Change 2012 Hyper-V cluster IP range

[BJG]

I'm currently trying to change a 2012 Hyper-V failover cluster with three nodes to a different address range. (Yeah, I know I shouldn't be on 2012, I told them that.)

 

I can change the IP range of the hosts and their solitary virtualised DC OK (from 192.168.1.x to 192.168.21.x), but after doing that I can't connect to the Failover Cluster, the IP of which is still on the old range. I've Googled changing the IP address of the cluster and I can't see how to change it without connecting to it first.

 

What's the route out of this...? Should I change everything back to how it was, then presumably I'll be able to connect to the cluster again, and start by changing the IP range for that?

 

(The system is currently an offline/isolated backup with no other VMs running apart from the DC.)

Edited January 10, 2023 by BJG