root@OpenWrt:~# dig @62.109.121.1 google.com A +notcp

; <<>> DiG 9.11.2-P1 <<>> @62.109.121.1 google.com A +notcp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 59207
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDIT
IONAL: 0

;; QUESTION SECTION:
;google.com.                    IN      A

;; Query time: 42 msec
;; SERVER: 62.109.121.1#53(62.109.121.1)
;; WHEN: Wed Apr 17 09:46:04 CEST 2019
;; MSG SIZE  rcvd: 28

root@OpenWrt:~# dig @62.109.121.1 google.com A +tcp

; <<>> DiG 9.11.2-P1 <<>> @62.109.121.1 google.com A +tcp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 13504
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDIT
IONAL: 0

;; QUESTION SECTION:
;google.com.                    IN      A

;; Query time: 42 msec
;; SERVER: 62.109.121.1#53(62.109.121.1)
;; WHEN: Wed Apr 17 09:46:51 CEST 2019
;; MSG SIZE  rcvd: 28

root@OpenWrt:~# dig @8.8.8.8 google.com +notcp

; <<>> DiG 9.11.2-P1 <<>> @8.8.8.8 google.com +notcp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34469
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDIT
IONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com.                    IN      A

;; ANSWER SECTION:
google.com.             299     IN      A       216.58.206.1
10

;; Query time: 35 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed Apr 17 09:47:14 CEST 2019
;; MSG SIZE  rcvd: 55