title: Destination host unreachable
body: <p>I have 3 VMs with Ubuntu 12.10: m1, m2 and m3. 
  Here are their IPs</p>
  
  <pre><code>m1 = 192.168.1.1
  m2 = 192.168.2.1
  m3 = 192.168.3.1
  </code></pre>
  
  <p>When I try to ping between them, I get a destination host unreachable. 
  If I set them to 192.168.1.X, then the ping works fine, so the VM setup is working fine. The issue is when I put them in a different 192.168.X ip. </p>
  
  <p>What's the ideal setup for all 3 machines to be able to ping each other?</p>