Why does it show the same line in the modem logs?

Question

Computer networks

Good day, help with this situation.
I have a "zyXel Keenetic Lite" router, I entered the settings myself, half intuitively. The network was, but the ping did not send. I was told in those support that the DNS addresses were entered incorrectly or in the wrong place, well, they advised me to set automatic DNS.
I set it, and everything works fine, but one thing is very confusing, that in the logs of the log, this is constantly written

Oct 10 20:02:00ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:02ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:04ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:06ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:08ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:10ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:12ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:14ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:16ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:18ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:19ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00
Oct 10 20:02:21ndmkernel: probe request: SSID=, BSSID=00:00:00:00:00:00

Everything would be fine, but with the periodicity that he gives out, I'm very worried.
Help, who knows or has come across, tk. I didn't find anything on the forums. Thank you !

Answer 1

This is normal behavior.
A feature of WiFi is a kind of ping to the client.