Converting shared IPs into private/dedicated ones


I probably should provide a little background info about my setup and what I’m ultimately trying to achieve.
I have a Debian 8 VPS with 2 static IP addresses on a same NIC:

root@VM-4720-21616-01:~# ip a show eth0 2: eth0: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:15:5d:bb:ab:ee brd ff:ff:ff:ff:ff:ff inet brd scope global eth0 valid_lft forever preferred_lft forever inet brd scope global secondary eth0:0 valid_lft forever preferred_lft forever inet6 fe80::215:5dff:febb:abee/64 scope link valid_lft forever preferred_lft forever

This VPS is supposed to host only 2 websites. Both should have their own IPs in case I might consider installing SSL certs on them at some point.

After installing Virtualmin via the script this is how it detected my network config:

The default NIC for virtual addresses is eth0. For some reason eth0:0 could not be selected for vhosts until it was explicitly added via this command:

root@VM:~# virtualmin create-shared-address --ip
Created shared IP address

root@VM-4720-21616-01:~# virtualmin list-shared-addresses
Address Type Reseller name System default Shared address

Now I can choose between the two addresses when I want to create another vhost:

However, even when there were no vhosts created, I could not assign a virtual server to “Virtual with IP” option as it would give me an error: Failed to change IP address : The virtual interface IP address is already in use

If I go to Server configuration --> Change IP address for a particular domain in the Use dedicated address there’ll be no drop-down to select an address:
And if type the IP that the site currently is on manually, it’ll throw: Failed to change IP address : The virtual interface IP address is already in use

So my main question is how can I convert my shared IPs into dedicated ones? I didn’t find any CLI methods that could perform this operation:

root@VM:~# virtualmin --help | grep -i address
create-shared-address Adds an IP address for use by multiple virtual servers
delete-shared-address Removes an IP address that can be used by virtual
list-shared-addresses Lists shared IP addresses for virtual servers

Coming from Plesk I remember that it had an option to explicitly set your IPs either as as “exclusive” or “shared” ones. How can this be done in Virtualmin?
Is there something I miss?

Thanks in advance!