Microsoft KB Archive/255923

= Clearing DDNS Per-Scope Properties =

Article ID: 255923

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server

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This article was previously published under Q255923



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SUMMARY
After you configure Dynamic DNS (DDNS) properties on a scope, it is not possible to clear the per-scope DNS properties using the Dynamic Host Configuration Protocol (DHCP) snap-in. The control of that scope’s DNS properties cannot be returned to the server level.



MORE INFORMATION
DHCP option inheritance follows a natural hierarchy:
 * 1) Default or server option
 * 2) Scope option
 * 3) Class option
 * 4) Reservation option

The option types above are listed from least specific to most specific. A more specific option always takes precedence over a less specific option. Therefore, a scope option takes precedence over a server option. Normally, you can set more specific options at each level and then remove them when necessary. When you remove a more specific option (for example, Scope Option 044 - WINS Servers), any less specific option now takes effect (for example, Server Option 044 -WINS Servers).

This is true except for the case of DDNS settings. After you configure DDNS properties on a scope, it is not possible to clear the per-scope DNS properties through the DHCP snap-in. The result is that control of that scope’s DNS properties cannot be returned to the server level.

To view the DDNS properties on a server:
 * 1) Start the DHCP snap-in.
 * 2) Right-click the server, and then click Properties.
 * 3) Click the DNS tab.

To view the DDNS properties for a scope:
 * 1) Start the DHCP snap-in.
 * 2) Click the server, and then expand the scopes beneath it.
 * 3) Right-click the appropriate scope, and then click Properties.
 * 4) Click the DNS tab.

If you want to clear the DNS properties of a scope so that the scope will again use the DHCP server’s DNS properties, use the following steps.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

 Start Registry Editor. Locate and remove the following registry key (where  is the address of the scope):

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DhcpServer\Configuration\Subnets\ \SubnetOptions\081

 Stop and restart the DHCP Server service.

