I’m having some strange problems with Windows 7 creating tunneling interfaces for IPv6 over IPv4 (visible via “ipconfig /all”). Now that DNS servers are returning AAAA (ipv6) DNS records, it seems that Windows 7 is trying to use IPv6 over IPv4 is some special cases.
Until IPv6 is implemented on the local network, this may not be a good thing. In my case, it is causing some sites to not work properly for me.
The “netsh interface” commands listed at http://sourcedaddy.com/windows-7/enabling-or-disabling-ipv6.html were helpful to me. I also was able to clear out some weird tunnel related settings by disabling and re-enabling my adapter.
This is still in the “strange … may be caused by aliens” category for me. I’ll revisit the topic if I learn more.