Microsoft KB Archive/816910

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

Article ID: 816910

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 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

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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.



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: http://technet.microsoft.com/en-us/windowsserver/bb693323.aspx 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

Keywords: kbprb KB816910

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