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ubuntu@VM-0-15-ubuntu:~$ host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 115.239.211.112
www.a.shifen.com has address 115.239.210.27
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$ nslookup www.baidu.com
Server: 183.60.83.19
Address: 183.60.83.19#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 115.239.210.27
Name: www.a.shifen.com
Address: 115.239.211.112
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$ dig www.baidu.com
; <<>> DiG 9.10.3-P4-Ubuntu <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21805
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 123 IN CNAME www.a.shifen.com.
www.a.shifen.com. 286 IN A 115.239.211.112
www.a.shifen.com. 286 IN A 115.239.210.27
;; Query time: 1 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Tue Oct 23 18:58:16 CST 2018
;; MSG SIZE rcvd: 101
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$
ubuntu@VM-0-15-ubuntu:~$ dig @8.8.8.8 www.baidu.com
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @8.8.8.8 www.baidu.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9526
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 1067 IN CNAME www.a.shifen.com.
www.a.shifen.com. 299 IN A 115.239.211.112
www.a.shifen.com. 299 IN A 115.239.210.27
;; Query time: 88 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Oct 23 18:58:36 CST 2018
;; MSG SIZE rcvd: 101
ubuntu@VM-0-15-ubuntu:~$ 注意下那个Query time, 其余的不多说。