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Setting Exclusion Ranges

Updated: March 28, 2003

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

To prevent address conflicts, the scopes that you define must exclude the IP addresses of devices that you statically configure, such as DHCP servers. By setting exclusion ranges, an administrator can exclude IP address ranges within a scope so that those addresses are not offered to DHCP clients. When you create a new scope, immediately exclude addresses of the existing statically configured computers. Excluded IP addresses can be active on your network, but only when these addresses are manually configured or distributed as reserved IP addresses. For more information about reservations, see "Creating Reservations" later in this chapter.

You can set exclusion ranges in the Add Exclusions page of the New Scope Wizard. For more information about using the New Scope Wizard, see "Creating Scopes" earlier in this chapter.

To set an exclusion range after a scope is created

  1. In the DHCP snap-in, expand the scope you want to configure.

  2. Select and right-click Address Pool under the appropriate scope.

  3. Select New Exclusion Range.

  4. In the Add Exclusion dialog box, type the starting and ending IP addresses of the exclusion range, and then click Add.

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