TP-Link firmware sends six DNS requests and one NTP query every 5 seconds
PSAAnyone with commodity routers, repeaters, etc. please check out LEDE project https://lede-project.org. Check if your device has support here - https://lede-project.org/toh/startLEDE firmware is amazing. You will be able to do a lot more with your router and they have quick security fixes. The recent krack vulnerability was fixed within 2 days after the announcement.