<Tr> <Td> Decoded </Td> <Td> </Td> <Td> 65.54. 227.120 </Td> <Td> cone NAT </Td> <Td> 40000 </Td> <Td> 192.0. 2.45 </Td> </Tr> <Dl> <Dd> For a list of existing Teredo servers, see the list in External links . </Dd> </Dl> <Dd> For a list of existing Teredo servers, see the list in External links . </Dd> <P> Teredo clients use Teredo servers to autodetect the kind of NAT they are behind (if any), through a simplified STUN - like qualification procedure . Teredo clients also maintain a binding on their NAT toward their Teredo server by sending a UDP packet at regular intervals . That ensures that the server can always contact any of its clients--which is required for NAT hole punching to work properly . </P>

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