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we have Raspberry Pi CM4 with Ubuntu. On board ethernet adapter (eth0) is connected to internet and USB to ethernet adapter (eth1) connected a device with a static ip.

When we plug the eth1 internet connection goes away.

Here is our netplan yaml;

Network:
    Version: 2
    ethernets:
        eth0:
            dhcp4: true
        eth1:
            dhcp4: false
            addresses: [192.168.5.15/24]
            gateway4: 192.168.5.1

Thanks for helps.

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    The issue seem to be in routing. Have you checked the question below? raspberrypi.stackexchange.com/questions/93616/…
    – Vadim
    Sep 16, 2022 at 10:58
  • Thanks for the link. I couldn't try it yet but it seems useful. It was our Sophos firewall issue. It is probably scanning the network for unknown devices with a period. When we plug the cable for obtaining ip it can connect to the internet but after a period it closes the unknown device's connection. We shared our internet from phones. The problem was gone. And it was a prototype now we are working on other parts of the device. When we apply it to pilot customers, I'll try. Thanks again.
    – Orkun Kasapoglu
    Sep 29, 2022 at 11:46

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