished name of a "dhcpClient" that an address
is reserved for. This may not be the same as the "dhc-
pAssignedToClient" attribute if the address is being
reassigned but the current lease has not yet expired.
SYNTAX DN SINGLE-VALUE
NAME dhcpAssignedToClient
DESCRIPTION This is the distinguished name of a "dhcpClient" that an
address is currently assigned to. This only has a value
when the address is leased.
SYNTAX DN SINGLE-VALUE
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NAME dhcpRelayAgentInfo
DESCRIPTION If the client request was received via a relay agent,
this contains information about the relay agent that was
available from the DHCP request. This is a hex-encoded
option value. For more information see [RELAY].
SYNTAX OctetString SINGLE-VALUE
9. Object Containment
These diagrams depict the containment hierarchy of the objects.
<Administrative-Container> can be any LDAP object.
<Administrative-Container>
|
+---dhcpConfiguration
|
+--- ou = OptionDictionary
| |
| +---dhcpDictionary
|
+--- ou = ParameterDictionary
| |
| +---dhcpDictionary
|
+--- ou = NamedOptionSets
| |
| +---dhcpNamedOptionSet
|
+--- ou = Policies
| |
| +---dhcpPolicy
| |
| +---dhcpPolicy . . .
|
+--- ou = Addresses
|
+---dhcpAddress
<Administrative-Container>
|
+---dhcpService
10. Object Class Inheritance
The following diagram shows the inheritance hierarchy of the classes:
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Top
|
+---dhcpDictionary
|
+---dhcpService
|
+---dhcpConfiguration (aux: dhcpConfigurableObject)
|
+---dhcpNamedOptionSet (aux: dhcpConfigurableObject)
|
+---dhcpAddress (aux: dhcpConfigurableObject)
|
+---dhcpPolicy (aux: dhcpConfigurableObject)
|
+---dhcpClass
|
+---dhcpClient
|
+---dhcpPool
|
+---dhcpSharedNetwork
|
+---dhcpSubnet
11. Determining Policy settings
This section of the document defines the algorithm that should be
used for determining the settings for options and/or parameters for a
policy. Most DHCP server implementations provide for some degree of
inheritance of options between configuration objects. This algorithm
is both flexible enough to allow server implementations to represent
their existing behavior.
The option settings directly associated with a "dhcpPolicy" object
MUST take precedence over all other option settings. The policy also
inherits options from the following objects (in order of precedence):
- options from one or more included "dhcpNamedOptionSet" objects, as
defined in the "dhcpIncludeOptionSet" attribute. If there is more
than one option set, the attribute values define the order in which
the option sets should be included.
- options from the "dhcpSourceObject" for the policy.
- options from "dhcpNamedOptionSet" objects associated with the
"dhcpSourceObject" for the policy.
- options from the "parent" policy (only if the object's parent in
the directory is also a "dhcpPolicy" object.
- options from "dhcpNamedOptionSet" objects associated with the "par-
ent" policy.
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- options from walking up the directory hierarchy inheriting from
ancestor policies until the "dhcpConfiguration" object is reached.
12. Policy Framework Schema Mapping
This section of the document provides a mapping to the Policy Frame-
work Core schema being developed by the Policy Framework working
group.
The Policy Framework Core schema provides a general representation of
policies. Mapping the "dhcpPolicy" objects in this schema to that
general model is a fairly straightforward exercise. For the most
part each "dhcpPolicy" maps directly into a "policyRule" object from
the Core schema.
When a dhcpPolicy has a value for any of the following attributes: {
"dhcpPoolName", "dhcpSubnetName", "dhcpSharedNetworkName", "dhcpCli-
entIdentifier", "dhcpClassName", "dhcpVendorCondition" } this would
be mapped into a "policyCondition" object. Values for the { "dhcpOp-
tionSetting", "dhcpParameterSetting", "dhcpFieldSetting", "dhcpForce-
dOptions", "dhcpIncludeOptionSet" } attributes would be mapped into
"policyAction" objects.
13. CIM Mapping
This section of the document provides a mapping to the CIM (Common
Information Model) DHCP Schema defined by the DMTF.
