北京时间下午4点25左右，发现google上不去了，没在意，ping发现不通。
过了一小会儿再ping，发现通了，可是IP地址改过了
[/sun/labs/]ping google.com
PING google.com ( 72.14.207.99) 56(84) bytes of data.
--- google.com ping statistics ---
99 packets transmitted, 0 received, 100% packet loss, time 98110ms
[/sun/labs/]ping google.com
PING google.com (64.233.167.99) 56(84) bytes of data.
--- google.com ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 6000ms