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I have a computer with Windows 7. It's connected to Internet via an IPv4 NAT router. How can I access a host that is only accessible with IPv6?

Is there an easy way to configure the Windows 7 Teredo tunnel for this? or how to solve this?

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up vote 0 down vote accepted


  1. Get a native IPv6 connection (most recommended).


  2. Do tunneling.

    1. via SixXS, or any other tunnel broker (recommended)
    2. via 6to4 (might be unstable and thus not recommended). Here, your IPv6 is assembled of 2002:aabb:ccdd::, where aa, bb, cc and dd are the hex representations of the octets in your IPv4. Maybe this might help.
    3. via Teredo (don't know how that works)
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Teredo should work out of the box, but is disabled by default if the computer is a member of a Windows domain.

The IPv6 only host must reply to pings, and the teredo relay is chosen by IPv6 routing from the IPv6-only host.

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It would be helpful if you could explain how to activate Teredo in your answer. – Jonas Nov 19 '11 at 16:11

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