rb 411 AR at the interfaces with the command shows the torch tx 7Mbit/rx 0Mbit, the MT when pumping more than 6 Mbps pings 300-400. What could it be? wifi (built-in card) and lan bridge. If you change the firmware with the same result.

I don’t understand the problem. You are asking where this traffic comes from?
[admin@MikroTik] > tool torch ether1 src-address=0.0.0.0/0
this will show you specifically which IP the traffic comes from
or better yet, use Torch in winbox, it’s easier to use.
Do I so understand that torch must show an outgoing traffic on interface how and entering? He why that stands on 0