3. Share Cellular Connection via Ethernet

This guide explains how to share a cellular connection via Ethernet on the Edge IoT Gateway S.

3.1. Configure NetworkManager Firewall Backend

Configure NetworkManager to use iptables as the firewall backend:

sudo install -d /etc/NetworkManager/conf.d
sudo tee /etc/NetworkManager/conf.d/99-firewall-backend.conf > /dev/null <<'EOF'
[main]
firewall-backend=iptables
EOF

3.2. Reboot the Gateway

Reboot the Gateway to apply the changes:

sudo reboot

3.3. Configure Cellular and Ethernet Connections

Important

If you are connected to the Gateway over Ethernet, run all four commands below together. Enabling the shared Ethernet connection may interrupt your current connection to the Gateway.

Run the following commands:

sudo nmcli connection add type gsm ifname cdc-wdm0 con-name cellular apn internet
sudo nmcli connection up cellular
sudo nmcli connection add type ethernet ifname end0 con-name shared ipv4.method shared ipv4.addresses 10.42.0.1/24
sudo nmcli connection up shared

3.4. Verify the Configuration

Check active NetworkManager connections:

nmcli connection show --active

Both the cellular and Ethernet connections should be active.

Check the IP address assigned to the Ethernet interface:

ip addr show end0

The interface should use the following address:

10.42.0.1/24

Connect another device to the Gateway using an Ethernet cable. The connected device should automatically receive an IP address from the 10.42.0.0/24 network and use the Gateway’s cellular connection to access the Internet.