KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q150544: DHCP Manager Scope Properties

Article: Q150544
Product(s): Microsoft Windows NT
Version(s): 3.50 3.51
Operating System(s): 
Keyword(s): 
Last Modified: 09-AUG-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows NT Workstation versions 3.5, 3.51 
- Microsoft Windows NT Server versions 3.5, 3.51 
-------------------------------------------------------------------------------

The following information describes the general properties and maintenance
activities performed on Microsoft DHCP scopes.

MORE INFORMATION
================

The subnet identifiers and address pool make up the properties of scopes. You
can change the properties of an existing scope by selecting the scope for which
you want to change properties and then clicking Properties on the Scope menu.
You can also double-click the scope to access its properties.

Modifying a Scope
-----------------

After a scope has been created, you can extend the address range of the scope,
but you cannot reduce it.

Removing a Scope
----------------

No leases can be active when a user wants to remove a scope. This task can be
accomplished by deactivating the scope until all client leases expire or all
client lease extension requests are denied. Once there are no more active leases
contained in the scope, you can remove the scope by selecting the scope under
DHCP Servers and choosing Delete on the Scope menu.

Add Reservations
----------------

You can configure DHCP so that a DHCP server always assigns the same IP address
to a client. This is called a client reservation. This may be necessary because
you may need to assign a DHCP client the same IP address every time it makes a
request.

To configure a reservation, select the Scope under DHCP Servers and choose Add
Reservations on the Scope menu. Type the appropriate IP address and the Unique
Identifier/MAC address of the client. The unique identifier can be displayed by
typing NET CONFIG RDR or IPCONFIG /ALL (WINIPCFG on Windows 95) from a command
prompt.

One advantage of a reservation over an exclusion is that with a reservation, the
clients can still be administered using the Active Leases option on the Scope
menu. If you statically assign an address and exclude it from the scope, the
client will not show up in the Active Leases list.

In addition, a reservation still requires that the client register with the DHCP
server. This forces the client to accept the DHCP options that may be configured
for the subnet. An exclusion will NOT receive DHCP options for that scope
dynamically; they must be hardcoded on the client.

Active Leases
-------------

The Active Leases option allows a graphical display of current leased IPs as well
as client reservation. If the computer symbol includes a phone, it is a lease
owned by the RAS service (NDISWANx wrapper).

Although a client lease can be deleted from within this graphical display, the
client may still receive the same address following an IPCONFIG /RENEW command
because the client also has a copy of its address information locally. Until a
client receives a different address or a negative acknowledgment (NACK) for a
request to have the same address, it will ask for the same IP.

Additional query words: prodnt
======================================================================
Keywords          :  
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : 3.50 3.51

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.