<filter name='no-arp-mac-spoofing' chain='arp-mac' priority='-520'>
  <uuid>8dfee3ac-ed49-49c0-920c-e69ed726d996</uuid>
  <rule action='return' direction='out' priority='350'>
    <arp arpsrcmacaddr='$MAC'/>
  </rule>
  <rule action='drop' direction='out' priority='1000'/>
</filter>