13.1. dhcpConfigurableObject
The DMTF Schema maps the setting and parameter data in the dhcpCon-
figurableObject class using instances of CIM_Setting classes and
associations.
The individual dhcpOption, Parameter and Field Settings are instances
of the CIM_DHCPSetting class (derived from CIM_Setting). The
CIM_DHCPSetting class defines key properties and an octet string to
hold the OptionData. The CIM_DHCPSetting instances are associated
with the various subclasses of dhcpConfigurableObject using the
CIM_ElementSetting, CIM_SettingContext or CIM_CollectionSetting rela-
tionships. (Which association is used depends on the derivation of
the dhcpConfigurableObject in the CIM class hierarchy.)
The individual dhcpConfigurations and dhcpIncludeOptionSets are
instances of the CIM_DHCPConfiguration class or of its subclass,
CIM_DHCPOptionConfiguration (both classes were discussed earlier in
this document). The CIM_DHCPConfiguration instances are associated
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with the various subclasses of dhcpConfigurableObject using the
CIM_ElementConfiguration, CIM_ConfigurationComponent or CIM_Collec-
tionConfiguration relationships. (As above, the association that to
be used depends on the derivation of the dhcpConfigurableObject in
the CIM class hierarchy.)
dhcpForcedOptions is mapped to the CIM_DHCPForcedOptions class
(derived from CIM_Setting). CIM_DHCPForcedOptions defines key prop-
erties and an integer array to hold the option tags being "forced".
It is associated with the various subclasses of dhcpConfigurableOb-
ject using the CIM_ElementSetting, CIM_SettingContext or CIM_Collec-
tionSetting relationships. (As above, the association that is used
depends on the derivation of the dhcpConfigurableObject in the CIM
class hierarchy.)
Since the CIM_DHCPSetting and CIM_DHCPForcedOptions classes were not
discussed previously, a brief overview of their properties is needed.
Both classes contain only key properties for identification, plus one
additional property in each object. The CIM_DHCPSetting class has an
octet string to hold the option, parameter or field data. The
CIM_DHCPForcedOptions class has an integer array holding option tags.
The key properties of CIM_DHCPSetting and CIM_DHCPForcedOptions are:
- ConfiguredObject, a string identifying the entity to which the
Setting or ForcedOptions applies
- SettingID, a string identifier for the instance
- For CIM_DHCPSetting only, a SettingType enumerated integer defin-
ing whether an option, parameter or field setting is specified.
These string properties taken together form the objects' key and con-
ceptually are a DN.
13.2. Configurations and Services
13.2.1. dhcpService
The DMTF Schema specifies a CIM_DHCPService object (derived from
CIM_Service) that corresponds to dhcpService. In CIM, Services are
defined and named relative to the System that hosts them. Therefore,
the keys of CIM_DHCPService are defined as:
- The hosting System's CreationClassName (for example, CIM_Uni-
taryComputerSystem) and Name.
- The Service's CreationClassName (= "CIM_DHCPService") and Name.
These string properties taken together form the object's key and con-
ceptually are a DN.
That CIM_DHCPService is named and scoped by a CIM_System is consis-
tent with the definition of a <Computer> as a "possible superior" of
dhcpService. In CIM, this relationship is described using the
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CIM_HostedService association.
CIM_DHCPService also contains the following properties:
- Description and Caption strings (inherited from CIM_ManagedSys-
temElement)
- ImplementationMatchingStrings, an array of strings
- Numerous other properties defining runtime characteristics of the
DHCP Service. For example, whether or not the Service provides
ProxyDNSSupport (a boolean) or the BootPLeaseLength (a uint32)
are properties of CIM_DHCPService.
The dhcpServiceName string can be mapped into the CIM_DHCPService
class' Name property, if the uniqueness characteristics of CIM naming
are satisfied. Otherwise, it should be mapped into the Caption
string. And, the dhcpImplementation multi-valued string can be
mapped into the ImplementationMatchingStrings property.
The dhcpConfiguration property is mapped to an association, CIM_Ser-
viceForDCHPConfiguration, in the DMTF Schema. This association was
explained above.
