Well, even if your interfaces change, you’ll need to tell Virtualmin to update the current domains you have setup. Those IP’s are written in the Apache conf, Bind DNS, and the like.
You should be able to do most of those changes through "Addresses and Networking" -> "Change IP Address". Since your provider gave those to you already, you should be able to make those changes before your old IP goes away.
Also, you’ll want to verify the interface in System Settings -> Module Config -> Server Settings -> Network interface for virtual addresses. If it’s not set to detect automatically, just make sure it’s set to an interface that exists.
This all requires you make a lot of changes, so I’d make sure you get some good backups before moving forward
-Eric
I logged in as root and I just upgraded to the latest version of virtualmin. I still don’t see the option. The only two choices under “Addresses and Networking” are “Shared IP Addresses”
“Dynamic IP Update”