On 10/3/19 8:42 AM, Fred Baker wrote:

On Oct 3, 2019, at 9:51 AM, Stephen Satchell <list@satchell.net> wrote:

Someone else mentioned that "IPv6 has been around for 25 years, and why

is it taking so long for everyone to adopt it?"  I present as evidence

the lack of a formally-released requirements RFC for IPv6.  It suggests

that the "science" of IPv6 is not "settled" yet.  That puts the

deployment of IPv6 in the category of "experiment" and not "production".

And, of course, we now have companies like T-Mobile and others

turning IPv4 off. If that's an experiment, wow.

The cellular data industry appears to have embraced IPv6 in one form or
another.  I would expect that the network engineers have done some work
to keep IPv4 off their *internal* networks, but provide IPv4 access at
the edge.  (Isn't a netblock within IPv6 intended to enable bridging to
IPv4?)  The applications on the phon could be configured to search DNS
for AAAA addresses first.