Once iCluster nodes are configured using a specific IP address, they will continue to use this IP address, however what if your network changes? How do you change the IP address used by iCluster? Luckily there is a TechNote on how to perform this procedure:
How do I change the IP Address of my node?
DMENDGRP—End Cluster Operations for Group
DMCHGNODE NODE(Beta) IPADDR('184.108.40.206')
Go to the other nodes in the cluster and view the node that was changed to see they reflect the new IP address before continuing.
DMENDNODE—End Cluster Operations at Node
DMSTRNODE—Start Cluster Operations at Node
DMSTRGRP—Start Cluster Operations at Group
The cluster will now use the new IP address to connect to the node. You may now go back to the node whose IP address was changed (Node Beta) and disable or remove the old IP address.
Use the steps above for any other node whose I.P. address needs to be changed.