Access to the IPv4 net for IPv6-only systems, was: Re: WG Action: Conclusion of IP Version 6 (ipv6)

Alain Durand alain_durand at
Fri Sep 28 21:38:42 UTC 2007

On 10/21/07 5:13 PM, "Iljitsch van Beijnum" <iljitsch at> wrote:

> I think an approach where you have a regular IPv4 NAT and then tunnel
> the RFC 1918 addresses over an IPv6-only network would work better
> than NAT-PT.

The issue here is that the translation would have to occur at the box that
is decapsulating the packet, as the mapping private-v4 to v4 would have to
be indexed by some kind of tunnel ID that identifies the customer.

If you translate v4 to v6 at the home gateway, you have a global v6 address
to identify that customer and you can do the reverse translation (back to
v4) pretty much anywhere you want in the service provider network.

   - Alain. 

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