While the documentation make it sound like you are able to change the private IP of your droplet (see https://www.digitalocean.com/docs/networking/vpc/how-to/enable/), in reality it doesn't work. I mean the OS gets the new IP, but it cannot reach any other instances in that VPC from that point on.It would be great to have the ability to manually set the IP in a VPC.For example I am trying to put all of my DB instances under the same sub-range, so I can firewall them by range, but I cannot do that now, as I cannot set the IP, but have to live with what has been allocated.