BIND : Verify Resolution2021/07/23

[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

success
[root@dlp ~]#

firewall-cmd --runtime-to-permanent

success

[3]	Change DNS setting to refer to own DNS if need. (replace [enp1s0] to your own environment).

[root@dlp ~]#

nmcli connection modify enp1s0 ipv4.dns 10.0.0.30

[root@dlp ~]#

nmcli connection down enp1s0; nmcli connection up enp1s0

[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-9.11.26-4.el8_4 <<>> dlp.srv.world.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20670
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 2572bcc863da9aa58e57622b60fa26143defacac44ae02c0 (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: 2 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Fri Jul 23 11:14:44 JST 2021
;; MSG SIZE  rcvd: 100

[root@dlp ~]#

dig -x 10.0.0.30


; <<>> DiG 9.11.26-RedHat-9.11.26-4.el8_4 <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48654
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: aa08f9bee92cda6007249c8460fa2659414ec92b1db8c4cb (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: Fri Jul 23 11:15:53 JST 2021
;; MSG SIZE  rcvd: 136

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