Cannot ping IP addresses after you enable Network Load Balancing on network adapter (816910)

The information in this article applies to:

Microsoft Windows Server 2003, Web Edition
Microsoft Windows Server 2003, Standard Edition
Microsoft Windows Server 2003, Enterprise Edition
Microsoft Windows Server 2003, Datacenter Edition
Microsoft Windows Server 2003, 64-Bit Enterprise Edition
Microsoft Windows Server 2003, 64-Bit Datacenter Edition
Microsoft Windows Small Business Server 2003, Standard Edition
Microsoft Windows Small Business Server 2003, Premium Edition

SYMPTOMS

When you enable Network Load Balancing on the network adapter, you can no longer ping any of the IP addresses bound to that network adapter from another system.

CAUSE

Network Load Balancing in Windows 2003 requires the following support in network cards: the network adapter must support multi-packet receive indications. There is a limited number of server-class network adapters that fall in this category.

RESOLUTION

Use a server-class network adapter that supports multi-packet receive indications. To determine whether your network adapter supports multi-packet receive indications, download and run the Chknic.exe tool. To do this, visit the following Microsoft Web site: www.microsoft.com/windowsserver2003/techinfo/reskit/resourcekit.mspx Chknic.exe is included in the Microsoft Windows Server 2003 Resource Kit.

MORE INFORMATION

The following is an example of the output from the Chknic tool:

Device : Intel(R) PRO/100+ MiniPCI
Physical address : 00-D0-59-10-EC-C6
Device is supported by NLB

Device : Xircom Ethernet Adapter 10/100
Physical address : 00-80-C7-E4-B5-E4
Device is not supported by NLB

Modification Type:	Minor	Last Reviewed:	12/20/2004
Keywords:	kbprb KB816910