Copyright: Thursday, October 07, 1999 10:40:41


Lists the available superscopes to which you can add this scope. Click the desired superscope and then click OK.


Provides a space for you to type a new numeric value to be added to the current list. Click Add to move the value to the list.


Adds a new number value to the list of current values.


Removes a selected value from the list of current values. To select a value to remove, click it in the list.


Lists the numeric values in the currently defined array. This list is specified in order of preference. The first item in the list is the first used.


Specifies that numbers entered are interpreted as decimal values.


Specifies that numbers entered are interpreted as hexadecimal values.


Provides a space for you to type the generic name of the boot image file. The name of this file is typically based on the client hardware type.


Provides a space for you to type the full path to the boot image file. This path information is returned via Trivial File Transfer Protocol (TFTP) to the BOOTP client and is appended by the client to the value in Boot image file name when issuing a fully qualified request to the TFTP server for a bootstrap configuration.


Provides a space for you to type the name of the Trivial File Transfer Protocol (TFTP) server to be contacted and used as the source for obtaining a boot image file for use by the BOOTP client.


Lists the available computers authorized within the directory to run Windows 2000 DHCP servers.


Adds a computer to the list of authorized DHCP servers within the directory.


Removes a selected computer from the list authorized to provide DHCP service within the directory.


Refreshes the list of all computers authorized to run DHCP service within the directory.


Lists the available user-defined and vendor-defined options classes for the DHCP server.

For more information, see either Microsoft vendor classes or Microsoft predefined user classes.


Adds a new options class.


Deletes a selected options class from the list box.


Click to edit a selected options class in the list box.


Provides a space for you to type a descriptive identifying name for the new option class in the console. The name you enter is used only for display purposes when you select a class from the available list of user-defined or vendor-defined classes for DHCP service.


Provides a space for you to type a comment with additional information about this option class. This comment is used only for display purposes.


Provides a space for you to type the class identifying data to be used by the DHCP Server service to match to the Class ID provided by DHCP clients. Data can be entered as octet (eight bit) values using either of the following methods for entry:

•	To enter data as ASCII text character values, click the right side of the edit box.

•	To enter data as hexadecimal byte numeric values, click the left side of the edit box.

Click OK when you have finished entering the string of character data to be used as a matching identifier string for this option class.

Windows 2000 DHCP clients can be configured through the use of the ipconfig command to use a custom identifier string that matches the value you specify here during the DHCP address lease process. Most legacy and other DHCP clients do not support user-class or vendor-class identification. For more information on configuring  Windows 2000 DHCP clients with this value, at the command prompt, type ipconfig /? for command-line help.


Provides a space for you to type any data to be provided as part of this option class. Data is entered as octet (eight bit) values using either of the following methods for entry:

•	To enter data as hexadecimal byte numeric values, click the left side of the edit box under Binary.

•	To enter data as ASCII text character values, click the right side of the edit box under ASCII.

Optionally, you can also use CTRL + left or right arrow keys to switch between Binary and ASCII edit mode.


Provides a space for you to type a value, based on the data type for this option:

•	For an IP address, type in four numbers that are separated by periods. Acceptable values for each of the four numbers range between 1 and 254.

•	For a number, type an appropriate decimal or hexadecimal value for this option.

•	For a string, type an appropriate ASCII string containing letters and numbers for this option.


Provides a space for you to type an IP address consisting of four period-separated numbers. Acceptable values for each of the four numbers range between 1 and 254.


Provides a space for you to type the name or IP address of the DHCP server where IP addresses are defined.


Adds a new IP address entry to the list.


Removes a selected IP address entry from the list.


Lists the available IP addresses that make up the current DHCP option value.

For most IP address values, the list is specified in order of preference. The first in the list is the first to be used. To change the order of an address in the list, click to select it, and then click Up or Down to move it to a new position.


Provides a space for you to type the name of a server to resolve to an IP address before adding it to the list.


Resolves a server name entered in Server name to an IP address.


Provides a space for you to type an ASCII string, using letters and numbers.


Select the applicable option class for the option type that you want to view or change.


Select the option type you want to view or change.


Adds a new custom option type in Option name.


Deletes the selected option type in Option name.


Changes the name or the comment for the selected option type in Option name.


Provides a space for you to type additional information describing the default values of the DHCP option.


