Changing the Locally Administered Address

When using the DLC protocol, it might be necessary to change or override the network address of the network adapter. For example, some configurations of mainframe software require that the network addresses of devices follow a set format. You can change the network address of the network adapter using the registry editor (Regedt32.exe).

The following procedure is supported for IBM Token Ring adapters. To verify that you can override the network address on a specific network adapter, consult the documentation provided with the network adapter.

Warning

Do not use a registry editor to edit the registry directly unless you have no alternative. The registry editors bypass the standard safeguards provided by administrative tools. These safeguards prevent you from entering conflicting settings or settings that are likely to degrade performance or damage your system. Editing the registry directly can have serious, unexpected consequences that can prevent the system from starting and require that you reinstall Windows 2000. To configure or customize Windows 2000, use the programs in Microsoft Management Console (MMC) or Control Panel whenever possible.

To change the address of an adapter card

1. Click Start, and then click Run.
2. Type the following:

   regedt32

3. Click OK.
4. When the registry editor starts, select the following key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ibmTOKMC01

5. In the Edit menu, click Add Value.
6. Type <network address> in the Value text box, select REG_SZ for data type, and then click OK.
7. Type the 12-digit Locally Administered Address (LAA) that you need to communicate to the mainframe.

   If you do not know this address, see your network administrator or operations group.

8. Close the registry editor and restart your computer for the modification to take effect.
9. At the command prompt, type the net config rdr command to report the active media access control (MAC) address.

   If the media access control address is the same as the LAA you typed in the registry editor, the LAA has taken effect.

For more information about the registry editors, see Windows 2000 Help.

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