    <interface type='bridge'>
      <source bridge='VM Network'/>
      <mac address='52:54:00:99:99:99'/>
    </interface>
    <interface type='network'>
      <source network='nancy'/>
      <mac address='52:54:00:01:02:03'/>
    </interface>
    <interface type='bridge'>
      <source bridge='bob'/>
      <mac address='52:54:00:01:02:04'/>
    </interface>
    <interface type='network'>
      <source network='default_network'/>
      <mac address='52:54:00:01:02:05'/>
    </interface>
    <interface type='network'>
      <source network='default_network'/>
      <mac address='52:54:00:01:02:06'/>
    </interface>
    <interface type='network'>
      <source network='default_network'/>
      <mac address='52:54:00:01:02:07'/>
    </interface>
    <interface type='bridge'>
      <source bridge='ringo'/>
      <mac address='52:54:00:01:02:08'/>
    </interface>
