dig 172.16.96.20
Do you mean dig -x 172.16.96.20
dig 1.1.1.1 doesn't return the host name:
You can see running dig followed by an IP doesn't return anything, to do a reverse DNS lookup, or to resolve the hostname from the IP, you can see in the second example dig -x followed by the IP returns the hostname one.one.one.one.
$ dig 1.1.1.1
; <<>> DiG 9.16.24-RH <<>> 1.1.1.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 42214 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;1.1.1.1. IN A
;; AUTHORITY SECTION: . 60 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022022101 1800 900 604800 86400
;; Query time: 241 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Feb 21 18:53:50 EST 2022 ;; MSG SIZE rcvd: 111
# dig -x 1.1.1.1
; <<>> DiG 9.16.24-RH <<>> -x 1.1.1.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63485 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;1.1.1.1.in-addr.arpa. IN PTR
;; ANSWER SECTION: 1.1.1.1.in-addr.arpa. 1131 IN PTR one.one.one.one.
;; Query time: 74 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Feb 21 18:53:57 EST 2022 ;; MSG SIZE rcvd: 78
; <<>> DiG 9.16.24-RH <<>> 172.16.96.20 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 47273 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;172.16.96.20. IN A
;; AUTHORITY SECTION: . 6751 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022022101 1800 900 604800 86400
;; Query time: 1 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Feb 21 14:39:02 PST 2022 ;; MSG SIZE rcvd: 116
dig centos8-opstcore-vm.homenet172-16-96.com
; <<>> DiG 9.16.24-RH <<>> centos8-opstcore-vm.homenet172-16-96.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26457 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;centos8-opstcore-vm.homenet172-16-96.com. IN A
;; ANSWER SECTION: centos8-opstcore-vm.homenet172-16-96.com. 4778 IN A 172.16.96.20
;; Query time: 0 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Feb 21 14:40:16 PST 2022 ;; MSG SIZE rcvd: 85
I tried stopping and restarting systemd-resolved to no avail as well as restarting the network interface also to no avail.
What's curious is for example
host 192.168.10.2 will return a host name most likely because it's cached.
host 172.16.96.20 results in host not found on one F34 system and no servers could be reached on the other F34 system
I ran wireshark on the DNS server and it showed the query to 127.0.0.53 with the hostname and a response of the ip address. But a query to 127.0.0.53 with the ip address returned a not found error.
At first I didn't like this new way to manage DNS, but I am finding some of the features to work very well. Like the split dns feature is working really well with the multiple vpn clients run simultaneously, no more hacking on /etc/resolv.conf each time a new VPN is started, it just works.
1 - https://fedoraproject.org/wiki/Changes/systemd-resolved
Regards, -Jamie
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