<filter name='clean-traffic-gateway'> <!-- 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 --> <filterref filter='no-ip-spoofing'/> <!-- preventing ARP spoofing/poisoning --> <filterref filter='no-arp-spoofing'/> <!-- accept all other incoming and outgoing ARP traffic --> <rule action='accept' direction='inout' priority='-500'> <mac protocolid='arp'/> </rule> <!-- accept traffic only from specified MAC address --> <rule action='accept' direction='in'> <mac match='yes' srcmacaddr='$GATEWAY_MAC'/> </rule> <!-- allow traffic only to specified MAC address --> <rule action='accept' direction='out'> <mac match='yes' dstmacaddr='$GATEWAY_MAC'/> </rule> <!-- preventing any other traffic than between specified MACs and ARP --> <filterref filter='no-other-l2-traffic'/> <!-- allow qemu to send a self-announce upon migration end --> <filterref filter='qemu-announce-self'/> </filter>