Most of the time my ipv6 does not work! He makes a request to DNS, but can not connect, showing "Load Fail"and not "Server Not Found" as happens when IPv6 is not installed. I think that in IPv6/IPv4 sites, the browser prefers IPv6 and only then when the browser can not connect to the IPv6 it connects to IPv4 and that makes a slow connection. My operating system is Windows 7 SP1 x86 Original Updated I installed IPv6 tunnel from the instructions on the site Bit a Bit My connection is about NAT. My antivirus is Norton Internet Security 18.6.0.29 Windows Firewall is being managed by antivirus (is off) Ping does not respond to ipv6.google.com (Timed out) When I installed the tunnel (about 2 months ago) it always worked, but in recent weeks it usually works at night.