<filter name='testcase'> <uuid>d6b1a2af-def6-2898-9f8d-4a74e3c39558</uuid> <!-- allow incoming ICMP Echo Request --> <rule action='accept' direction='in' priority='500'> <icmp type='8'/> </rule> <!-- allow outgoing ICMP Echo Reply --> <rule action='accept' direction='out' priority='500'> <icmp type='0'/> </rule> <!-- drop all other ICMP traffic --> <rule action='drop' direction='inout' priority='600'> <icmp/> </rule> </filter>