[Definition]
  actionstart = iptables -N f2b-docker
              iptables -A f2b-docker -j RETURN
              iptables -I FORWARD -p tcp -m multiport --dports 25,80,443,465,993,4190 -j f2b-docker
  
  actionstop = iptables -D FORWARD -p tcp -m multiport --dports 25,80,443,465,993,4190 -j f2b-docker
             iptables -F f2b-docker
             iptables -X f2b-docker
  
  actioncheck = iptables -n -L FORWARD | grep -q 'f2b-docker[ \t]'
  
  actionban = iptables -I f2b-docker 1 -s <ip> -j DROP
  
  actionunban = iptables -D f2b-docker -s <ip> -j DROP