Re: ANN: NetworkManager 1.0.0 released!

[Aleksander Morgado <aleksander aleksander es>]

On Tue, Dec 23, 2014 at 12:43 PM, Bjørn Mork <bjorn mork no> wrote:
> > > > So you need the full context type choice for QMI as well.  The odd
> > > > two-step dual-stack connection does not change this.  The PDP type is
> > > > always selected by the first connection.
> > >
> > > Is that true even if we use different separate WDS clients? If either
> > > IPv4v6 and IPv4+IPv6 are selected for a QMI modem, MM's logic will
> > > create separate WDS clients, each of them with a different "Set IP
> > > Family Preference" set before calling "Start Network". Are we
> > > achieving something correct with this logic? Or not? And if not, how
> > > are we supposed to request IPv4v6 using only QMI? (i.e. not with the
> > > default profile being configured via AT commands).
> >
> > I verified a while back that this is what Verizon's connection manager
> > did on Windows with the UML290 to achieve a working dual-stack
> > connection.  And yes, all 3 PDP contexts in the modem were "IPV4V6".
> > AFAIK there is no way to get a dual-stack connection without starting
> > two WDS clients and setting the IP Family Preference.
>
> Yes.  But note that the shared "IPV4V6" bearer is created by the *first*
> WDS client issuing "start network".  The second WDS client is simply a
> QMI management oddity.  It does not create or modify the bearer in any
> way.  How could it?
>
> Depending on your profile config, the results of two successive WDS
> start network commands will be:
>
> profile PDP type = IPV4V6
>  ipfamily=4; WDS client A start network => success, IPV4V6 bearer created
>  ipfamily=6; WDS client B start network => success
>
> profile PDP type = IPV4
>  ipfamily=4; WDS client A start network => success, IPV4 bearer created
>  ipfamily=6; WDS client B start network => failure
>
> profile PDP type = IPV6
>  ipfamily=4; WDS client A start network => failure
>  ipfamily=6; WDS client B start network => success, IPV6 bearer created

That's much clearer now, thanks!

> The only way you can select the bearer PDP type is by modifying the
> profile (either default or referenced from the profile TLV).  If you
> don't control the profile, then the result is arbitrarily defined by the
> existing default.

We really need to look for a way to define IPV4V6 profiles with QMI
then, there has to be some way to do that. And we should switch the
implementation to activate already predefined profiles, instead of
what we currently do with the StartNetwork passing APN explicitly.

-- 
Aleksander
https://aleksander.es