SIMCOM7600 Limiting external connection

[Aleksander Morgado]

Bon dia Aaron,


> I have an issue when I want to connect to an embedded device with SSH
> through VPN. It's strange because, depending on the type of SIM (M2M or
> conventional SIM), the module (SIMCOM 7500 or 7600) and the driver (qmi or
> the one from simcom) it works or not.
>
>
When you refer to the driver from simcom, is that a qmi_wwan driver
variant? Or a GobiNet driver variant?



> The cases are:
>
>    - Using a M2M SIM and either qmicli/simcom drivers:
>       - Both modules (7500E and 7600G-H) work properly (embedded has
>       Internet connection, and I can connect to it through SSH using the VPN.
>       - With this SIM, the wwan0 interface has an IP 10.128.X.X.
>    - Using a "conventional" SIM:
>    - With the simcom driver, both modules work well (Internet + VPN).
>       - With the qmicli, 7500E works well, but the 7600G-H only has
>       Internet connection (VPN doesn't work).
>       - With this SIM, the wwan0 interface has an IP 172.19.X.X.
>
>
>
You get the same kind of IP address both when using the simcom driver (with
AT commands) and the upstream one (with qmicli), right?



> When using qmicli I execute the following lines (using qmicli 1.16.2):
>
>    1. qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode='online'
>    2. ip link set wwan0 down
>    3. echo 'Y' | tee /sys/class/net/wwan0/qmi/raw_ip
>    4. ip link set wwan0 up
>    5. qmicli -p -d /dev/cdc-wdm0
>    --device-open-net='net-raw-ip|net-no-qos-header' --wds-start-network="apn='PROVIDER',ip-type=4" --client-no-release-cid
>    6. udhcpc -i wwan0
>    7. ifmetric wwan0 500
>
> When using simcom driver, I use raw AT commands + dhclient.
>
> To sum up, it only fails the external SSH connection when using
> "conventional" SIM + 7600 + qmicli, so I guess it has to do with their
> configuration or something related.
>
>
It's a bit strange, not sure what to say. Could it be something related to
using raw-ip in the 7600? I think 802.3 is not supported when using QMI in
such a new module. Have you tried contacting simcom support and explaining
the problem? Not sure what kind of support they give for
qmi_wwan/libqmi/qmicli though...

-- 
Aleksander
https://aleksander.es
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