Re: [v6ops] I-D Action: draft-ietf-v6ops-ipv6-roaming-analysis-02.txt

[Ross Chandler <[e-mail]>]

On 6 Aug 2014, at 19:34, Tore Anderson <[e-mail]> wrote:

> Yes, I think I've understood this part. My point is that since Telenor's
> APN does not support the IPv4 PDP type, then it won't work to use IPv4
> as the Roaming PDP type, as was suggested earlier in the thread. (Nor as
> the Home PDP type, for that matter.) So the only sensible setting in
> this case would be to use PDP type IPv6 for both the Roaming and Home
> PDP type settings.
> 
> If on the other hand the APN supports both IPv4 and IPv6 (like
> Tele2/NwN's does), then that is a different story, and having the UE use
> IPv4 when roaming makes sense (if the roaming partners break IPv6 for
> some reason).
> 
> At least that’s how I understand it...

It might be that when the UE visits a network that doesn’t allow IPv6 in the user-plane Android behaviour is kicking in.

I’ve been told that Android treats all APNs as “roughly equal”. 

If the new IPv6-only-without-IPv4-fallback APN fails then Android might be trying the IPv4 one.

BR
Ross