Vagrant ssh and private network broken

Question

Server is a fresh centos72 install, with pretty much dead in the water vagrant/vbox provider installed.

I have vagrant 1.8.6 rpm installed on a server with vbox 5.1.8r111374 , the box boxcutter/centos72 comes up, with error:

SSH auth method: private key
    gocd: Warning: Remote connection disconnect. Retrying...

And yet... vagrant ssh works. The config file is basic af.

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
 config.vm.define "boxname" do |boxname|
     boxname.vm.box = "boxcutter/centos72"
     boxname.vm.hostname = "test"
     boxname.vm.network "private_network", ip: "192.168.111.10"
     boxname.vm.provision :shell,
         path: "prov.sh"
 end
end

This can't run the prov script as it never gets past ssh set up. And vagrant provision won't work either because of the error above. I've obviously specified a private network, however once on the box the ifcfg-enp file looks like this:

TYPE=Ethernet
BOOTPROTO=dhcp

And the IP is a 10 address.

Answer 1

VirtualBox 5.1.x seems to be having major issues. Revert to 5.0.26 (5.0.28 seems to have major networking issues, too).