Quoting Randy Carpenter <rcar...@network1.net>:
Safari is definitely preferring IPv4.
In a happier note, if you tether a device via hotspot on an IOS6 iPad, the
clients get native IPv6. Strangely, they get addresses out of the
same /64 as the iPad's LTE interface. Anyone know how that is
working? I would have thought they would use prefix-delegation, and
there would be a separate routed /64.
I assume they're doing the same thing I am. The cell network
interface is just a p2p interface, and the whole /64 is routed to the
phone/tablet. You can configure the p2p interface address as a /128
and configure the /64 on the wifi interface. My understanding of the
3gpp specs is that the cell provider won't have an address in that
/64, so you won't conflict with anything upstream of the phone/tablet.
Here's a screenshot of my (wifi-only) tablet getting v6 while tethered
through my phone:
http://dan.drown.org/android/clat/IMG_20120425_105124.jpg
