BIND : Verify Resolution

 [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 [ens2] to your own environment).

[root@dlp ~]# nmcli connection modify ens2 ipv4.dns 10.0.0.30

[root@dlp ~]# nmcli connection down ens2; nmcli connection up ens2

[4] Verify Name and Address Resolution. If [ANSWER SECTION] is shown, that's OK.

[root@dlp ~]# dig dlp.srv.world.


; <<>> DiG 9.11.4-P2-RedHat-9.11.4-17.P2.el8_0.1 <<>> dlp.srv.world.

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4141

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

; COOKIE: 0e9ca06c44ffe5e20209ad655d954316681848d8675423ab (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: Thu Oct 02 19:38:46 JST 2019

;; MSG SIZE  rcvd: 100

[root@dlp ~]# dig -x 10.0.0.30

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-17.P2.el8_0.1 <<>> -x 10.0.0.30

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61063

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

; COOKIE: cf5c64acd453263666c674db5d9543400d47bea92e41b7e1 (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: Thu Oct 02 19:39:28 JST 2019

;; MSG SIZE  rcvd: 136



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