Microsoft KB Archive/219308

= Cannot Obtain Lease with DHCP Scopes Using Multicast Addresses =

Article ID: 219308

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT 4.0 Service Pack 3
 * Microsoft Windows NT 4.0 Service Pack 4

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This article was previously published under Q219308



SYMPTOMS
When you have a computer running Windows NT 4.0 Server using Dynamic Host Configuration Protocol (DHCP), computers on your network may not be able to obtain a lease.

In addition, computers configured as DHCP clients that have already obtained a lease may not function properly.



CAUSE
This behavior occurs when you create a DHCP scope using DHCP Manager, and specify a class D TCP/IP address (multicast group address). DHCP scopes cannot contain class D TCP/IP multicast addresses.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtainthe Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT 4.0 Service Pack 5.



MORE INFORMATION
In the TCP/IP address space, class D addresses are reserved for multicast groups. The address range is 224.0.0.0 to 239.255.255.255. Class D addresses are not segregated into network and host units. Some class D multicast groups are reserved.

For additional information about DHCP, scopes, and multicasting, please refer to the following Request for Comment (RFC) documents:

Dynamic RFC1541: Host Control Protocol

RFC1112: Host Extensions for IP Multicasting

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Keywords: kbhotfixserver kbqfe kbbug kbfix kbnetwork KB219308

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