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⚠️ You will lose all WiFi passwords saved in your system ⚠️

These instructions have been tested in ArchLinux without NetworkManager installed. It should work if NetworkManager is disabled and stopped (sudo systemctl --disable now NetworkManager).

You will need systemd-networkd and wpa_supplicant, both of which are normally in default installations of GNU/Linux. To configure it, you will need to find your WiFi and Ethernet interfaces (ifconfig or ip should display them, they should look like enpXsY, ethX, wlanX or wlpXsY).

All files belong to root:root

• /etc/wpa_supplicant/wpa_supplicant-WIFI_INTERFACE.conf, with permissions 600

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
update_config=1

network={
    ssid="UPVNET"
    key_mgmt=WPA_EAP
    eap=PEAP
    phase1="peaplabel=auto tls_disable_tlsv1_2=1"
    phase2="auth=MSCHAPV2"
    ca_cert="/etc/ssl/certs/thawte_Primary_Root_CA.pem"
    identity="x@alumno.upv.es"
    password="y"
    priority=10
}

network={
    ssid="your_home_network_name"
    psk="your_home_network_password"
}

• /etc/systemd/network/WIFI_INTERFACE.network, with permissions 644

[Match]
Name=WIFI_INTERFACE

[Network]
DHCP=yes
UseDomains=yes
IPv6PrivacyExtensions=true

• /etc/systemd/network/ETHERNET_INTERFACE.network, with permissions 644

[Match]
Name=ETHERNET_INTERFACE

[Network]
DHCP=yes

Then, run this:

mv /etc/resolv.conf{,.bak}
ln -s /usr/lib/systemd/resolv.conf /etc/resolv.conf

Finally, enable and start systemd-networkd, systemd-resolved and wpa_supplicant@WIFI_INTERFACE:

sudo systemctl enable --now systemd-networkd systemd-resolved wpa_supplicant@WIFI_INTERFACE