I realized that I have a very bad Ping in games. I have all the cables disconnected and WLAN, to see if another device is responsible for ensuring. Then I saw on the Mikrotik I have high traffic. What can that be?

Device: RB2011UiAS-2HnD
FW: 6.28
ISP: Cable Modem (GIB-Solutions AG, Switzerland)

OMG, I had activated under DNS Settings Allow Remote Requests!

dns amplification attack exploiting mikrotik open dns to external interface

That's UDP/53 traffic -- mainly DNS Amplification Attack to victim host 212.35.2.113.

Mikrotik, please make option IP - DNS - Allow remote requests by default turned OFF.

I see already 3-rd case of this attack on just installed our customers' RouterBoards.
All of them have a real IP-addresses, and they often do not even see that kind of traffic, but they hurts our WISP network.

That's UDP/53 traffic -- mainly DNS Amplification Attack to victim host 212.35.2.113.

Mikrotik, please make option IP - DNS - Allow remote requests by default turned OFF.

I see already 3-rd case of this attack on just installed our customers' RouterBoards.
All of them have a real IP-addresses, and they often do not even see that kind of traffic, but they hurts our WISP network.

It is off by default, if you have no other config.
On home routers, it is ON, but so is firewall. There are no devices where you will have "allow remote requests" + no firewall ...