iOS9 launch and T-Mobile DE IPv6

[Mikael Abrahamsson]

On Wed, 9 Sep 2015, Jens Link wrote:

> On some devices even tethering is working with IPv6. (I tried MOTO G2 
> and Nexus 10).

Dual stack tethering worked also on iOS 8.3 on Tele2 network in Sweden 
(March 2015). So this is not a iOS9 feature.

Tethering for IPv6 only mobile networks on iOS, that's a different story. 
iOS does not have a 464xlat function at this time, which would be required 
to give dual stack access over IPv6+NAT64 access. I imagine it will gain 
this feature at some point in time.

With the current approach they only need it for the tethering case, 
because for applications running on the device itself, they can do 
bump-in-the-API (which they do). I have pitched this idea to Apple 
employees who are in a good position to do something about it, we'll see 
what approach they choose. As usual, Apple has a strict policy about not 
talking externally about anything until it's actually released, but it's 
at least encouraging that they're now talking externally about how things 
work, after it's actually released. For instance they've publically 
explained how their happy eyeballs implementation works in iOS9 and 
OSX10.11 (25ms head start for IPv6 which is great news).

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se