关于ubuntu12.04使用ipv6的问题

[zhangzimou]

我按照网上的教程做，安装了miredo,输入ifconfig后显示如下信息：
eth0 Link encap:Ethernet HWaddr 30:85:a9:75:6e:d2
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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:19294 errors:0 dropped:0 overruns:0 frame:0
TX packets:19294 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2171711 (2.1 MB) TX bytes:2171711 (2.1 MB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.1.221 P-t-P:115.154.191.37 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1400 Metric:1
RX packets:884184 errors:0 dropped:0 overruns:0 frame:0
TX packets:638601 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:1184143975 (1.1 GB) TX bytes:41936430 (41.9 MB)

teredo Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet6 addr: fe80::ffff:ffff:ffff/64 Scope:Link
inet6 addr: 2001:0:53aa:64c:38ee:3215:8c65:40da/32 Scope:Global
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1280 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:144 (144.0 B)

wlan0 Link encap:Ethernet HWaddr 74:e5:43:e7:62:2d
inet addr:115.154.109.191 Bcast:115.154.109.255 Mask:255.255.255.0
inet6 addr: 2001:250:1001:2176:a997:fb5a:e0cf:f96b/64 Scope:Global
inet6 addr: 2001:250:1001:2176:76e5:43ff:fee7:622d/64 Scope:Global
inet6 addr: fe80::76e5:43ff:fee7:622d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:928416 errors:0 dropped:0 overruns:0 frame:0
TX packets:826549 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1233833659 (1.2 GB) TX bytes:101276285 (101.2 MB)

有teredo在说明安装还是成功的。我看的几乎所有的教程都说这时已经可以ping6通ipv6.google.com了，但是我却成功不了。ipv6测试如图所示。
ufw的配置是ipv6选择了yes，
cat /proc/sys/net/ipv6/conf/all/disable_ipv6
输出0,说明ipv6是开启的。
试过重启网络
invoke-rc.d networking restart
但还是不行。
各位大神有什么办法吗？本人是教育网，应该是可以用ipv6的啊。

[zhangzimou]

没有大神来帮忙吗？？