Linux system cannot use the data connection

[Filip Kubicz]

Hi Amol, thanks for the answer. I checked that the devices are not hitting
the SIM data limit.
Moreover, as I mentioned there is some small RX/TX occurring for the device
from the operator point of view, but the "ping 8.8.8.8 -I wwan0" does not
work.

Filip


On Fri, Jul 15, 2022 at 1:28 PM Amol Lad <Amol.Lad at 4rf.com> wrote:

> I generally run into similar situation when my SIM card runs out of money.
> Do you want to try topping-up SIM card and see if ping is successful?
>
>
>
> Amol
>
>
>
> *From:* ModemManager-devel <
> modemmanager-devel-bounces at lists.freedesktop.org> *On Behalf Of *Filip
> Kubicz
> *Sent:* Friday, 15 July 2022 4:14 PM
> *To:* modemmanager-devel at lists.freedesktop.org
> *Cc:* Kamil Sroka <kamil.sroka at tier.app>
> *Subject:* Linux system cannot use the data connection
>
>
>
> Hi!
>
> I'm using ModemManager 1.18.6 with Quectel EG21-G modem and Twilio
> SuperSIM.
>
>
> This setup works ok on multiple devices.
> However, on a few devices, I see following situation:
>
> · Modem registered to operator network (e.g. Vodafone UK)
>
> · Modem reports connected state
>
> · wwan0 interface has IPv4 address
>
> · Network provider sees no issues
>
> · in Network provider console you can see the device exchanges a few
> hundred kB of data every hour
>
> · but ping doesn’t work
>
> · sending data fails
>
> This looks strange, as if ModemManager was not aware of the data session
> that is setup, or Linux system not being able to use it.
>
> The simplified flow of using the modem:
> - enable modem
> - wait until it auto-registers
> - create a bearer and connect
> - when bearer obtains IP address, configure the network interface
>
> I attached relevant mmcli information from the device (modem, bearer) and
> debug level logs from 2 situations:
> - device stable in connected state (but ping fails)
> - modem reset - sequence of enable, register, connect -> goes into the
> same state where ping does not work.
> I also attached the commands that are used for setting up the network
> interface when a new IP address is obtained.
>
> What should I check, or do you know how to avoid this situation?
>
>
> Kind regards,
> Filip
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