谷歌的免费DNS服务8.8.8.8

abloz 2009-12-08
2009-12-08

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：

  1. zhouhh@zhhofs:~$ ping 8.8.8.8
  2. PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
  3. 64 bytes from 8.8.8.8: icmp_seq=1 ttl=240 time=200 ms
  4. 64 bytes from 8.8.8.8: icmp_seq=2 ttl=240 time=84.7 ms
  5. ^C
  6. — 8.8.8.8 ping statistics —
  7. 2 packets transmitted, 2 received, 0% packet loss, time 1000ms
  8. rtt min/avg/max/mdev = 84.771/142.731/200.691/57.960 ms
  9. zhouhh@zhhofs:~$ ping 8.8.4.4
  10. PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data.
  11. 64 bytes from 8.8.4.4: icmp_seq=1 ttl=240 time=111 ms
  12. 64 bytes from 8.8.4.4: icmp_seq=2 ttl=240 time=113 ms
  13. ^C
  14. — 8.8.4.4 ping statistics —
  15. 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
  16. rtt min/avg/max/mdev = 111.370/112.358/113.346/0.988 ms
  17. zhouhh@zhhofs:~$ ping 4.3.2.1
  18. PING 4.3.2.1 (4.3.2.1) 56(84) bytes of data.
  19. 64 bytes from 4.3.2.1: icmp_seq=1 ttl=240 time=107 ms
  20. 64 bytes from 4.3.2.1: icmp_seq=2 ttl=240 time=102 ms
  21. ^C
  22. — 4.3.2.1 ping statistics —
  23. 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
  24. rtt min/avg/max/mdev = 102.059/104.628/107.198/2.589 ms
  25. zhouhh@zhhofs:~$ nslookup 8.8.8.8
  26. Server: 8.8.8.8
  27. Address: 8.8.8.8#53
  28. Non-authoritative answer:
  29. 8.8.8.8.in-addr.arpa name = google-public-dns-a.google.com.
  30. Authoritative answers can be found from:
  31. zhouhh@zhhofs:~$ nslookup 8.8.4.4
  32. Server: 8.8.8.8
  33. Address: 8.8.8.8#53
  34. Non-authoritative answer:
  35. 4.4.8.8.in-addr.arpa name = google-public-dns-b.google.com.
  36. Authoritative answers can be found from:
  37. zhouhh@zhhofs:~$ nslookup 4.4.4.4
  38. Server: 8.8.8.8
  39. Address: 8.8.8.8#53
  40. ** server can’t find 4.4.4.4.in-addr.arpa.: NXDOMAIN
  41. zhouhh@zhhofs:~$ nslookup 4.3.2.1
  42. Server: 8.8.8.8
  43. Address: 8.8.8.8#53
  44. ** server can’t find 1.2.3.4.in-addr.arpa: SERVFAIL
  45. zhouhh@zhhofs:~$ nslookup 1.2.3.4
  46. Server: 8.8.8.8
  47. Address: 8.8.8.8#53
  48. ** server can’t find 4.3.2.1.in-addr.arpa.: NXDOMAIN
  49. zhouhh@zhhofs:~$ nslookup

  50. server 8.8.8.8

  51. Default server: 8.8.8.8
  52. Address: 8.8.8.8#53

  53. set type=a

  54. google.com

  55. Server: 8.8.8.8
  56. Address: 8.8.8.8#53
  57. Non-authoritative answer:
  58. Name: google.com
  59. Address: 74.125.53.100
  60. Name: google.com
  61. Address: 74.125.67.100
  62. Name: google.com
  63. Address: 74.125.45.100

  64. sohu.com

  65. Server: 8.8.8.8
  66. Address: 8.8.8.8#53
  67. Non-authoritative answer:
  68. Name: sohu.com
  69. Address: 61.135.181.176
  70. Name: sohu.com
  71. Address: 61.135.181.175

  72. server 4.4.4.4

  73. Default server: 4.4.4.4
  74. Address: 4.4.4.4#53

  75. set type a

  76. *** Invalid option: type

  77. set type = a

  78. *** Invalid option: type

  79. set type=a

  80. google.com

  81. ^C
  82. 解析失败，超时
    1. zhouhh@zhh64:~$ nslookup

  84. server 4.3.2.1

  85. Default server: 4.3.2.1
  86. Address: 4.3.2.1#53

  87. sohu.com

  88. Server: 4.3.2.1
  89. Address: 4.3.2.1#53
    1. Non-authoritative answer:
  91. Name: sohu.com
  92. Address: 61.135.181.176
  93. Name: sohu.com
  94. Address: 61.135.181.175
  95. & gt; set type a
  96. *** Invalid option: type

  97. set type = a

  98. *** Invalid option: type

  99. set type=a

  100. sohu.com

  101. Server: 4.3.2.1
  102. Address: 4.3.2.1#53
    1. Non-authoritative answer:
  104. Name: sohu.com
  105. Address: 61.135.181.175
  106. Name: sohu.com
  107. Address: 61.135.181.176

  108. server 4.4.4.4

  109. Default server: 4.4.4.4
  110. Address: 4.4.4.4#53

  111. set type=a

  112. sohu.com

  113. ^C
  114. 4.4.4.4不通，4.3.2.1是通的。

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。

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