From: Sami (sy1977@gmail.com)
Date: Fri Jun 16 2006 - 18:04:28 ART
Roberto,
I was just about to ask same question. IE LAB 9 task 7.2 IPV6 tunnel , today
I did this lab and I was scratching my head for hours to understand how
this tunnel works without any tunnel destination and you know there is no
solution explained for that in solution guide.
Is Brians or Petr listening ? Guys please explain the solution how this
tunnel works
Thx.
- Sami
On 6/16/06, Roberto Fernandez <rofernandez@us.telefonica.com> wrote:
>
> Friends,
>
> I've been going over the IPv6 and there is a kind of tunnel, which I
> still do not completely understand how it works, the 6to4.
>
> This kind of tunnel does not need the static configuration of the remote
> end-point. The router is supposed to be able to figure out the remote
> IPv4 endpoint of the tunnel from the destination IPv6 address. For the
> tunnels itself one special address space has to be used 2002::/16 to
> construct the tunnel's address by embedding the IPv4 address of the
> source Interface.
>
> So let put it into numbers
>
> R-1, Loopback0, 150.1.1.1
>
> Interface Tunnel0
> tunnel source loopback0
> tunnel mode ipv6ip ipv6to4
> ipv6 address 2002:9601:101::1/64
> !
> ipv6 route 2002::/16 tunnel0
>
> R-2, Loopack0, 150.1.2.2
>
> Interface Tunnel0
> tunnel source loopback0
> tunnel mode ipv6ip ipv6to4
> ipv6 address 2002:9601:202::2/64
> !
> ipv6 route 2002::/16 tunnel0
>
> Here is the question how does the routers discover to which endpoint do
> they need to send the IPv4 packet?
>
> From the above configuration I see it would only work for hosts with
> IPv6 addresses on the 2002::/16 and only if every host's IPv6 address
> would be constructed based on the underlying IPv4 network.
>
> Please if some one has a good explanation, on how this works and how
> could be those tunnels used to connect to public IPv6 networks it would
> be greatly appreciated.
>
> Best Regards,
> Roberto
>
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