On Fri, Jan 3, 2020 at 2:11 PM Ca By <cb.list6@gmail.com> wrote:
> You are not using ipv4 today.
>
> The scenario you describe, using facetime (iOS) on T-Mobile US, you are not using ipv4 on the device. T-Mobile does not assign ipv4 addresses to iOS or Android devices in default scenarios, has not for years.
>
> If the far end of your facetime call is v4-only, you may need nat64 in the cloud.... but otherwise no v4 in the flow, and no v4 on the device.
AFAIK, that's not correct. T-Mobile does provide IPv4 *on the device*
but translates it to IPv6 (464xlat) before the packets leave the
device for the network.
Regards,
Bill Herrin
Eh. True. Semantics, to a degree.
T-Mobile does not assign an ipv4 address to the handset. That said, T-Mobile assigns a v6 to the handset, the handset then does 464xlat as you said, assigning itself a special v4 address to v4->v6 nat on handset.
And, Bob is your uncle, as they say.
--
William Herrin
bill@herrin.us
https://bill.herrin.us/