我想prdns还是被抢答

[liang-hiwin]

第一次查询www.google.com的ip结果为31.13.73.1
第二次查询www.google.com的ip结果为31.13.73.1
第三次查询www.google.com的ip结果为172.217.27.132
`root@iZwz9d1rjhrzzxa4lsoi93Z:~# dig www.google.com @127.0.0.1 -p 5400

; <<>> DiG 9.10.3-P4-Debian <<>> www.google.com @127.0.0.1 -p 5400
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23259
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
www.google.com. 60 IN A 31.13.73.1

;; Query time: 32 msec
;; SERVER: 127.0.0.1#5400(127.0.0.1)
;; WHEN: Sun Apr 12 11:26:42 CST 2020
;; MSG SIZE rcvd: 48

root@iZwz9d1rjhrzzxa4lsoi93Z:~# dig www.google.com @127.0.0.1 -p 5400

; <<>> DiG 9.10.3-P4-Debian <<>> www.google.com @127.0.0.1 -p 5400
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46933
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
www.google.com. 60 IN A 31.13.73.1

;; Query time: 32 msec
;; SERVER: 127.0.0.1#5400(127.0.0.1)
;; WHEN: Sun Apr 12 11:26:53 CST 2020
;; MSG SIZE rcvd: 48

root@iZwz9d1rjhrzzxa4lsoi93Z:~# dig www.google.com @127.0.0.1 -p 5400

; <<>> DiG 9.10.3-P4-Debian <<>> www.google.com @127.0.0.1 -p 5400
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57115
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
www.google.com. 119 IN A 172.217.27.132

;; Query time: 35 msec
;; SERVER: 127.0.0.1#5400(127.0.0.1)
;; WHEN: Sun Apr 12 11:26:56 CST 2020
;; MSG SIZE rcvd: 48
`