Lists the available optional data currently associated with the option type.


Displays IP Address Array Editor or Numeric Value Array Editor, depending on the data type (either an IP address or binary value) of the selected option.


Provides a space for you to type a name for a new DHCP option type.


Provides a space for you to type or select a data type for this DHCP option, as described in the following list:

•	Byte.  An 8-bit, unsigned integer.

•	Word.  A 16-bit, unsigned integer.

•	Long.  A 32-bit, signed integer.

•	Long integer.  A 32-bit, unsigned integer.

•	IP address.  An IP address of the form w.x.y.z.

•	String.  An ASCII text string.

•	Binary.  Value expressed as a binary array.

•	Encapsulated.  An array of unsigned bytes.


Specifies whether the data type represents an array, such as Binary or Encapsulated.


Provides a space for you to type a unique numeric code associated with this DHCP option type.


Provides an optional space for you to type text that further describes the DHCP option type.


Provides a space for you to type a starting IP address to be excluded from scope lease offerings. This IP address must be included within the starting and ending IP addresses for the scope address pool. When entering an IP address here, it is important that the address you specify not already be in use by a DHCP client. For more information, see Configuring scopes.

Exclusions are used to exclude scope IP addresses used by non-DHCP hosts, such as routers or gateways. For DHCP-enabled clients that require a fixed or permanent IP address assignment, reservations can be used instead. For more information, see Using client reservations.


Provides a space for you to type the last IP address in the range of addresses the DHCP server should exclude from distribution in client lease offerings. When entering an IP address here its important that the entire address range (addresses between the starting IP address and this address) not contain any IP addresses that are already in use. For more information, see Configuring scopes.


Provides a space for you to type the name or IP address of the DHCP server you want to authorize for use with Active Directory.


Provides a space for you to type the IP address you want to add to the list of IP addresses.


Removes a selected client IP address from the list of IP addresses.


Resolves the server you have specified to its IP address, after which it appears in the IP address edit box.


Lists the IP addresses that are leased according to the Windows 2000 registry but are not listed in the DHCP server database. For more information, see Reconciling scopes.


Provides a space for you to type an IP address from the scope address pool that is not currently in active use. You can use any available valid scope IP address that is not already a part of an exclusion range for the scope.


Provides a space for you to type the media access control (MAC) address that is assigned to the client's network adapter. You can view this address in either of the following ways at a DHCP client computer running Windows 2000:

•	At the command prompt, type ipconfig /all and view the Physical Address for the applicable network connection.

•	In the Network and Dial-up Connections folder, click the applicable network connection. Right-click and select Properties, and then view the displayed MAC address.

For more information, see Using client reservations.


Provides a space for you to type the computer name of the reserved client. This name is only used for identification purposes and does not affect the actual computer name configured for the client.


Provides an optional space for you to type a comment to describe the reserved client. This comment is used in the console details pane for display purposes only.


Specifies that only a DHCP-type client is allowed for this client reservation.


Specifies that only a BOOTP-type client is allowed for this client reservation. For more information, see Supporting BOOTP clients.


Specifies that either DHCP or BOOTP clients are allowed for this client reservation. For more information, see BOOTP and DHCP.


Provides a space for you to type the IP address of the DHCP client.


Provides a space for you to type the subnet mask of the DHCP client.


Displays the computer name of the DHCP client.


Displays additional comment information about the DHCP client.


Displays the date and time when the DHCP client's lease will expire if it is not renewed.


Displays the type of DHCP client.


Specifies whether the DHCP server sends DNS dynamic record updates to the DNS server. Updates are sent to DNS servers configured in TCP/IP client properties for any active network connections at the DHCP server. For more information, see Using DNS servers with DHCP.


Specifies that the DHCP server update forward and reverse lookups are based upon the type of request made by the client during the lease process.


Specifies that the DHCP server update forward and reverse DNS lookups when a client acquires a lease, regardless of the type of request used to acquire the lease.


Specifies whether the DHCP server discards forward DNS lookups for clients when a lease expires.


Specifies whether the DHCP server sends dynamic updates to the DNS server for any DHCP clients that do not directly support performing these updates. If selected, clients running under earlier versions of Windows are updated by the DHCP server for both their host (A) and pointer (PTR) resource records.

