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

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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.

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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.

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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: http://technet.microsoft.com/en-us/windowsserver/bb693323.aspx (http://technet.microsoft.com/en-us/windowsserver/bb693323.aspx) Chknic.exe is included in the Microsoft Windows Server 2003 Resource Kit.

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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

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