This post goes over how to change IPs on an existing Microsoft Failover Cluster. It also happens to go over some Oracle Failsafe stuff.
Identify New IPs you will be using
- You will need four new IPs for the cluster
- Microsoft Cluster
- You need your new subnet mask
- You need your new Gateway IP
- You need your new DNS server IPs
- You may need two additional IPs for the Heartbeat network depending on if you are required to change those.