In the past 2 months I have been experience “no internet” on my router when I use 220.127.116.11 and 18.104.22.168 DNS servers. By “no internet” I mean that the router is keep showing ‘connecting…’ and the LED light for the Internet is orange. But I do have internet access. Moreover, even the NTP servers are not working to get the time.
I thought that the problem is with my router or some TP-Link service, but it appears that it is not. More about this can be found in my topic here: https://community.tp-link.com/en/home/forum/topic/204286