ipv6 teredo tunnel

I am still confused about the the teredo tunnel. It says that it is an automatic tunnel. But where is the tunnel built? Is it from the host to the teredo server or teredo relay? How does it do it automatically?
Also, why can it work with a NAT device?

Thanks
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leblancAccountingAsked:
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JohnBusiness Consultant (Owner)Commented:
Here is a decent article in Wikipedia about Teredo tunneling that seem fairly decent.

http://en.wikipedia.org/wiki/Teredo_tunneling

If you are not using IPv6 (I am not) then it is not used so far as I know. I have a VPN home office router and IPv6 is disabled. There are only a half dozen devices on the network, so no need for IPv6.

Happy reading.   ... Thinkpads_User
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JohnBusiness Consultant (Owner)Commented:
I simply ignore it. I have NCP Secure Entry which builds an IPv4 tunnel to clients. I think Shrew Soft does the same as well.

So the IPv6 tunnel sitting in the Network is not used. It does not connect to anything.

.... Thinkpads_User
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leblancAccountingAuthor Commented:
What I meant to say was I read a white paper on teredo and I'd like to understand more about the technology.
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JohnBusiness Consultant (Owner)Commented:
@pitachip - Thanks and I was happy to help.

.... Thinkpads_User
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