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[edoardocolombo99]

Again, check your MTU value, it could be less than 1492

i run the test: https://gyazo.com/d929dac7e8414ff9688596ed57b09cd1

[edoardocolombo99]

Again, check your MTU value, it could be less than 1492

Now its 1492 https://gyazo.com/0faaf22036d87400f6b34b2365c9f964
But i cant visit any ipv6 site https://gyazo.com/e41a6f1254f24329a832db420f3e842b


No ipv6 for me :O

[xiecong520]

netsh interface ipv6 add dnsservers "Wi-Fi" 2001:470:20::2 index=1

Try the above command, such as not not. Please try the following command

netsh interface isatap set state disabled
netsh interface 6to4 set state disabled
netsh interface teredo set state disabled
netsh interface ipv6 delete interface "IP6Tunnel*"
route -f
netsh interface ipv6 reset

After input the above command, restart the computer.

netsh interface ipv6 add v6v4tunnel interface=IP6Tunnel localaddress=192.168.1.3 remoteaddress=216.66.80.98
netsh interface ipv6 add address interface=IP6Tunnel address=2001:470:25:64d::2
netsh interface ipv6 add route prefix=::/0 interface=IP6Tunnel nexthop=2001:470:25:64d::1


Once again, restart the computer.  OK

[edoardocolombo99]

Thanks for the reply, but still not working

https://gyazo.com/33c7c0921497d62000de3427d806f447

[xiecong520]

ipconfig /flushdns
netsh int ipv6 delete neighbors
netsh int ipv6 delete destinationcache
netsh int ipv4 delete neighbors
netsh int ipv4 delete destinationcache
netsh int ipv6 reset
netsh int ipv4 reset
netsh winsock reset

restart the computer

ipconfig /registerdns
netsh interface ipv6 add v6v4tunnel interface=IP6Tunnel localaddress=192.168.1.3 remoteaddress=216.66.80.98
netsh interface ipv6 add address interface=IP6Tunnel address=2001:470:25:64d::2
netsh interface ipv6 add route prefix=::/0 interface=IP6Tunnel nexthop=2001:470:25:64d::1
netsh interface ipv6 add dnsservers "Wi-Fi" 2001:4860:4860::8888  index=1
netsh interface ipv6 delete route ::/0 ""Wi-Fi"" fe80::1

If you can't. 
  ping 216.66.80.98   or    tracert -d 216.66.80.98
  ping -6 2001:470:25:64d::1    or   tracert -d 2001:470:25:64d::1
  [ing -6 2001:4860:4860::8888    or    tracert -d 2001:4860:4860::8888
Look at the problem in where