title: Vagrant + Docker provider, struggling with static IP
body: <p>I'm struggling with static IP assignment for Docker provider.</p>
  
  <pre><code>config.vm.define "dockeragent" do |dockeragent|
      dockeragent.vm.provider "docker" do |d|
          d.build_dir = "../installers/docker/"
      end
      dockeragent.vm.network :private_network, ip: "172.16.1.3"
  end
  </code></pre>
  
  <p>I want my container named <code>dockeragent</code> uses <code>172.16.1.3</code> but it's using always <code>172.16.1.1</code>, my problem is that I want multiple containers, and each container must have its own IP.</p>