def host_interface_object
      VirtualBox::Global.global.host.network_interfaces.find do |ni|
        ni.name == host_only_interface
      end
    end
def host_interface_object
      VirtualBox::Global.global.host.network_interfaces.find do |ni|
        ni.name == host_only_interface
      end
    end
Gets the host interface object associated with the class if it
 exists.