<filter name='clean-traffic'>
   <!-- An example of a traffic filter enforcing clean traffic
        from a VM by
      - preventing MAC spoofing -->
   <filterref filter='no-mac-spoofing'/>

   <!-- preventing IP spoofing on outgoing, allow all IPv4 in incoming -->
   <filterref filter='no-ip-spoofing'/>
   <filterref filter='allow-incoming-ipv4'/>

   <!-- preventing ARP spoofing/poisoning -->
   <filterref filter='no-arp-spoofing'/>

   <!-- preventing any other traffic than IPv4 and ARP -->
   <filterref filter='no-other-l2-traffic'/>

</filter>