TP-Link firmware sends six DNS requests and one NTP query every 5 seconds
This issue has been fixed by a new firmware release from TP-Link. The updated firmware changes the behavior to use ICMP pings on the local network rather than NTP+DNS requests out on the public internet.
<a href="https://www.ctrl.blog/entry/ntplink-fixed" rel="nofollow">https://www.ctrl.blog/entry/ntplink-fixed</a>