ipv6安装成功，却打不开六维。

我是xp的系统，安装了ipv6，应该是成功的，ping可以通；如：
Pinging 2001:da8:8007:1::3 with 32 bytes of data:

Reply from 2001:da8:8007:1::3: time=506ms
Reply from 2001:da8:8007:1::3: time=513ms
Request timed out.
Reply from 2001:da8:8007:1::3: time=553ms

Ping statistics for 2001:da8:8007:1::3:
    Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
    Minimum = 506ms, Maximum = 553ms, Average = 524ms
而且，ipv6.google.com　也可以打开，但打不开六维的网站（http://bt.neu6.edu.cn/），为什么呢？


谢谢