Cluster Node IP address duplicate

Chadi Naghi 21 Reputation points


I came across a strange behavior when testing a Failover Cluster on WS2016 Std:

As I unplug the network cable from one Node (to simulate network failure), the cluster is not moving to the other Node. However, it successfully does if instead of removing the cable I disable the NIC interface.

When Network Cable is plugged back to that Node, the network remain unidentified (instead of domain.local) and ipconfig /all shows the IP address with a comment (Duplicate) instead of (Preferred) and the machine is not pingable from another host and the Cluster fails.

By disabling the NIC and enabling it, the IP address is no longer Duplicate, the machine is pingable and the Cluster can refresh (however showing all roles offline)

AD DC running DNS, no DHCP. All addresses are Static.

Any thoughts?

Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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Accepted answer
  1. Mico Mi 1,921 Reputation points

    Please ensure your servers are fully patched and the NIC drivers are updated to the latest.
    Did you select Protected Network in VM Setting? Expend Network adapter then select Advance feature, here we will see Protected Network option. It is used to monitor the network connection in this adapter, if this virtual network adapter lose network connection, then, the VM belongs to cluster will failover to other node in the cluster.
    Do you mean this issue happens after you disabled the NIC interface?
    Please check if there is any related error ID in event viewer.
    If you try to disable or unplug again, will the same issue happen?
    If you want to simulate network failure, you can check the following thread for further information:
    Windows 2012 R2 Cluster - network adapter failure

    Thanks for your time!
    Best Regards,
    Mico Mi


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  1. upender tiwari 1 Reputation point

    Hi ,

    Try to issue command ipconfig /release and then issue ipconfig / renew

    by doing this you will be releasing the IP address and then getting a new IP address.

    hope this answer helps,