We can do exactly the same for detecting a duplicate IP Address for an ESXi host. I have shown an example of this before in my Detecting ESXi Remote Syslog Connection Error Using a vCenter Alarm article. The really neat thing about these VOBs is that you can create vCenter Alarms when a specific VOB has been detected.
In our case, we are seeing an intermittent network connectivity to our ESXi host which is in result of a duplicate IP Address. These "observations" can provide critical identifying information in case of an error and is usually used during troubleshooting.
In addition to logging to the VMkernel logs, ESXi also logs this "observation" in /var/log/vobd.log which stands for the VMkernel Observation. Wouldn't it be great if we had an alarm to automatically notify us when a duplicate IP Address is detected? Well I am glad you asked and the answer is YES! 🙂 The biggest challenge of course is to identify which ESXi host actually has a conflict and then taking a look at the logs to find the offending MAC Address and shutting them down yourself or with the help of a Network Administrator.
Vmware mac address conflict alarm windows#
Similar to a Windows OS, ESXi can also detect a duplicate IP Addresses but instead of a notification window, it is just logged in the VMkernel logs which looks like the following: We probably have all experienced this once in our lives and it can be quite difficult and frustrating to troubleshoot. Per Duncan's tweet, it looks like he may have accidentally assigned an IP Address to one of his virtual machines which was already being used by an existing ESXi host causing a duplicate IP Address error. The motivation for this article was a tweet I noticed from Duncan Epping this morning.
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