A “Re-IP-ing” project around the corner where you need to change IP addresses on all hosts in a subnet? Or just a cluster? When you change the IP addresses on cluster nodes, cluster resources go offline.
With the IP addresses on nodes changed (while moving to different network/subnets), when you start Cluster Admin you can’t connect to the cluster. The IP address resource in your Cluster Group still has the old IP, which means your cluster nodes and the cluster itself are on different networks!
To change the IP address on the cluster, start Cluster Administrator and connect to the node name or . (dot). Go to IP address resource | properties | Parameters and change the IP address (and subnet, if required). Make sure the correct network is selected from the Network drop-down. (In most such situations, it’ll be the Public network that’s impacted).
Now you can bring the Cluster Group online.
If you have any other resource groups (like an Exchange Virtual Server resource group for Exchange clusters), you may need to repeat the process for those groups.