Re: ttyACM0, ttyUSB0, usb0 ???

[José Queiroz <zekkerj gmail com>]

Em 4 de fevereiro de 2010 20:35, Dan Williams <dcbw redhat com> escreveu:
> On Mon, 2010-02-01 at 10:11 -0200, José Queiroz wrote:
>> Hi,
>>
>> I used to use a 3g usb dongle (Sony MD300). The first time I plugged
>> it, it created a device called "ttyACM0", in a way that I could use
>> wvdial and use pppd to conect it.
>>
>> But after some updates on NetworkManager, it started to show up as
>> "usb0", and the pppd process was hidden in some way that wvdial could
>> no more work.
>
> The Sony Ericsson MD300/MD400, F3507g, and F3607gw don't normally use
> PPP.  Instead, they provide a ttyACM0 control channel and a cdc-ether
> usb0 network device.  The control channel is used to set up the
> connection, and then DHCP is used on the usb0 network device.
>
> Keep in mind that PPP is entirely pointless on 3G networks; the PPP is
> solely between your computer and the dongle, and it actually slows
> connections down to the point where you cannot achieve 3.6Mbps or
> 7.2Mbps HSDPA transfer rates.

Wow, this is interely new for me. "Fiat Lux". kkk.

>
>> Now I have another dongle (Onda MSA405HS), from another ISP, and when
>> I plug it, it shows up as "ttyUSB2". I can easily connect using
>> wvdial, but NetworkManager doesn't works.
>
> The ONDA/ZTE device does use PPP since it does not have the capability
> to bypass PPP and use a network device.
>
>> My questions:
>>
>> 1) Why did the MD300 changed from "ttyACM0" to "usb0"? Will this be a
>> rule, in all 3g connections?
>
> Not all cards support bypassing PPP.  Only Ericsson and Option cards
> support it at this time.
>
>> 2) Why didn't "ttyUSB2" turned into "usb0", also?
>
> Because the ZTE/ONDA device's firmware does not have the capability to
> bypass PPP.
>
>> 3) The MSA405HS have 2 other devices, "ttyUSB0" and "ttyUSB1". Why do
>> NM chooses to work with "ttyUSB2"?
>
> ModemManager automatically detects the modem ports that a device
> provides, but sometimes the device only handles PPP on one of its ports.
> Unfortunately we can't always automatically detect that, so ModemManager
> needs a little help.
>
> You may need to update your version of ModemManager to get a new version
> of the /lib/udev/rules.d/77-mm-zte-port-types.rules file.  If you don't
> see your device's USB IDs in that file, please tell me:
>
> 1) what the USB IDs of your device are
> 2) what port works for PPP (ie, what you can use with wvdial)
>
> and I'll update that file which will make ModemManager use the correct
> port.
>

Yes, they are there (0x19d2:0x0037). And, in fact, ttyUSB2 is the
right one to use, as is the same one I use with wvdial.

But, still, NM doesn't connects it.

>> 4) How can I configure NM to give me more information, said, activate
>> debug messages right from boot?
>
> Run it with --no-daemon.  Or just look in /var/log/messages
> or /var/log/daemon.log, depending on your distribution.
>

Kubuntu 9.10,
NM 0.8~rc2-0ubuntu2~nmt3~karmic,
KDE nm-applet 0.9~svn1040607-0ubuntu1~karmic1~ppa1.

I dream of being able to debug just 3G connections, without messing
with wireless. :)

So I could fix this 3G connection, without getting offline in the meantime.

----------------------

OFF-Topic:

Is it too hard to configure the list server, so our messages get
replied automaticaly back to <networkmanager-list gnome org> ??? I
lost the account of times I sent answers in pvt just because I forgot
to change the address of the reply...