Why in the logs of the modem gives the same string?

Good day, help with this situation.
I have a router "zyXel Keenetic Lite" , entered the settings myself, half intuitive. The network was, but ping is not sent . Me in those to support told that DNS addresses are entered wrong or not there, well advised to put automatic DNS.
I put in , and all perfectly plows, but very confused one that logs the log is constantly written here is
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


All anything, but with the frequency that it produces , I was very alarming.
Help who knows or have faced, because on the forums found nothing. Thank you !
March 12th 20 at 08:10
1 answer
March 12th 20 at 08:12
Solution
This is normal behavior.
The feature of Wi-Fi is a kind of pings to the client.
Well, just normal, I'm calm ) thank you! - dallas.Ra commented on March 12th 20 at 08:15

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