13.2.2. dhcpConfiguration
The DMTF Schema defines a CIM_DHCPConfiguration object (derived from
CIM_Configuration) that corresponds to dhcpConfiguration. The CIM
class has the following properties:
- A Name string that is the object's key, and conceptually is a DN
- Description and Caption strings
The dhcpConfigurationName string is mapped into the CIM_DHCPConfigu-
ration class' Name property, if it satisfies the uniqueness charac-
teristics of CIM naming. Otherwise, it should be mapped into the
Caption property.
The remainder of the dhcpConfiguration properties are mapped to asso-
ciations in the DMTF Schema. The correspondence is as follows:
- dhcpPrimaryService and dhcpSecondaryService map to the CIM_Ser-
viceForDHCPConfiguration association. This association ties
together a CIM_DHCPConfiguration and a CIM_DHCPService, and
includes a boolean property to identify the PrimaryService.
- dhcpParentConfiguration (subsetted by the dhcpIncludeFromParent
property) is defined by instantiating various CIM_DHCPConfigura-
tion objects and then grouping them using the CIM_Configura-
tionComponent relationship. The aggregation in CIM defines the
parts or components of the parent, as opposed to the LDAP DHCP
Schema which defines the parent and then subsets it.
The dhcpLocator property is unique to the LDAP Schema and has no CIM
correspondence.
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13.3. Policy Objects
13.3.1. dhcpPool
Different than the LDAP schema, the DMTF Schema defines a CIM_IPAd-
dressRange entity to uniquely identify and manipulate ranges. The
key properties of the class are its start and end addresses.
CIM_IPAddressRanges can be aggregated into CIM_RangeGroups using the
CIM_CollectionOfRanges association.
Regarding dhcpSubnet being a "possible superior" of dhcpPool, this is
mapped in the DMTF Schema using the CIM_RangeGroupInSubnet aggrega-
tion association.
13.3.2. dhcpSubnet
The DMTF Schema specifies a CIM_IPSubnet object (derived from
CIM_LogicalNetwork) that corresponds to the dhcpSubnet class. The
property correspondence is as follows:
- dhcpIpAddress = CIM_IPSubnet.SubnetNumber
- dhcpSubnetMaskLength = (mapping is not 1 to 1 in that CIM_IPSub-
net specifies the complete mask, as the SubnetMask property)
- dhcpSubnetName = CIM_IPSubnet.Name, inherited from CIM_Logical-
Network and part of the key structure for the class
The dhcpSubnetName string can be mapped into the CIM_DHCPService
class' Name property, only if the uniqueness characteristics of CIM
naming are satisfied. Otherwise, it should be mapped into the Cap-
tion property.
Participation in a SharedNetwork (indicated by the dhcpSharedNetwork
attribute in the LDAP Schema) is indicated by the CIM_SubnetInShared-
Network aggregation. This association would relate an instance of
CIM_IPSubnet and an instance of CIM_SharedNetwork.
Regarding dhcpSubnet being a "possible superior" of another Subnet,
this is mapped in the DMTF Schema using the CIM_SubnetInSubnet aggre-
gation association.
13.3.3. dhcpSharedNetwork
CIM_SharedNetwork (subclassed from CIM_CollectionOfMSEs) is defined
in the DMTF Schema to correspond to the dhcpSharedNetwork class. A
property of the CIM_SharedNetwork class, Name (its key), maps the
dhcpSharedNetworkName information. This mapping is allowed if the
dhcpSharedNetworkName satisfies the uniqueness characteristics of CIM
naming. Otherwise, the Name data should be mapped into the
CIM_SharedNetwork.Caption property, inherited from
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CIM_CollectionOfMSEs.
