Linux system cannot use the data connection

[Amol Lad]

Please try below (skip dns resolution)

wget http://193.63.62.31/sites/default/files/publications/civic_renewal_forms.zip

From: Filip Kubicz <filip.kubicz at tier.app>
Sent: Friday, 15 July 2022 6:29 PM
To: Amol Lad <Amol.Lad at 4rf.com>
Cc: modemmanager-devel at lists.freedesktop.org; Kamil Sroka <kamil.sroka at tier.app>
Subject: Re: Linux system cannot use the data connection

Hi Amol,

# wget http://speedtest.ftp.otenet.gr/files/test10Mb.db
--1970-01-04 01:06:40--  http://speedtest.ftp.otenet.gr/files/test10Mb.db
Resolving speedtest.ftp.otenet.gr... failed: Temporary failure in name resolution.
wget: unable to resolve host address 'speedtest.ftp.otenet.gr<http://speedtest.ftp.otenet.gr>'

Filip


On Fri, Jul 15, 2022 at 2:52 PM Amol Lad <Amol.Lad at 4rf.com<mailto:Amol.Lad at 4rf.com>> wrote:
Please also try downloading a test file as below and see the result. Does it download any file at all?

wget http://speedtest.ftp.otenet.gr/files/test10Mb.db



From: Filip Kubicz <filip.kubicz at tier.app<mailto:filip.kubicz at tier.app>>
Sent: Friday, 15 July 2022 5:28 PM
To: Amol Lad <Amol.Lad at 4rf.com<mailto:Amol.Lad at 4rf.com>>
Cc: modemmanager-devel at lists.freedesktop.org<mailto:modemmanager-devel at lists.freedesktop.org>; Kamil Sroka <kamil.sroka at tier.app<mailto:kamil.sroka at tier.app>>
Subject: Re: Linux system cannot use the data connection

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<mailto: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<mailto: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<mailto:modemmanager-devel at lists.freedesktop.org>
Cc: Kamil Sroka <kamil.sroka at tier.app<mailto: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
________________________________
The information in this email communication (inclusive of attachments) is confidential to 4RF Limited and the intended recipient(s). If you are not the intended recipient(s), please note that any use, disclosure, distribution or copying of this information or any part thereof is strictly prohibited and that the author accepts no liability for the consequences of any action taken on the basis of the information provided. If you have received this email in error, please notify the sender immediately by return email and then delete all instances of this email from your system. 4RF Limited will not accept responsibility for any consequences associated with the use of this email (including, but not limited to, damages sustained as a result of any viruses and/or any action or lack of action taken in reliance on it).
-------------- next part --------------
Please try below (skip dns resolution)

wget http://193.63.62.31/sites/default/files/publications/civic_renewal_forms.zip

From: Filip Kubicz <filip.kubicz at tier.app>
Sent: Friday, 15 July 2022 6:29 PM
To: Amol Lad <Amol.Lad at 4rf.com>
Cc: modemmanager-devel at lists.freedesktop.org; Kamil Sroka <kamil.sroka at tier.app>
Subject: Re: Linux system cannot use the data connection

Hi Amol,

# wget http://speedtest.ftp.otenet.gr/files/test10Mb.db
--1970-01-04 01:06:40--  http://speedtest.ftp.otenet.gr/files/test10Mb.db
Resolving speedtest.ftp.otenet.gr... failed: Temporary failure in name resolution.
wget: unable to resolve host address 'speedtest.ftp.otenet.gr<http://speedtest.ftp.otenet.gr>'

Filip


On Fri, Jul 15, 2022 at 2:52 PM Amol Lad <Amol.Lad at 4rf.com<mailto:Amol.Lad at 4rf.com>> wrote:
Please also try downloading a test file as below and see the result. Does it download any file at all?

wget http://speedtest.ftp.otenet.gr/files/test10Mb.db



From: Filip Kubicz <filip.kubicz at tier.app<mailto:filip.kubicz at tier.app>>
Sent: Friday, 15 July 2022 5:28 PM
To: Amol Lad <Amol.Lad at 4rf.com<mailto:Amol.Lad at 4rf.com>>
Cc: modemmanager-devel at lists.freedesktop.org<mailto:modemmanager-devel at lists.freedesktop.org>; Kamil Sroka <kamil.sroka at tier.app<mailto:kamil.sroka at tier.app>>
Subject: Re: Linux system cannot use the data connection

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<mailto: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<mailto: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<mailto:modemmanager-devel at lists.freedesktop.org>
Cc: Kamil Sroka <kamil.sroka at tier.app<mailto: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
________________________________
The information in this email communication (inclusive of attachments) is confidential to 4RF Limited and the intended recipient(s). If you are not the intended recipient(s), please note that any use, disclosure, distribution or copying of this information or any part thereof is strictly prohibited and that the author accepts no liability for the consequences of any action taken on the basis of the information provided. If you have received this email in error, please notify the sender immediately by return email and then delete all instances of this email from your system. 4RF Limited will not accept responsibility for any consequences associated with the use of this email (including, but not limited to, damages sustained as a result of any viruses and/or any action or lack of action taken in reliance on it).