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You can use systemd-networkd to simply configure the wired ethernet interface. Please follow to Use systemd-networkd for general networking. You can just use section ♦ Quick Step there and then come back here. To configure the eth0 interface, create this file: rpi ~$ cat > /etc/systemd/network/04-wired.network <<EOF [Match] Name=e* [Network] Address=...


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TL:DR: Ethernet uses an analog signal scheme with five different voltage levels, GPIO pins can only detect digital = two different voltage levels Ethernet uses differential and not single ended signals GPIOs usually support switching speeds in the range of a few 10 MHz while Ethernet (100M and 1G) operate on 125 MHz. Even if a GPIO Pin could read the ...


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Network interface names can be managed by systemd, which provides you with a way to use names you like via .link files. E.g. you can create a file /etc/systemd/network/10-internet.link: [Match] MACAddress=01:23:45:67:89:ab [Link] Name=internet0 Using built-in kernel names such as eth0 may lead to trouble, but you can try to reuse them nevertheless.


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