title: Acessing ARP table of Host from Docker container
body: <p>How can I access the host ARP records from within a Docker container?</p>
  
  <p>I tried to mount a volume (in a docker-compose file) <code>/proc/net/arp:/proc/net/arp</code> but  found out that I can't make any volume with <code>/proc</code>. Then I tried to mount it elsewhere like <code>/proc/net/arp:/root/arp</code>, but then if I <code>cat /root/arp</code>, from within the container, the table comes out empty.</p>
  
  <pre><code>docker run -v /proc/net/arp:/root/arp alpine cat /root/arp     &lt;-- returns empty table
  </code></pre>
  
  <p>Ideas?</p>