By default, Windows 2000 DHCP clients are enabled to send dynamic updates to their configured DNS servers for their host (A) resource records, but typically do not update pointer (PTR) resource records unless configured to do so.


Provides a space for you to type the name used by the DHCP console to describe this multicast scope. This name is used for identification purposes only.


Provides a space for you to type the first IP address in the range of addresses used to define this multicast scope.


Provides a space for you to type the last IP address in the range of addresses used to define this multicast scope.


Displays the unique identifier that DHCP clients can use to identify this multicast scope when requesting a multicast lease from a DHCP server. This value is overwritten by the DHCP Server service with the starting IP address in the multicast scope when the multicast scope range is configured.


Provides a space for you to type a new Time-To-Live value in seconds for IP datagrams sent to multicast addresses within this scope. The Time-To-Live value is used to determine the lifetime of each multicasted datagram. You can also click the scroll arrows to select a new setting.


Specifies whether this multicast scope is the default scope used to supply multicast addresses to DHCP clients.

The default scope is used when a DHCP client does not specify an IP address when requesting a multicast lease from the DHCP server.


Specifies that IP address leases do not expire. Unlimited leases should be used with caution.


Specifies that the lease duration for IP addresses used in the scope is limited. This selection requires that you set a length of days, hours, and minutes for which addresses are leased.


Provides a space for you to type the number of days before a client lease expires. You can also click the scroll arrows to select a new setting.


Provides a space for you to type the number of hours before a client lease expires. You can also click the scroll arrows to select a new setting.


Provides a space for you to type the number of minutes before a client lease expires. You can also click the scroll arrows to select a new setting.


Provides a space for you to type an optional comment describing the scope.


Select a vendor class from the list of defined classes before assigning and configuring DHCP client options that apply only to clients that are identified as members of this class. If the class list is empty or the class you want to select is not on the list, create the new option class before assigning options here. For more information, see Using option classes.


Select a user class from the list of defined classes before assigning and configuring DHCP client options that apply only to clients that are identified as members of this class. If the class list is empty or the class you want to select is not on the list, create the new option class before assigning options here. For more information, see Using option classes.


Lists the available DHCP options that can be assigned to clients of the selected option classes. Option types here can be grouped into one of these categories:

•	Available options. These are currently defined for this DHCP server. Most of these options function as described in RFC 2132. By default, most Microsoft DHCP clients only support a small number of these, unless updated by other applications. For more information, see either DHCP RFCs or DHCP options reference.

•	Custom options. These are additional options you can create for this DHCP server. You can add and remove option types as necessary. When you do, this list is updated. For more information, see To create a new default option type.

•	Microsoft options. These options are predefined for use in Windows 2000. These options only appear if you have selected one of the applicable Microsoft vendor classes.

Option values assigned at this level can override other assigned values set at this server for the same option. For more information, see Assigning options.


Lists the available DHCP options that can be assigned to clients of this scope or server. Option types here can be grouped into one of these categories:

•	Available options. These are currently defined for this DHCP server. Most of these options function as described in RFC 2132. By default, most Microsoft DHCP clients only support a small number of these, unless updated by other applications. For more information, see DHCP RFCs, DHCP options reference or Microsoft DHCP clients.

•	Custom options. These are additional options you can create for this DHCP server. You can add and remove option types as necessary. When you do, this list is updated. For more information, see

•	To create a new default option type.

Option values assigned at this level can override other assigned values set at this server for the same option. For more information, see Assigning options.


Provides a space for you to type a name for this DHCP option.


Provides a space for you to type a class for this DHCP option.


Provides a space for you to type a type for this DHCP option.


Provides a space for you to type a comment for this DHCP option.


Provides a space for you to type an IP address to be included with this option. Click Add to move the value to the IP addresses list.


Adds a new IP address entry to the list of addresses.


Removes a selected IP address from the list of addresses. To select an address to remove, click it in the list.


Lists the server IP addresses that are assigned with this option, such as DNS or WINS servers. Sort the list in order of preference, so that the first server on the list is the first contacted.


Displays the reserved IP address from the scope address pool. You can specify any unused IP address in the scope.


Provides a space for you to type the media access control (MAC) address that is assigned to the client's network adapter. You can view this address in either of the following ways at a DHCP client computer running Windows 2000:

•	At a command prompt, type ipconfig /all and view the Physical Address for the applicable network connection.

