Change the IP Addresss of Servers that are members of a Windows Failover Cluster and SQL cluster

Hi all,
I have 3-nodes Windows Server 2012 R2 Cluster, on top of it I have two clustered named SQL 2012 instances installed. We need to change the IPs and subnet for the three physical servers incorporated in the Windows cluster. What will be the impact on
the Windows and SQL clusters? What extra configuration is needed in both Windows and SQL clusters to make sure the service will not fail after changing the IPs?

A similar question was answered
here.
The impact is that your Windows and SQL Server failover clustered instances will be offline during configuration so you need to schedule downtime. Plus, your client applications will not be able to find the new IP addresses immediately, depending on your
DNS TTL value. Work with your network/systems engineers to find out what this value is or validate the existing TTL values on your clustered resources by checking the HostRecordTTL property value. A workaround here is to set the HostRecordTTL property values
of your SQL Server network name to a very low value, say 1 minute, and then change it back to the current one once all of the applications can connect back to them.
Edwin Sarmiento SQL Server MVP | Microsoft Certified Master
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Change the IP Addresss of Servers that are members of a Windows Failover Cluster and SQL cluster

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