Microsoft KB Archive/306049

= Enabling VLAN Support on Intel PRO/100 Network Adapter Causes Loss of Network Connectivity =

Article ID: 306049

Article Last Modified on 1/31/2007

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

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This article was previously published under Q306049



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



SYMPTOMS
When you enable Virtual Local Area Network (VLAN) support on an Intel PRO/100 Intelligent Server network adapter that is installed on a Windows 2000-based computer, network connectivity is lost. You may not be able to ping either the default gateway or the local host.



CAUSE
This behavior occurs because of a problem that Intel has found in the PRO/100 Intelligent Server network adapter. This problem prevents VLANs from working properly under Windows 2000.



WORKAROUND
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.

To resolve this behavior, update the Intel driver for the network adapter, and then add a value in the registry for each network adapter that is configured for VLANs:  Read the statement from Intel concerning this problem. You can read this statement at the following Intel Web site:

http://support.intel.com/support/network/adapter/pro100/pro100i/30599.htm

 Update the driver for the Intelligent Server network adapter by using the drivers that are contained in 100VW2K.exe. You can obtain this file at the following Intel Web site:

http://support.intel.com

The file installs both PROSet, which is an Intel utility that is used to configure the adapter, and the Ivlanw2k.sys drivers that are required to configure and use VLANs. Use the PROSet utility to configure the VLANs. After you update the driver and configure the VLANs, add a value in the registry for each network adapter that is configured for VLANs:  Start Registry Editor (Regedt32.exe). Locate and click the following key in the registry

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\iVLANProtocol\Parameters\Adapters\ 

where  is a long string of letters and numbers.

</li>  On the Edit menu, click Add Value, and then add the following registry value: <pre class="fixed_text">  Value name: DontUseMulticastAll<BR/> Data type: REG_DWORD<BR/> Radix:     Binary<BR/> Value data: 1 </li> Quit Registry Editor.</li></ol> </li> Restart the computer.</li></ol>

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MORE INFORMATION
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

For information about how to contact Intel, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

60782 Hardware and Software Third-Party Vendor Contact List, Q-Z

Additional query words: NIC

Keywords: kbnetwork kbprb kb3rdparty KB306049

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