fedora16升级后没法上ipv6

我是新手，安装fedora16 将近一个月，今天提示有升级，但是升级之后我原来可以上的六维空间现在无法打开了，以前是安装好系统就自动能链接上，没有改过任何设置，我用的是教育网。我按网上提示改过/etc/sysconfig/network文件，加了NETWORKING_IPV6=yes，也修改过host，但是仍然上不去。求大侠指点。
以下是上ipv6测试网站返回的结果
You appear to have no IPv6 at this time..

You appear to have no IPv6 address.

It looks like you have only IPv4 Internet service at this time. Don't feel bad - most people are in this position right now. Most Internet service providers are not quite yet ready to provide IPv6 Internet to residential customers.

Many of the visitors to the site are new to what IPv6 is. If you don't know why IPv6 matters, see the Why IPv6 FAQ. This will give you a bit of background of what to expect with IPv4 in the coming months and years; and perhaps some incentive to ask your ISP when they will offer IPv6.

If you strongly believe you have IPv6, but we were unable to detect it: it means one of a couple of things. Either your organization is blocking the use of IPv6 to talk to the outside Internet through network policy; or perhaps what you see with IPv6 on your host is not a global address. Any address starting with "::", "fc", "fd", or "fe" are unable to work with the public IPv6 Internet.

If you are savvy with technology, you can be an early adopter of IPv6, consider learning more about 6to4 providers (managed 6to4 tunnel services). The use of automatic tunnels is discouraged. Windows users can also consider Teredo.


我用ifconfig -a检查过我系统的ipv6是否开启，显示如下：
[uranus@uranus ~]$ ifconfig -a
em1 Link encap:Ethernet HWaddr 44:37:E6:5D:F7:32
inet addr:172.16.4.24 Bcast:172.16.255.255 Mask:255.255.0.0
inet6 addr: 2001:cc0:2022:0:4637:e6ff:fe5d:f732/64 Scope:Global
inet6 addr: fe80::4637:e6ff:fe5d:f732/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:42136 errors:0 dropped:0 overruns:0 frame:0
TX packets:1450 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5080237 (4.8 MiB) TX bytes:187750 (183.3 KiB)
Interrupt:20 Memory:fb100000-fb120000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:68 errors:0 dropped:0 overruns:0 frame:0
TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4464 (4.3 KiB) TX bytes:4464 (4.3 KiB)

应该是开启了ipv6功能的，但是网页测试提示一直找不到ipv6地址，有人知道如何解决吗？