As Med replied in a different email, the CPE is the B4 in the ds-lite draft
which performs v4-over-v6 tunnel for v4 packets. No NAT-44 will happen in
B4.


On 3/22/10 10:28 AM, "孙琼" <[email protected]> wrote:

> Hi Boucadair, 
>  
> I'm wondering if I have missed something in this draft. I can understand that
> in this extended DS-Lite, ICXF is core stateless and it is quite scalable for
> core routers. However,  since CPEs can send both IPv4 packet and IPv6 packet
> to AFTR, it will then include double NAT problem if we have to allocate
> private IPv4 address to CPEs. Then what is the advantage of this kind of
> DS-Lite vs. NAT666 plus dual stack?
>  
> Thank you very much.
>  
> Best regards
>  
> Qiong SUN
> 
> 
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