I have a basic DNS setup for a home UTM configuration. The UTM is the only DNS server and also the DHCP server. All internal devices have DNS configured with the UTM LAN address as their DNS server. DHCP is also configured to provide the UTM's LAN address as the DNS server in the UTM DNS Forwarders tab, I have configured a list of four individual public DNS servers with low ping times. I have also tried the "Use forwarders assigned by ISP" setting. It works, in general, whether "use ISP forwarders" is enabled or disabled, but:
1. It fails sometimes. I think that the UTM may be accepting the first response it receives and ignoring anything else. The problem with that is if the first response is "not found" then any response from other public DNS servers (forwarders) with the correct IP address are ignored. Is that right?
2. The Support -> Tools -> DNS Lookup tool is using a deprecated query, which gets an error response from some DNS servers. Here is an example. I replaced the actual host and domain name with "host.example.com":
Trying "host.example.com"
( ... )
;; QUESTION SECTION:
;host.example.com. IN ANY
;; ANSWER SECTION:
host.example.com. 3789 IN HINFO "RFC8482" ""
... and the DNS lookup fails - no host IP address returned.
- - - -
That seems to be a bug in the UTM DNS Lookup tool - it should not be issuing DNS queries with "ANY". I wonder whether the UTM does that with its own forwarded DNS requests, too?
-> What am I missing in my DNS configuration so that it works reliably?
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