Bind9 - How to allow DNS lookup from any machine

Solution 1:

I wonder if this is just an issue of reading nslookup's rather strange output.

This bit right here is the answer:

Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4006:819::200e
          172.217.12.142

The part you are asking about, right here is not all that crucial:

Server:  UnKnown
Address:  MYDNSIP

This is a purely informational representation of the server that nslookup queried (not about the query itself or its response), and I suppose the implication of "UnKnown" here is that nslookup could not find the name of the nameserver, it only knew it by IP address. Presumably this may mean that there is no reverse entry for the IP of the nameserver.

My suggestion would be to use dig instead for any kind of troubleshooting exercise as that has both more detailed output (essentially pretty-printing the whole response) and a more rational output style.