Microsoft KB Archive/296593

= &quot;Option 81&quot; Error Message When You Import Scopes By Using Dhcpexim.exe =

Article ID: 296593

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server

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This article was previously published under Q296593



SYMPTOMS
When you import a configuration file that you created on another Windows 2000 DHCP server, the import does not succeed and you receive the following error message:

Option 81 conflicts with an existing option



CAUSE
This problem occurs if you create the server export file on a Windows 2000 DHCP server that you configured to perform dynamic Domain Name System (DNS) updates on behalf of DHCP clients.



RESOLUTION
To work around this problem, configure the import DHCP server to have the same dynamic DNS settings as the server on which you created the export file. To verify that the configurations are the same on the DHCP server that you are using to export the scopes and the server that is importing the scopes:
 * 1) In Microsoft Management Console (MMC), open DHCP Server.
 * 2) Right-click the server, and then click Properties.
 * 3) Click the DNS tab to view the configuration. Each setting must be the same on both DHCP servers.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbprb kbdhcp KB296593

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