Teredo is a transition technology that allows a computer or node located behind a IPv6-unaware network address translation (NAT) device to use IPv6 connectivity to communicate with other computers that use IPv6. Teredo tunneling technology defines a way of encapsulating IPv6 packets within IPv4 UDP datagrams that can be routed through NAT devices and on the IPv4 internet. IPv6 and Teredo is installed and enabled by default in Windows Vista, and users cannot uninstall them.
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