#1, Oh my yes, a very long time ago.
I think you mean, Steve Gibson over at, http://www.grc.com/intro.htm
UPnP and UPnP-x [of which Teredo technologies make wide use of, as well as MS's "Rally" technologies], are quite safe and advised.
Perhaps the best use of it is in Windows Home Server's set up - where everything is automated - router setup, DMZ, TSO/DNS, etc... It's pretty cool to watch.
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