Just installed for the first time and while testing I noted that the DNS server is not listening on IPv6. The server has both IPv4 and IPv6 addresses configured on the host and in the Enhance control panel, but there is nothing listening on port 53 TCP or UDP on the IPv6 address.
root@ns1:~# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:50:56:51:e6:46 brd ff:ff:ff:ff:ff:ff
altname enp0s18
inet 154.38.177.113/21 brd 154.38.183.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 2605:a143:2185:5994::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe51:e646/64 scope link
valid_lft forever preferred_lft forever
root@ns1:~# netstat -tunlp | grep docker-proxy
tcp 0 0 154.38.177.113:53 0.0.0.0:* LISTEN 1758/docker-proxy
tcp 0 0 0.0.0.0:41861 0.0.0.0:* LISTEN 1737/docker-proxy
tcp6 0 0 :::41861 :::* LISTEN 1744/docker-proxy
udp 0 0 154.38.177.113:53 0.0.0.0:* 1772/docker-proxy
lstein@serpens:~$ telnet 154.38.177.113 53
Trying 154.38.177.113...
Connected to 154.38.177.113.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
lstein@serpens:~$ telnet 2605:a143:2185:5994::1 53
Trying 2605:a143:2185:5994::1...
telnet: Unable to connect to remote host: Connection refused
