Ultralow servers in Vietnam are unstable 10/05/2023
Since the greencloud-han server moved the datacenter from Viettel to FPT, the server is routing to HongKong. DNS queries are redirected to the anexia-han server, making ultralow servers unstable.
I did the test using Mikrotik's traceroute tool, the results averaged over 146ms (dns1.nextdns.io). Meanwhile, routing to dns2.nextdns.io has to go through nodes (from 9 to 12) in HongKong.
Currently, the query to the ultralow servers in Vietnam is currently unstable. Unstable frequency occurs more often in the evening.
Please check and fix it.
Update: Maybe dns1.nextdns.io fixed it, ping is no longer more than 3xx ms.
dns2.nextdns.io accessed from Viettel ISP still routing to HongKong