Re: 6rd - Rapid Deployment on existing IPv4 infrastructures - a new approach

[Rémi Després <remi.despres@free.fr>]

Anand Kumria wrote :
> Hi Rémi,
>
> On 2/12/08, Rémi Després <remi.despres@free.fr> wrote:
> > The I-D is available at:
> > http://www.ietf.org/internet-d​rafts/draft-despres-v6ops-6rd-i​pv6-rapid-deployment-00.txt
>
> Perhaps I am being very dense but how does this work, considering:
>
> - you (free.fr) have a /32 from RIPE-NCC
> - you have a IPv4 address (for the CPE) encoded in 32 bits
>
> The network portion of your 64 bits is now gone.
Yes.
Until Free a shorter prefix than /32 frpm the RIPE, their customer sites 
have only one IPv6 link (but this is sufficient to most).
Now that Free has received a shorter prefix they can change their 6rd 
ISP prefix and will be able to permit multiple subnets in their customer 
sites.

> You've lost the ability to specify your IPv6 6rd prefix?
>
> I realise that you've set aside a portion your the address space
> contained with the (i.e. RIPE-NCC+110/36) to be what you use for
> "Pure" IPv6 so, what do you specify to your CPEs as the 6rd ISP
> prefix? The whole /32 allocation?

The 6rd ISP prefix is the /32 itself.
Since none of the v4 addresses they assign starts with 1110 there is no 
confusion.

Rémi