13.3.4. dhcpClient
The DMTF Schema defines a CIM_DHCPClientEndpoint object (derived from
CIM_ProtocolEndpoint) that corresponds to dhcpClient. The CIM class
maps the LDAP Schema properties as follows:
- dhcpClientIdentifier = DHCPClientID string
- dhcpUserClass = UserClass string array
- dhcpVendorClass = VendorClass string
- dhcpCharacteristics = Characteristics string array
- dhcpCreatedByServer = CreatedForUnlistedClient boolean
The remainder of the dhcpClient properties are mapped to associations
in the DMTF Schema. The correspondence is as follows:
- Information in dhcpAssignedAddress is mapped to the CIM_DHCPAd-
dressAssignment association, relating CIM_DHCPClientEndpoint and
CIM_DHCPAllocatedEndpoint (as discussed in Section 3.2.1)
- Information in dhcpMemberOfGroup is mapped to the CIM_DHCPEnd-
pointCollection association, relating CIM_DHCPClientEndpoint and
CIM_DHCPClientCollection (as discussed in Section 3.3
To identify instances of CIM_DHCPClientEndpoint, key (naming) proper-
ties are needed. Names are defined relative to the System that hosts
the Endpoints. So, the keys of any CIM_ProtocolEndpoint are specified
as:
- The hosting System's CreationClassName (for example, CIM_Uni-
taryComputerSystem) and Name,
- The ProtocolEndpoint's CreationClassName (= "CIM_DHCPClientEnd-
point") and Name.
These string properties taken together form the object's key and con-
ceptually are a DN.
13.3.5. dhcpClass
The DMTF Schema defines CIM_DHCPClientCollection (derived from
CIM_CollectionOfMSEs) to correspond to dhcpClass. In the CIM_DHCP-
ClientCollection object, UserClass and VendorClass information is
individually called out (addressing the DHC protocol mechanisms for
determining a collection of clients). Also, it is permissible to
define other membership Characteristics, as well as to specify
explicit membership. In CIM, properties can be left unde-
fined/unspecified. Therefore, if the UserClass, VendorClass or other
Characteristics are not applicable, they can be left NULL (unde-
fined).
The mapping of properties from dhcpClass to CIM_DHCPClientCollection
is straightforward.
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- dhcpClassName corresponds to the CIM_DHCPClientCollection's Name
property ( if CIM naming requirements for uniqueness are met).
Otherwise, dhcpClassName should be mapped into the Caption prop-
erty, inherited from CIM_CollectionOfMSEs.
- dhcpClassType is mapped to the CollectionType enumeration.
- dhcpClassCharacteristics corresponds to the Characteristics
string array property.
- dhcpUserClass and dhcpVendorClass map to the UserClass and Ven-
dorClass string arrays, respectively.
Explicit membership by a client in a particular instance of CIM_DHCP-
ClientCollection is specified using the CIM_DHCPEndpointCollection
aggregation association. (In the LDAP Schema, this is defined by
placing the DN of the dhcpClass in the client's dhcpMemberOfGroup
attribute.) CIM_DHCPEndpointCollection is also useful when enumerat-
ing the client members of a Collection, after evaluation of the User-
Class, VendorClass and Characteristics requirements.
Regarding dhcpConfiguration as a "possible superior" for dhcpClass,
this is mapped in the DMTF Schema as an instance of the CIM_Collec-
tionConfiguration association. The association would be instantiated
to reference the CIM_DHCPClientCollection and the appropriate
CIM_DHCPConfiguration.
13.4. Other Configuration Objects
13.4.1. dhcpNamedOptionSet
In the DMTF Schema, the CIM_DHCPOptionConfiguration object corre-
sponds to the dhcpNamedOptionSet class. dhcpOptionSetName is mapped
into the Name property (a key property) of the CIM class. This is
acceptable if dhcpOptionSetName meets CIM's requirements for unique-
ness. Otherwise, its data should be placed into the Caption prop-
erty, inherited from CIM_Configuration.
If the instance of CIM_DHCPOptionConfiguration is part of a higher
level CIM_DHCPConfiguration, this is indicated by instantiating the
CIM_ConfigurationComponent association and referencing both Configu-
rations.
13.4.2. dhcpDictionary
The DMTF Schema defines a CIM_DHCPOptionDictionary object (derived
from CIM_Setting) that corresponds to dhcpOptionDictionary.
Instances of CIM_DHCPOptionDictionary may be grouped by CIM_DHCPCon-
figurations using the CIM_SettingContext association. This associa-
tion aggregates one or more Settings into a Configuration, and corre-
sponds to the definition of dhcpConfiguration as a "possible
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superior" of dhcpOptionDictionary. It also is the mapping for the
dhcpConfigurationName string attribute.
