I just picked up something strange.
When VPS1 has an IP 192.168.1.12, which is part of 192.168.1.10-192.168.1.20, then I can't assign any IP's from that range to another VPS once CloudMin reach's 192.168.1.12 itself.
For example, VPS2 has been assigned IP's 192.168.1.11 & 192.168.1.11. Since 192.168.1.12 has already been assigned to VPS1, VPS2 should now get 192.168.1.14. But it doesn't, instead I get the following error:
Failed to save network interface : SIOCGIFADDR: Cannot assign requested address SIOCSIFBROADCAST: Cannot assign requested address SIOCSIFBRDADDR: Cannot assign requested address SIOCSIFFLAGS: Cannot assign requested address