Hi,

The concept of 6to4 tunneling is to do encapsulate and descapsulate an ipv6 packet through ipv4 network. The encapsulation process is:

[IPv6 header][Transport Header][Application Protocol data]

=> encapsulation:

[Ip4 Header][IPv6 header][Transport Header][Application Protocol data]

I am talking from this infrastructure:

Host A (IPv6) -> Router R1 (dual stack) -> Ipv4 net work -> Router R2 (dual stack) -> Host B (Ipv6) packet.

The Ipv4 header in the encapsulation, which Ipv4 header is this among: Host A, Router R1, Router R2 and Host B?

Thanks in advance.