Microsoft KB Archive/123986

= DHCP Server Excludes Address Clusters Within a Valid Scope =

Article ID: 123986

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 3.5

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This article was previously published under Q123986



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

Keywords: KB123986

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