Hello everyone, I've got several ISPConfig installations (versions 3.0.x) on Debian 8. These I want to update to Debian 9 and ISPConfig 3.1.x. All these instances are virtual machines on one host. Because I have to migrate them to another host I have to change the IP-addresses and hostnames of the virtual machines, too. What is the proposed procedure to accomplish this? In which order should I do the updates and in which places do I have to update the IP and hostname? Thanks for your support!