<filter name='no-arp-mac-spoofing' chain='arp-mac' priority='-520'>
  <uuid>5dfcad54-a630-47ab-a82e-c108ad5d129c</uuid>
  <rule action='return' direction='out' priority='350'>
    <arp arpsrcmacaddr='$MAC'/>
  </rule>
  <rule action='drop' direction='out' priority='1000'/>
</filter>

