JoesyXHN's questions

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.

I understand about different Tunneling techniques (6to4, ISATAP and Teredo).

However, most of papers and books are absent of how to deploy these techniques. For example, if I have a dual-stack router (ipv4/6), how can I install/enable 6to4 or ISATAP or Teredo on that Router (linux) OS?

Thanks in advance.

Most of the articles I have read about Tunneling. It describes that the tunneling supports for communication between 2 IPv6 networks over (crossing) an Ipv4 network. For example:

     TUNNEL A (IPv6) ==> INTERNET NETWORK (IPv4) => TUNNEL B (IPv6)

Would it be doable for:

     TUNNEL A (IPv4) ==> INTERNET NETWORK (IPv6) => TUNNEL B (IPv4)

Please give me an answer with elaborate explanation.

Thanks in advance.

What is the difference between link-local address and global link address in ISATAP?

For example:

link-local address: fe80::5efe:c000:0201
global address: 3ffe:b00:1:2::5efe:c000:0201

Why don't we use just one address? Why it is helpful to use both?