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Q123986: DHCP Server Excludes Address Clusters Within a Valid Scope

Article: Q123986
Product(s): Microsoft Windows NT
Version(s): 3.50
Operating System(s): 
Keyword(s): 
Last Modified: 08-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Server version 3.5 
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SYMPTOMS
========

When a scope is defined so that it includes a valid set of addresses in a range,
but it excludes or reserves addresses within the last 32 specific addresses of
that scope, address clusters within the legal range of the scope may not be
available to the dynamic host configuration protocol (DHCP) server for
assignment.

For example, a scope with the following settings

  Range Start: 161.240.8.1
  Range End: 161.240.15.254
  Subnet Mask: 255.255.248.0

  Excluded Addresses:

     161.240.15.126 -- 161.240.15.150
     161.240.15.181 -- 161.240.15.184
     161.240.15.187 -- 161.240.15.254

  Reserved Addresses:

     161.240.15.185, 186

results in the following pattern of DHCP server IP address assignments:

  161.240.9.0
  161.240.9.224 -- 161.240.9.255

  161.240.10.0
  161.240.10.224 -- 161.240.10.255

  161.240.11.0
  161.240.11.224 -- 161.240.11.255

  161.240.12.0
  161.240.12.224 -- 161.240.12.255

In this example, addresses within the range of 161.240.XX.0 to 161.240.XX.224
cannot be assigned by the DHCP server even though they are valid addresses
within the defined scope.


STATUS
======

Microsoft has confirmed this to be a problem in Windows NT Server version 3.5.
This problem was corrected in Windows NT version 3.51.

Additional query words: wfw wfwg prodnt

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Keywords          :  
Technology        : kbWinNTsearch kbWinNT350search kbWinNTSsearch kbWinNTS350 kbWinNTS350search
Version           : 3.50

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