Teredo tunneling

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In computer networking, Teredo is a tunneling protocol used to give IPv6 connectivity to a computer with only an IPv4 connection. The IPv6 address block 2001:0::/32 is used with Teredo. Unlike similar protocols such as Protocol 41, Teredo works correctly only if the IPv4 network has a network address translator (NAT).[1] Teredo is available on Windows XP and later, and is enabled by default on Windows Vista and later. It is also available on Linux and Unix, with a program called Miredo. Teredo was named after "Teredo navalis", commonly called a shipworm, which creates holes or tunnels in wooden ships.

A Teredo address might look like: 2001:0:4136:e378:8000:63bf:3fff:fdd2. This address has the Teredo server 65.54.227.120, the client IPv4 address 192.0.2.45, and the UDP port number 40000.

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