Microsoft KB Archive/193598

= IP Conflict After Installing Windows NT Load Balancing Service =

Article ID: 193598

Article Last Modified on 10/31/2006

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APPLIES TO


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

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This article was previously published under Q193598



SYMPTOMS
After installing Windows NT Load Balancing Service (WLBS) and restarting a cluster host, the following Windows NT system error is received:

The system has detected an IP address conflict with another system on the network.



CAUSE
Probable causes are as follows:


 * 1) Two different cluster primary IP addresses were entered in the TCP/IP configuration in the Windows NT Network dialog box on different hosts.
 * 2) Two different cluster network addresses were entered in the WLBS Setup dialog box on different hosts.
 * 3) One or more of the cluster network interface cards (NICs) could not change its network address. This problem only occurs when using a unicast network address (instead of a multicast address).



RESOLUTION
To resolve these issues, use the corresponding resolutions below:


 * 1) Be sure to use one primary cluster IP address for all cluster hosts.
 * 2) Be sure to use one cluster network address for all cluster hosts.
 * 3) You should either switch to a different type of NIC or use WLBS's multicast support.

Additional query words: Convoy WLBS

Keywords: kbnetwork kbprb KB193598

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