THE 2-MINUTE RULE FOR WINBOX

/ip firewall filter insert chain=input link-state=proven,connected action=take remark="accept set up,relevant"; add chain=input link-point out=invalid motion=fall; include chain=input in-interface=ether1 protocol=icmp action=settle for remark="enable ICMP"; increase chain=input in-interface=ether1 protocol=tcp port=8291 action=settle for comment="a