I am trying to setup Pihole/WireGuard VPN, but after a system reboot, it doesn't work anymore.
It comes down to the fact outgoing DNS is not resolving.
When I am in the pi-hole box, I ran the following command
Domain auto-resolve via DNS to IPv6 address, IPv6 don't work
ping -v google.com
PING google.com(ord36s01-in-x0e.1e100.net (2607:f8b0:4009:80c::200e)) 56 data bytes
From 2000:5000:200:2000:10 (2000:5000:200:2000:10) icmp_seq=1 Destination unreachable: Address unreachable
From 2000:5000:200:2000:10 (2000:5000:200:2000:10) icmp_seq=5 Destination unreachable: Address unreachable
From 2000:5000:200:2000:10 (2000:5000:200:2000:10) icmp_seq=6 Destination unreachable: Address unreachable
From 2000:5000:200:2000:10 (2000:5000:200:2000:10) icmp_seq=7 Destination unreachable: Address unreachable
IPv4 works
ping 216.58.194.174
PING 216.58.194.174 (216.58.194.174) 56(84) bytes of data.
64 bytes from 216.58.194.174: icmp_seq=1 ttl=109 time=78.0 ms
64 bytes from 216.58.194.174: icmp_seq=2 ttl=109 time=77.9 ms
64 bytes from 216.58.194.174: icmp_seq=3 ttl=109 time=78.0 ms
May I ask how do I resolve this?