Teredo without a firewall?

[horrormaster]

I read the Teredo wiki page and it's all pretty much over my head.

Do you need Teredo if you aren't behind a firewall? If I start uTorrent with Windows Firewall enabled, it tells me that "IPv6 is Installed" and "Got Teredo Address:". If I start uTorrent with Windows Firewall disabled, it only tells me that "IPv6 is Installed".

[sveterv]

If you have a public IP address (you are not behind NAT), your system with firewall turned off use other mechanism for getting IPv6 connectivity like 6to4 and not Teredo. Both of them do the same thing but in a little other manner, so if in logging tab you see only "IPv6 is Installed" it means your system have IPv6 connectivity but not thanks to Teredo service. In short words, everything is OK, Teredo is only one way of getting you connected with IPv6 world.