If not, you should check the antivirus software first. Because I have encountered problems with anti-virus software.
Well, in addition, you can first command this netsh interface IPv6 isatap to set the router 172+08.0.249 at the prompt.
I'm not a student of Wuhan University, just helping my friend watch V6 pass by.
/whuhome/ipv6.htm
My classmate is in the engineering department. IPV6 has been installed, but it seems that your school's IPV6 is very poor and the network speed is very slow.