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I have a rpi3b+ running latest os as headless with everything up to date and I use systemd-networkd for networking on it. I'm trying to connect a LTE usb modem to it for wan access. For that I use mbim-utils. Upon starting network with mbim at wwan0 with

#mbim-network /dev/cdc-wdm0 start
#mbimcli -d /dev/cdc-wdm0 -p --query-ip-configuration                         (1)

its gives the ip address and gateway like

IP: x.x.x.x/y
Gateway: x.x.x.z                                                              (2)

Normally I'd manually up the interface and configure the IP and gateway to enable wan access as follows.

#ip link set dev wwan0 up
#ip addr add x.x.x.x/y dev wwan0
#ip addr route default via x.x.x.z dev wwan0                                  (3)

This works on my linux machine and the rpi as well. But I want to configure it with systemd-networkd. So tried by connecting the modem to its registered network with commands in block (1) and created a new network file at /etc/systemd/network/wwan0.network and put in the assigned static IP

[Match]
Name=wwan0
[Network]
Address=x.x.x.x/y
Gateway=x.x.x.z
IPForward=yes                                                                 (4)

and then restarted the systemd-networkd.service, but this didn't work as I couldn't ping any wan IPs. How to get wan access by configuring it with systemd-networkd?

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2
  • What do ip link and ip addr say?
    – goldilocks ♦
    Nov 30, 2020 at 18:36
  • Please boot with the wwan0.network file and then add the output of the commands what goldilocks suggested and also from systemctl status systemd-networkd.service.
    – Ingo
    Dec 1, 2020 at 18:24

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