服务器DNS选择的问题

         今天发现服务器ping，baidu都要好长时间，多加了几个dns server就ok，但不同的dns的响应时间不尽相同。

         最终，/etc/resolv.conf的结果如下：

nameserver 114.114.114.114 nameserver 119.97.175.154 nameserver 8.8.8.8 nameserver 202.96.128.86

 

         下面是测试结果：

 

1、114.114.114.114：

 

[root@ fufangchun]# ping 114.114.114.114 PING 114.114.114.114 (114.114.114.114)   56(84) bytes of data. 64 bytes from 114.114.114.114: icmp_seq=1   ttl=65 time=7.39   ms 64 bytes from 114.114.114.114: icmp_seq=2   ttl=61 time=7.27 ms ^C --- 114.114.114.114 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss,   time 1548ms rtt min/avg/max/mdev =   7.277/7.336/7.396/0.104 ms

 

 

2、119.97.175.154：

        

湖北的。

[root@ fufangchun]# ping 119.97.175.154 PING 119.97.175.154 (119.97.175.154)   56(84) bytes of data. 64 bytes from 119.97.175.154: icmp_seq=1   ttl=52 time=16.5 ms ^C --- 119.97.175.154 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss,   time 792ms rtt min/avg/max/mdev =   16.529/16.529/16.529/0.000 ms

 

 

3、8.8.8.8：

[root@ fufangchun]# 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=3 ttl=43   time=159 ms ^C --- 8.8.8.8 ping statistics --- 3 packets transmitted, 1 received, 66% packet loss,   time 2971ms rtt min/avg/max/mdev =   159.999/159.999/159.999/0.000 ms

 

4、202.96.128.86：

 

         广东的。

[root@ fufangchun]# ping 202.96.128.86 PING 202.96.128.86 (202.96.128.86) 56(84)   bytes of data. ^C --- 202.96.128.86 ping statistics --- 24 packets transmitted, 0 received, 100% packet loss,   time 23602ms