1. I see a public WAN with DoT enabled
2. 1.1.1.1 working
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=58 time=3.241 ms
64 bytes from 1.1.1.1: seq=1 ttl=58 time=3.139 ms
64 bytes from 1.1.1.1: seq=2 ttl=58 time=3.162 ms
64 bytes from 1.1.1.1: seq=3 ttl=58 time=3.160 ms
64 bytes from 1.1.1.1: seq=4 ttl=58 time=3.137 ms
--- 1.1.1.1 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 3.137/3.167/3.241 ms
3. Nslookup fails
4. Log when DoT enabled
https://pastebin.com/raw/n4ALy2de
5. Actually DoT is working when v39E3 is installed
Router is MIPS AC66U
What I see here is that NTP is not causing the issue because when I set Google 216.239.35.0 NTP, time sync.
It's a DNS resolver issue.