Microsoft Teredo Tunneling Adapter Device download

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Now you should see it if installed.

if you are using IPV6, Teredo should be disabled. Probably why it might not have been installed on upgrade.

In computer networking, Teredo is a transition technology that gives full IPv6 connectivity for IPv6-capable hosts that are on the IPv4 Internet but have no native connection to an IPv6 network. Unlike similar protocols, it can perform its function even from behind network address translation (NAT) devices such as home routers.

Teredo operates using a platform independent tunneling protocol that provides IPv6 (Internet Protocol version 6) connectivity by encapsulating IPv6 datagram packets within IPv4 User Datagram Protocol (UDP) packets. Teredo routes these datagrams on the IPv4 Internet and through NAT devices. Teredo nodes elsewhere on the IPv6 network (called Teredo relays) receive the packets, un-encapsulate them, and pass them on.

Teredo is a temporary measure. In the long term, all IPv6 hosts should use native IPv6 connectivity. Teredo should be disabled when native IPv6 connectivity becomes available. Christian Huitema developed Teredo at Microsoft, and the IETF standardized it as RFC 4380. The Teredo server listens on UDP port 3544.

I have no Teredo Tunneling Adapter.....

I have the same problem

the Microsoft Teredo Tunneling Adapter  was not in there

Computer says this adapter is not working but when I try to update it tells me that it is already on my computer.  At least I understood what the instructions were.  Thank you.