<filter name='no-arp-mac-spoofing' chain='arp-mac' priority='-520'>
  <uuid>3aaf8dbc-3601-4f8e-8940-5d2494171436</uuid>
  <rule action='return' direction='out' priority='350'>
    <arp arpsrcmacaddr='$MAC'/>
  </rule>
  <rule action='drop' direction='out' priority='1000'/>
</filter>

