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On a different host running Ubuntu 18.04 I'm using the Network Manager GUI to configure the 802.1X Security for my Ethernet interface (eth0), leading to /etc/NetworkManager/system-connections having these lines:

[802-1x]
eap=md5;
identity=userid
password=***

Now, clearly Raspbian is not Ubuntu, so there's no Network Manager.
Therefore I wonder how can I do the same on my Raspberry Pi 4 running Raspbian 10 (buster)?

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802.1x authentication is handled by wpa_supplicant. man wpa_supplicant.conf and scroll down to the 802.1x example.

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There is a more elaborate explanation on https://help.ubuntu.com/community/Network802.1xAuthentication or https://wiki.archlinux.org/index.php/WPA_supplicant.

Basically, it has the following steps:

  • add the network to /etc/wpa_supplicant.conf
  • start wpa_supplicant for the interface eth0
  • sometimes, it is necessary to do some extra steps.
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