Microsoft KB Archive/197864

= Cannot Ping a WLBS Server from Another WLBS Server =

Article ID: 197864

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Load Balancing Service

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This article was previously published under Q197864



SYMPTOMS
When you ping a cluster host's dedicated IP address from another cluster host, you receive no response.



CAUSE
This issue is a single network interface card (NIC) limitation. If you are using a single NIC and have not selected the Windows NT Load Balancing Service (WLBS) multicast support, the cluster hosts will not be able to communicate with each other even though they can exchange network traffic with outside systems.

NOTE: On a cluster host with multiple NICs (multihomed), using the Virtual NIC to access the dedicated IP address (IP address bound to the virtual NIC but configured not to be load balanced) of another multihomed cluster host causes WLBS to consider this a single-NIC configuration



RESOLUTION
To resolve this issue, select multicast support in the WLBS Setup dialog box to eliminate this problem.

Additional query words: Convoy NLB

Keywords: kbprb KB197864

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