You will not have a problem with the new server because when you install the Splunk software you will configure it with the correct IP information.
If you have forwarders, then you need to verify that the forwarders are updated to send data to the new IP by changing the IP address in splunk//etc//system//local//outputs.conf.
If you use a deployment server, then you need to verify that the forwarders are updated by changing the IP address in the splunk//etc//system//local//deploymentclient.conf file.
