title: Vagrant::Errors::NetworkCollision: The specified host network collides with a non-hostonly network
body: <p>I'm using vagrant with multiple machine, it's ever worked normally, but then it just doesn't work again.</p>
  
  <p>My part of Vagrantfile that defining the network:</p>
  
  <pre><code>config.vm.define "app" do |layer| 
      layer.vm.provision "chef_solo", id:"chef" do |chef|
           .....
      end
  
      # Forward port 80 so we can see our work
      layer.vm.network "forwarded_port", guest: 80, host: 9999
      layer.vm.network "private_network", ip: "10.10.10.10"
    end
  </code></pre>
  
  <p>It's a standar configuration and I only have that vm. But when I tried to <code>vagrant up</code>, it shows error:</p>
  
  <pre><code>Vagrant::Errors::NetworkCollision: The specified host network collides with a non-hostonly network!
  This will cause your specified IP to be inaccessible. Please change
  the IP or name of your host only network so that it no longer matches that of
  a bridged or non-hostonly network
  </code></pre>
  
  <p>How to fix it?</p>