<filter name='no-mac-spoofing' chain='mac' priority='-800'>
  <uuid>5c4fa4be-4b58-4e51-ad4b-d7c1d9122ea8</uuid>
  <rule action='return' direction='out' priority='500'>
    <mac srcmacaddr='$MAC'/>
  </rule>
  <rule action='drop' direction='out' priority='500'>
    <mac/>
  </rule>
</filter>

