Mod Edit: Split from http://www.bleepingcomputer.com/forums/t/364732/teredo-tunneling-do-i-need-it/ , moved to Win 10 Support - Hamluis.
I know this is an old post but had to mention this. By the way, I am using Windows 10.
Definetely disable the Teredo tunnel. I was watching my network traffic recently and discovered traffic on this interface that went right to a MS Redmond IP address. There was no reason for MS to be sending packets to themseleves from my network except for unwanted reasons. I think it is a gateway tunnel to gather info on us.
Edited by hamluis, 21 October 2015 - 05:26 PM.