•	In the Network and Dial-up Connections folder, click the applicable network connection. Right-click and select Properties, and then view the displayed MAC address.

For more information, see Using client reservations.


Provides a space for you to type a new name to identify the client.

This name is used for display purposes only and does not affect the actual computer name configured for the client.


Provides an optional space for you to type additional information about this client.


Specifies that DHCP clients in this scope are dynamically assigned IP addresses. This setting is recommended if the scope consists of only DHCP clients.


Specifies that IP addresses are automatically assigned to DHCP and BOOTP clients by the DHCP server. For more information, see BOOTP and DHCP.


Specifies that BOOTP clients in this scope are dynamically assigned IP addresses. This setting is recommended if the scope consists of only BOOTP clients. For more information, see Supporting BOOTP clients.


Provides a space for you to type the name used to describe the scope. This name is used for identification purposes only.


Provides a space for you to type the first IP address in the range of addresses used to define the DHCP scope.


Provides a space for you to type the last IP address in the range of addresses used to define the DHCP scope.


Displays the subnet mask used by this scope.


Displays the length in number of bits of the subnet mask.


Provides a space for you to type an optional comment describing the scope.


Provides a space for you to type a new number of conflict detection attempts you want the DHCP server to make before it leases an address to a client. You can also click the scroll arrows to select a new setting.


Provides a space for you to type the location of DHCP server audit log files. If you are unsure of the location of these files, click Browse. For more information, see Audit logging.


Provides a space for you to type the location of the database. If you are unsure of the location, click Browse to locate the database.


Click to browse folders and locate the log file.


Click to browse folders and find the database file.


Changes DHCP server bindings that determine which network connections are used to service clients.


Changes DHCP server bindings that determine which network connections are used to service clients.


Automatically refreshes DHCP server statistics at the time interval set below.


Provides a space for you to type a new number of hours between refreshing of DHCP server statistics. You can also click the scroll arrows to select a new setting.


Provides a space for you to type a new number of minutes between refreshing of DHCP server statistics. You can also click the scroll arrows to select a new setting.


Specifies whether to log DHCP server activity. Select this check box to begin logging DHCP server activity to a text file used for audit logging. You can use this file to troubleshoot DHCP problems. For more information, see Audit logging.


Specifies whether to display the BOOTP Table folder for this server. Click this option if you want to enable and configure DHCP server support for BOOTP clients on your network. For more information, see either BOOTP and DHCP or Supporting BOOTP clients.


Specifies whether to enable or disable Active Directory authorization popup warnings.


Provides a space for you to type a name for this group of DHCP servers. This name is used for identification purposes only.


Provides a space for you to type a name for this superscope. This name is used for display purposes only.


Moves a selected value down the list.


Moves a selected value up the list.


Displays the list of statically configured TCP/IP-based network connections for this DHCP server. You can select which of these connections the DHCP Server service binds to and uses when servicing clients. When a check box is selected, the connection is used to service DHCP clients. When the check box is cleared, the connection is not used to service DHCP clients. For more information, see Multihomed DHCP servers.


Provides a space for you to type a numeric value.


Displays the list of DHCP servers that have been previously authorized in Active Directory. For more information, see Authorizing DHCP servers.


Provides a space for you to type an IP address consisting of four period-separated numbers. Acceptable values for each of the four numbers range from 1 to 254.


Browses for a DHCP server to add to the console.


Specifies that this multicast scope be retired at a defined date and time.


Provides a space for you to type a text string value.


Specifies that a DHCP server you have either typed information for below or selected by clicking Browse be added to the DHCP console.


Permits this multicast scope to have an indefinite lifetime.


Provides a space for you to type a scope expiration date in mm/dd/yy format. Optionally, you can click the down arrow and select a date by using the drop-down calendar.


Provides a space for you to type a time, either AM or PM, in hh/mm/ss format. Optionally, you can click the spin controls up or down to modify the time.


Provides a space for you to type the name or IP address of the DHCP server.


Specifies that you want to select a server from the list below to add to the console. This list contains only Windows 2000 DHCP servers that have been previously authorized in Active Directory. For more information, see To authorize a DHCP server in Active Directory.