The property values of the CIM_DHCPOptionDictionary class map one-to-
one to those of dhcpOptionDictionary. The explicit mapping is:
- dhcpOptionName = OptionName string
- dhcpOptionTag = OptionTag uint32
- dhcpDataType = DataType enumeration
- dhcpMultiValued = MultiValued boolean
- dhcpDefault = DefaultValue octet string
- dhcpVendorClass = VendorClass string
- dhcpDescription = Description string, inherited from CIM_Setting
- dhcpLegalValues = LegalValues octet string
- dhcpTypeRestriction = RestrictedTo enumerated integer array
To identify instances of CIM_DHCPOptionDictionary, one or more key
(naming) properties are needed. The key of CIM_DHCPOptionDictionary
is specified as its SettingID (a string). This property conceptually
is a DN.
13.5. Tracking Addresses
13.5.1. dhcpAddress
The DMTF Schema defines a CIM_DHCPAllocatedEndpoint (a subclass of
CIM_ProtocolEndpoint) that corresponds to the dhcpAddress class.
However, in CIM, to obtain all the data for an IP address, one must
examine several classes. These are:
- CIM_DHCPAllocatedEndpoint containing lease specific information
- CIM_IPProtocolEndpoint containing address specific data, such as
address type and IP version support
- CIM_EndpointIdentity, an association instantiated between the
CIM_DHCPAllocatedEndpoint and CIM_IPProtocolEndpoint, to tie
together these different aspects of the same address
- CIM_DHCPAddressAssignment, an association relating a CIM_DHCPAl-
locatedEndpoint with a DHCP client
Mapping the dhcpAddress properties into the DMTF Schema results in
the following list:
- dhcpIPAddress = CIM_DHCPAllocatedEndpoint.Address string
- dhcpAddressType = CIM_DHCPAllocatedEndpoint.DHCPAddressType enu-
meration
- dhcpAddressState = CIM_DHCPAllocatedEndpoint.AddressState enumer-
ation
- dhcpDomainName = CIM_DHCPAllocatedEndpoint.DomainName string
- dhcpLastTransactionTime = CIM_DHCPAllocatedEndpoint.LastTransac-
tionTime datetime
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- dhcpExpirationTime = CIM_DHCPAllocatedEndpoint.Expiration date-
time
- dhcpStartTimeOfState = CIM_DHCPAllocatedEndpoint.TimeOfLastState-
Change datetime
- dhcpRequestedHostName = CIM_DHCPAllocatedEnd-
point.RequestedDNSName string
- dhcpBootpFlag = CIM_DHCPAllocatedEndpoint.BootPAddress boolean
- dhcpAssignedHostName = CIM_DHCPAllocatedEndpoint.AssignedDNSName
string
- dhcpDnsStatus = CIM_DHCPAllocatedEndpoint.DNSStatus enumeration
- dhcpReservedForClient = An instance of the CIM_DHCPAddressAssign-
ment association with the Reserved boolean set to TRUE
- dhcpAssignedToClient = An instance of the CIM_DHCPAddressAssign-
ment association indicating the current lease assignment
- dhcpRelayAgentInfo = CIM_DHCPAllocatedEndpoint.RelayAgent octet
string
To identify CIM_IPProtocolEndpoint or CIM_DHCPAllocatedEndpoint
instances, key (naming) properties are needed. Names are defined rel-
ative to the System that hosts the Endpoints. So, the keys of any
CIM_ProtocolEndpoint are specified as:
- The hosting System's CreationClassName (for example, CIM_Uni-
taryComputerSystem) and Name.
- The ProtocolEndpoint's CreationClassName (= "CIM_IPProtocolEnd-
point" or "CIM_DHCPAllocatedEndpoint") and Name.
These string properties taken together form the object's key and con-
ceptually are a DN.
Any instances of CIM_ProtocolEndpoints (or instances of its sub-
classes) can be members of CIM_LogicalNetworks. This is specified
using the CIM_InLogicalNetwork association. Using this association,
one can relate CIM_DHCPAllocatedEndpoints and CIM_IPProtocolEnd-
points to a CIM_IPSubnet. The InLogicalNetwork association becomes
the mapping for the dhcpSubnet "possible superior" relationship to
dhcpAddress.
