Re: nm in different linux distributions - ppp versus qmi-wwan

[Dan Williams <dcbw redhat com>]

On Thu, 2015-11-05 at 19:15 +0100, Thomas Schäfer wrote:
> Hi,
>
> the last days I tested the NetorkManager with the Huwei E398 with dualstack on 
> livecd / fresh installed systems. (ISP Deutsche Telekom(t-mobile))
>
> I observed the 
>
> Opensuse 42.1
> nm1.0.6/mm1.4.10 --> uses qmi-wwan, connection editor allows to enable IPv6
> and it works
>
> Ubuntu 15.10
> nm1.0.4/mm1.4.10 --> uses qmi-wwan, connection editor ignores IPv6 completely 
> after changing manually  the method to auto it works
>
> manjaro-xfce-15.09-x86_64
> manjaro-kde-15.09-x86_64
>
> nm1.06/mm?? --> uses ppp, connection editor allows to enable IPv6
> but IPv6 via ppp is not supported by the modem
>
> So my question is: Who does decide between qmi-wwan or ppp?

ModemManager does, based on device discovery.  So it's likely that the
version of ModemManager that you typed as "mm??" isn't able to correctly
recognize the modem as a QMI one.  That is either a ModemManager
problem, a kernel driver problem, or a "modeswitch" problem (where the
device is not told to come up in the right mode by usb_modeswitch, if
the modem requires that).

If you can add "--debug" to the ModemManager service arguments (through
either systemd, dbus autostart, or whatever runs MM on your system) them
we could get more info.

Dan