@0 pass inet from 224.4.0.0/16 to any flags S/SA keep state
  [ Skip steps: i=end d=end f=end p=end sa=end sp=end da=end dp=end ]
  [ queue: qname= qid=0 pqname= pqid=0 ]
  [ Evaluations: 0         Packets: 0         Bytes: 0           States: 0     ]