诡异的www.google.com无法访问

中国电信在搞什么鬼?

在宿舍ping的通 却访问不了 宿舍是深圳电信ADSL
而奇怪的是 同一时刻 在公司就可以访问
我观察到 公司和宿舍 www.google.com 的ip有互换的现象 但前后公司都可以访问 宿舍都不能访问 请看下面的ping记录

宿舍:

C:\Documents and Settings\Andrew>ping www.google.com

Pinging www-china.l.google.com [64.233.189.99] with 32 bytes of data:

Reply from 64.233.189.99: bytes=32 time=52ms TTL=243
Reply from 64.233.189.99: bytes=32 time=69ms TTL=243
Reply from 64.233.189.99: bytes=32 time=46ms TTL=243
Reply from 64.233.189.99: bytes=32 time=70ms TTL=243

Ping statistics for 64.233.189.99:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 46ms, Maximum = 70ms, Average = 59ms

C:\Documents and Settings\Andrew>ping www.google.com

Pinging www-china.l.google.com [64.233.189.104] with 32 bytes of data:

Reply from 64.233.189.104: bytes=32 time=25ms TTL=243
Reply from 64.233.189.104: bytes=32 time=47ms TTL=243
Reply from 64.233.189.104: bytes=32 time=24ms TTL=243
Reply from 64.233.189.104: bytes=32 time=76ms TTL=243

Ping statistics for 64.233.189.104:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 24ms, Maximum = 76ms, Average = 43ms

公司:
C:\Documents and Settings\AndrewGao>PING www.google.com

Pinging www-china.l.google.com [64.233.189.104] with 32 bytes of data:

Reply from 64.233.189.104: bytes=32 time=9ms TTL=243
Reply from 64.233.189.104: bytes=32 time=9ms TTL=243
Reply from 64.233.189.104: bytes=32 time=10ms TTL=243
Reply from 64.233.189.104: bytes=32 time=10ms TTL=243

Ping statistics for 64.233.189.104:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 9ms, Maximum = 10ms, Average = 9ms

C:\Documents and Settings\AndrewGao>PING www.google.com

Pinging www-china.l.google.com [64.233.189.99] with 32 bytes of data:

Reply from 64.233.189.99: bytes=32 time=9ms TTL=243
Reply from 64.233.189.99: bytes=32 time=10ms TTL=243
Reply from 64.233.189.99: bytes=32 time=10ms TTL=243
Reply from 64.233.189.99: bytes=32 time=9ms TTL=243

Ping statistics for 64.233.189.99:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 9ms, Maximum = 10ms, Average = 9ms