On 21 Feb 2022, at 20:15, Paolo Galtieri pgaltieri@gmail.com wrote:
Folks, I have 3 Linux systems, one running F31 and 2 running F34. On one of the F34 systems I have a local DNS server running. This has worked fine in the past, but now I'm seeing strangeness on the 2 F34 systems.
F31 is real old now.
I added a host to the DNS server for normal lookup and reverse lookup. On the F31 system both:
host centos8-opstcore-vm.homenet172-16-96.com
and
host 172.16.96.20
work. The first returns 172.16.96.20 and the second returns centos8-opstcore-vm.homenet172-16-96.com.
On the F34 which is the DNS server the first works, but the second fails with:
Host 20.96.16.172.in-addr.arpa. not found: 3(NXDOMAIN)
On the other F34 system I get:
host 172.16.96.20
;; connection timed out; no servers could be reached
The interface has the DNS server pointing to the correct system. If I run:
nslookup
server 192.168.10.66
Default server: 192.168.10.66 Address: 192.168.10.66#53
172.16.96.20
20.96.16.172.in-addr.arpa name = centos8-opstcore-vm.homenet172-16-96.com.
Then it works.
What do I need to do on F34 systems to get DNS lookups working?
Any help is appreciated.
I would check what is in /etc/resolv.conf for both machines. Do you have any dns caching on any of the hosts?
If you can repro at will next I would use wireshark to see what is send for the look ups.
Barry
Paolo
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