14. References
[RFC2131] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131,
March 1997.
[RFC2132] Alexander, S., Droms, R., "DHCP Options and BOOTP Vendor
Extensions", RFC 2132, March 1997.
[DMTF] Distributed Management Task Force, "Common Information
Model (CIM) Specification", Version 2.0, Mar 1998.
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Internet Draft DHCP Schema for LDAP October 1999
[DEN] Strassner, J., "Directory-Enabled Networks, Information
Model and Base Schema", DEN Specification v3.0c, July 1998.
[MSDHCP] Gu, Y., Vyaghrapuri, R., "An LDAP Schema for Dynamic Host
Configuration Protocol Service", Internet Draft
<draft-gu-dhcp-ldap-schema-00.txt>, August 1998.
[NOVDHCP] Miller, T., Patel, A., Rao, P., "Lightweight Directory
Access Protocol (v3): Schema for Dynamic Host Configuration
Protocol (DHCP)", Internet Draft
<draft-miller-dhcp-ldap-schema-00.txt>, June 1998.
[FAILOVR] Droms, R., Rabil, G., Dooley, M., Kapur, A., Gonczi, S.,
Volz, B., "DHCP Failover Protocol", Internet Draft
<draft-ietf-dhc-failover-03.txt>, November 1998.
[RELAY] Patrick, M., "DHCP Relay Agent Information Option", Inter-
net Draft <draft-ietf-dhc-agent-options-05.txt>, November
1998.
[DHCPOPT] Carney, M., "New Option Review Guidelines and Additional
Option Namespace", Internet Draft
<draft-ietf-dhc-option_review_and_namespace-00.txt>, June
1999.
[POLICY] Strassner, J., Elleson, E., Moore, B., "Policy Framework
LDAP Core Schema", Internet Draft
<draft-ietf-policy-core-schema-05.txt>, October 1999.
[RFC2251] Wahl, M., Howes, T., Kille, S., "Lightweight Directory
Access Protocol (v3)", RFC 2251, December 1997.
[RFC2252] Wahl, M., Coulbeck, A., Howes, T., Kille, S., "Lightweight
Directory Access Protocol (v3) Attribute Syntax Defini-
tions", RFC 2252, December 1997.
[RFC2255] Howes, T., Smith, M., "The LDAP URL Format", RFC 2255,
December 1997.
[RFC951] Croft, B., Gilmore, J., "Bootstrap Protocol (BOOTP)", RFC
951, September 1985.
[RFC2119] Bradner, S. "Key words for use in RFCs to Indicate Require-
ment Levels", RFC 2119, March 1997.
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15. Acknowledgements
This document is closely aligned with the work being done in the
Distributed Management Task Force (DMTF) Networks working group.
Design ideas included in this document are primarily based on dis-
cussions during two meetings with some members of the IETF DHC
Working Group and the DMTF Networks working group. The contribu-
tions of these individuals is gratefully acknowledged.
Special thanks to Lee Rafalow, Steve Gonczi, Steve Chirokas, Kim
Kinnear, Ellen Stokes, Tom Miller, Ye Gu, Glenn Waters, Mike Car-
ney, Ralph Droms, Greg Rabil and Steve Bazyl for their contribu-
tions.
Thanks also to Ester Burwell, Andy Sudduth, Fred Hunter, Paul Rai-
son, Josh Littlefield, Peter Heitman, Neil Russell and Linda Scobo
for their participation in these meetings.
16. Author information
Andy Bennett
Bernie Volz
Process Software Corporation
959 Concord St.
Framingham, MA 01701
Phone: (508) 879-6994
Email: bennett@process.com
Email: volz@process.com
Andrea Westerinen
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
Phone: +1 425-705-2553
Email: andreawe@microsoft.com
17. Full Copyright Statement
Copyright (C) The Internet Society (1999). 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 document itself may not be modified in any
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Internet Draft DHCP Schema for LDAP October 1999
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 lan-
guages 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 ENGI-
NEERING 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.
Bennett, et. al. Expires April 2000 [Page 30]
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