По итогу настройки
/ip firewall filter
add action=drop chain=forward comment="Rostelecom DPI" content="Location:
http://warning.rt.ru/\?" protocol=tcp in-interface=pppoe-out1
add action=drop chain=forward comment="Rostelecom DPI" in-interface=pppoe-out1 protocol=tcp src-port=443 tcp-flags=rst
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related disabled=yes