谷歌的免费DNS服务8.8.8.8

周海汉 /文

 

从谷奥得到消息 ，google推出了两个非常好记的DNS服务器。那就是

 

8.8.8.8

8.8.4.4

 

经本人测试可用。有人说4.4.4.4和4.3.2.1也是，经过我测试，这两个IP可以ping通，但并不能做DNS 解析。

 

下面是测试经过：

zhouhh@zhhofs:~$ ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_seq=1 ttl=240 time=200 ms 64 bytes from 8.8.8.8: icmp_seq=2 ttl=240 time=84.7 ms ^C --- 8.8.8.8 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 84.771/142.731/200.691/57.960 ms zhouhh@zhhofs:~$ ping 8.8.4.4 PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data. 64 bytes from 8.8.4.4: icmp_seq=1 ttl=240 time=111 ms 64 bytes from 8.8.4.4: icmp_seq=2 ttl=240 time=113 ms ^C --- 8.8.4.4 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 111.370/112.358/113.346/0.988 ms zhouhh@zhhofs:~$ ping 4.3.2.1 PING 4.3.2.1 (4.3.2.1) 56(84) bytes of data. 64 bytes from 4.3.2.1: icmp_seq=1 ttl=240 time=107 ms 64 bytes from 4.3.2.1: icmp_seq=2 ttl=240 time=102 ms ^C --- 4.3.2.1 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 102.059/104.628/107.198/2.589 ms zhouhh@zhhofs:~$ nslookup 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: 8.8.8.8.in-addr.arpa name = google-public-dns-a.google.com. Authoritative answers can be found from: zhouhh@zhhofs:~$ nslookup 8.8.4.4 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: 4.4.8.8.in-addr.arpa name = google-public-dns-b.google.com. Authoritative answers can be found from: zhouhh@zhhofs:~$ nslookup 4.4.4.4 Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find 4.4.4.4.in-addr.arpa.: NXDOMAIN zhouhh@zhhofs:~$ nslookup 4.3.2.1 Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find 1.2.3.4.in-addr.arpa: SERVFAIL zhouhh@zhhofs:~$ nslookup 1.2.3.4 Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find 4.3.2.1.in-addr.arpa.: NXDOMAIN zhouhh@zhhofs:~$ nslookup > server 8.8.8.8 Default server: 8.8.8.8 Address: 8.8.8.8#53 > set type=a > google.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: google.com Address: 74.125.53.100 Name: google.com Address: 74.125.67.100 Name: google.com Address: 74.125.45.100 > sohu.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: sohu.com Address: 61.135.181.176 Name: sohu.com Address: 61.135.181.175 > server 4.4.4.4 Default server: 4.4.4.4 Address: 4.4.4.4#53 > set type a *** Invalid option: type > set type = a *** Invalid option: type > set type=a > google.com ^C 解析失败，超时 zhouhh@zhh64:~$ nslookup > server 4.3.2.1 Default server: 4.3.2.1 Address: 4.3.2.1#53 > sohu.com Server: 4.3.2.1 Address: 4.3.2.1#53 Non-authoritative answer: Name: sohu.com Address: 61.135.181.176 Name: sohu.com Address: 61.135.181.175 > set type a *** Invalid option: type > set type = a *** Invalid option: type > set type=a > sohu.com Server: 4.3.2.1 Address: 4.3.2.1#53 Non-authoritative answer: Name: sohu.com Address: 61.135.181.175 Name: sohu.com Address: 61.135.181.176 > server 4.4.4.4 Default server: 4.4.4.4 Address: 4.4.4.4#53 > set type=a > sohu.com ^C 4.4.4.4不通，4.3.2.1是通的。

说明8.8.8.8，8.8.4.4可用。

后经补充测试， 4.3.2.1可用。

 

8.8.8.8、8.8.4.4和4.3.2.1不用担心域名绑架，但8.8.8.8、8.8.4.4和4.3.2.1有可能遭GFW封杀。

 

ps：后来一晚上给一个女生解决网络问题，配IP地址，在DNS 配了8.8.8.8，结果她问，“DNS 这个随便配一个就行了，是吧？” 8.8.8.8实在太吉祥太吉利太好记了，搞得大家都不相信。