To configure the DNS suffix information in Windows NT before you upgrade the computer to a Windows 2000-based Active Directory domain controller:

1. Right-click Network Neighborhood, and then click Properties.

2. Click the Protocols tab, click TCP/IP Protocol, and then click Properties.

3. Click the DNS tab.

4. In the Domain box, type the complete Active Directory domain name.

5. Click Apply, and then click OK.

6. Click OK to quit the Network tool.

7. Restart the computer.

To verify the settings, open a command window, and then type ipconfig /all. The Host Name line shows the fully qualified domain name.

If you must change the DNS domain information after you install Active Directory, you must run the Dcpromo utility on the computer to remove it from the domain and make it a stand-alone server.