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ipv6 6to4 and 6in4

I am a bit confused between 6to4 and 6in4. From my understanding 6in4 is encapsulated IPv6 inside IPv4 header. That can be done manually from the routers. A few questions:
- Is 6to4 and 6in4 the same thing?
- For the tunnel broker, like he.net for example, is it 6in4 or 6to4? The tunnel broker is considered as IPv6 automatic transition technique.
- what is the RFC for 6to4? I know that 6in4 is 4213.

Thanks

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giltjr

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leblanc

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So it looks like they both encapsulate ipv6 in ipv4 header and they both require the tunnel configuration on the routers. Except for 6in4, you have "tunnel mode ipv6ip" and "tunnel mode ipv6ip 6to4" for 6to4. Here is my confusion. it says that 6in4 is a manual process and 6to4 is an automatic process. I don't see it as you have to manually configure your network devices with both techniques.

Also, why 6to4 is disabled by default in Windows 7?

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giltjr

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leblanc

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leblanc

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do not need to specify the tunnel destination address is the main difference between 6in4 and 6to4