passthrough-duplicate.xml

<network>
  <name>passthrough-duplicate</name>
  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a8b</uuid>
  <forward mode="passthrough">
    <interface dev="eth1"/>
    <interface dev="eth2"/>
    <interface dev="eth3"/>
    <interface dev="eth3"/>
  </forward>
</network>