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Article ID: 837206 - Last Review: January 12, 2015 - Revision: 4.0

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When you set the ClassID value for a DHCP-enabled network adapter on a Microsoft Windows XP-based computer, the ClassID value may be lost or overwritten and the network adapter may not receive the correct DHCP options.


Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389  ( ) How to obtain the latest Windows XP service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: (
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

   Date         Time   Version            Size    File name
   02-Apr-2004  16:40  5.1.2600.1351     103,936  Dhcpcsvc.dll     


   Date         Time   Version            Size    File name
   02-Apr-2004  16:35  5.1.2600.1351     322,048  Dhcpcsvc.dll     IA-64
   02-Apr-2004  16:40  5.1.2600.1351     103,936  Wdhcpcsvc.dll    x86


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

More information

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684  ( ) Description of the standard terminology that is used to describe Microsoft software updates

DHCP ClassID values are an optional mechanism in DHCP. The ClassID value permits you to configure options for groups (or "classes") of clients. If user classes are configured, clients can receive DHCP options depending on the user class that they belong to.


For additional information about using wildcard characters to set the ClassID on multiple network adapters, click the following article number to view the article in the Microsoft Knowledge Base:
830358  ( ) You cannot use IPCONFIG with a wildcard character to set the ClassIDs of multiple network adapters

Applies to
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB837206
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