title: Pass --net=host to docker build
body: <p>To pass other options to <code>docker build</code>, you can speciy <code>DOCKER_OPTS</code> in <code>/etc/default/docker</code>, however --net is not available. Is it possible to use the host's networking stack when building a container?</p>
  
  <p>I'm running Docker version 1.3.2, build 39fa2fa.</p>
  
  <p>Thanks!</p>