CentOS 7
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BIND : Verify Resolution
2021/02/24
[1] Start and Enable BIND.
[root@dlp ~]#
systemctl enable --now named

[2] If Firewalld is running, allow DNS service. DNS uses [53/TCP,UDP].
[root@dlp ~]#
firewall-cmd --add-service=dns --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[3] Change DNS setting to refer to own DNS if need.
(replace [eth0] to your own environment).
[root@dlp ~]#
nmcli connection modify eth0 ipv4.dns 10.0.0.30

[root@dlp ~]#
nmcli connection down eth0; nmcli connection up eth0

[4] Verify Name and Address Resolution. If [ANSWER SECTION] is shown, that's OK.
[root@dlp ~]#
dig dlp.srv.world.


; <<>> DiG 9.11.26-RedHat-9.11.26-3.el8 <<>> dlp.srv.world.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3163
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: b70c1b6e341746c86e2774056035b727aadd8ca9e912fddb (good)
;; QUESTION SECTION:
;dlp.srv.world.                 IN      A

;; ANSWER SECTION:
dlp.srv.world.          86400   IN      A       10.0.0.30

;; AUTHORITY SECTION:
srv.world.              86400   IN      NS      dlp.srv.world.

;; Query time: 0 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Wed Feb 23 21:17:11 JST 2021
;; MSG SIZE  rcvd: 100

[root@dlp ~]#
dig -x 10.0.0.30


; <<>> DiG 9.11.26-RedHat-9.11.26-3.el8 <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12042
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: e6b32b71d24b4df1ea56aab36035b75f1e3fb6f5d409f7a4 (good)
;; QUESTION SECTION:
;30.0.0.10.in-addr.arpa.                IN      PTR

;; ANSWER SECTION:
30.0.0.10.in-addr.arpa. 86400   IN      PTR     dlp.srv.world.

;; AUTHORITY SECTION:
0.0.10.in-addr.arpa.    86400   IN      NS      dlp.srv.world.

;; ADDITIONAL SECTION:
dlp.srv.world.          86400   IN      A       10.0.0.30

;; Query time: 0 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Wed Feb 23 21:18:07 JST 2021
;; MSG SIZE  rcvd: 136
Matched Content