On Fri, Jan 3, 2020 at 2:17 PM William Herrin <b...@herrin.us> wrote:
> On Fri, Jan 3, 2020 at 2:11 PM Ca By <cb.li...@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 > b...@herrin.us > https://bill.herrin.us/ >
