Re: HUWAEI E1750 NDISDUP

[Dan Williams <dcbw redhat com>]

On Wed, 2013-12-18 at 18:38 +0100, poma wrote:
> On 18.12.2013 00:26, Dan Williams wrote:
> > On Tue, 2013-12-17 at 23:50 +0100, poma wrote:
> > > HUWAEI E1750 NDISDUP
> >
> > Is the difference between the two modes just the usb_modeswitch
> > commands?  I see they have different USB IDs between first and second
> > runs.
>
> USB Modeswitch has nothing to do with it, besides it doesn't work. ;)
> Actually the device switches mode by itself. ;) 'pid 140c' is inherited
> through a warm state(reboot) from proprietary OS. However if the device
> is replugged(cold state) within the Linux kernel, it switches to the
> 'pid 1436' mode.
> And vice versa.

That's still usb_modeswitch.  Windows is sending a specific message to
the Huawei device telling to use a specific mode, and it switches to
that mode.  After reboot to Linux, it's still in that mode.  But if you
coldplug the device while in Linux, usb_modeswitch sends a message to
the device that is different than what Windows sends.

On Linux with ModemManager, we would prefer to use the "Windows" mode
since that is more capable.  Unfortunately, usb_modeswitch needs changes
to send the correct message to switch to the "Windows" mode too.

All that said, if possible ModemManager should try to support the
non-Windows cdc-ether mode too, but there may be bugs with that.

Dan

> > In any case, if ModemManager can handle the device, we would expect
> > NetworkManager to handle it as well.  In general, we'd prefer to handle
> > the device with QMI and the QMI network commands instead of NDISDUP,
> > unless the device doesn't implement the QMI stack very well.
> >
> > In both cases, however, ModemManager should be doing the right thing
> > wtih either QMI or NDISDUP, then advertise that the IP configuration
> > method should be "DHCP", and NetworkManager will perform DHCP on the
> > interface and set up the IP configuration.
>
> Super duper!
> Thanks for your response.
>
>
> poma
>
>
>
>
>
>
> _______________________________________________
> networkmanager-list mailing list
> networkmanager-list gnome org
> https://mail.gnome.org/mailman/listinfo/networkmanager-list