High Priortiy ICPM (Ping)

In this configuration we use MikroTik RouterBOARD wAP 2nD r2 with firmware 6.42.7
1. Create Mangle
    A. Create Mark Connection
/ip firewall mangle
add action=mark-connection chain=prerouting new-connection-mark=icmp-con passthrough=yes protocol=icmp
add action=mark-connection chain=postrouting new-connection-mark=icmp-con passthrough=yes protocol=icmp

    B. Create Mark Packet
/ip firewall mangle
add action=mark-packet chain=prerouting connection-mark=icmp-con new-packet-mark=icmp-pkt passthrough=no protocol=icmp
add action=mark-packet chain=postrouting connection-mark=icmp-con new-packet-mark=icmp-pkt passthrough=no protocol=icmp

2. Create Simple Queue
/queue simple
add max-limit=1M/1M name=ICMP packet-marks=icmp-pkt target="0.0.0.0/0"