@stephenw10 said in DNS Resolver:
It looks like you have something set that means it's to do a reverse lookup on all IPs. Anything that doesn't resolve is shown in that form which is why you're seeing a whole bunch of 'in-addr.arpa' logs.
I think you are on to something here, "all the IP's"... which do seem to be spread across the world, and made me think of pfBlocker...
Which in fact seems to be what is behind most of it (could Suricata be the other??). Anyway, I quickly found that two of the IP's which came up 4-5 times in the last 15 minutes, and do not resolve, are on pfBlocker lists, like "pfB_Top_v4"...
Yes, if an address has a PTR record then I'd expect it to show a domain there.
Steve
Interestingly it seems the issue with internal IP's and/or my employers site are no longer there. Not sure what I did but I was going through the settings earlier today and I think had "ignore remote DNS servers" active (under system > general). For sure it's at the default setting now, and I have to go back several hours in the logs to find those IP's in the list as in-addr.arpa...
Could that setting change have made this difference?
Anyhow, seem the problem is solved, or at least I have a better understanding now. I do still have to look for a simple way to skip those items in the analyzer...
The output of Diag > DNS Lookup shows all configured DNS servers not just those in use by the system or by clients. That's expected.
So I guess I shouldn't worry then... In fact I can of course remove those servers completely on that page and things still work.