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According to this article
http://www.consulintel.euro6ix.org/ietf/draft-palet-v6ops-6in4-vs-6over4-01.html
6in4 is only encapsulation mechanism that is used by transition mechanisms like 6over4.
What kind of tunnel is
ip tunnel mode sit ?

I found on many sites that it is 6in4 or 6over4. 6in4 is incorrect according to this article. 6over4 uses only multicast addresses but this command allows use other ip addresses.

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Tunnel mode "site" is a 6in4 connection. This is how I would describe them

6in4 - a manually configured IPv6 tunnel that operated over IPv4.

6to4 - an automatically configured tunnel (uses 6in4 underneath with a bit of control magic)

Teredo - an automatically configured tunnel (uses UDP underneath)

6over4 - an automatically configured tunnel (uses IPv4 Multicasting, not widely supported).

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