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We get this error on ESXi 5.0:

A duplicate IP address was detected for 192.168.x.x on the interface vmk1.
The current owner is xx:xx:xx:xx:xx:xx.

Talking to VMWare support and googling it produced nothing! Help please!


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closed as not a real question by HopelessN00b, Michael Hampton, EEAA, Tim Brigham, Chris S Aug 10 '12 at 3:53

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2 Answers 2

Well, it means that some other device (as identified by the MAC address provided) on your network has the same IP address as one of your VMKernel interfaces.

Locating the offending device will be left as an exercise for the reader.

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I'd assume you have an IP address conflict with a system on your network whose hardware address (MAC address) is xx:xx:xx:xx:xx:xx.

  • You could change the IP address of your ESXi server.
  • You could isolate the ESXi server from the rest of the network.
  • You could look for the device whose MAC address is xx:xx:xx:xx:xx:xx and change its IP or turn it off.

VMWare would not be able to help you in this instance since they don't know your environment. The error message is quite clear.

VMWare does have a knowledge base article for your specific error message.

The solution is:

Correctly set the IP address with the esxcfg-vmknic command or set it to DHCP mode.
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