/ip firewall mangle
add action=mark-connection chain=prerouting connection-mark=no-mark dst-address-list=BlackList new-connection-mark=conn_isp_openvpn
add action=mark-connection chain=prerouting comment=Discord_RTC connection-bytes=102 connection-mark=no-mark content="\00\00\00\00\00\00\00\00\00\00\00\00\00\
    \00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\
    " dst-address-type=!local in-interface-list=LAN new-connection-mark=conn_isp_openvpn port=50000-50100 protocol=udp
add action=mark-routing chain=prerouting connection-mark=conn_isp_openvpn dst-address-type=!local in-interface-list=!WAN new-routing-mark=OPENVPN