> I'm not seeing this.
>
> vXuser ----- routers ------ vXserver
>
> v6user -----  NAT64 ------ v4server
>
> In the first case, the addresses are visible everywhere. In the second
> case, the destination address (in one form or another) is visible
> everywhere. How is this suddenly a privacy issue?

Compare

        V4user ---- NAT44 ---- v4server
And
      V4user ---- NAT64 ---- v6server

If you embed the internal V4 address in the translated address, the v6 servers 
will see it, while the v4 servers don't.

-- Christian Huitema



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