nmcli

nmcli is the command-line client for NetworkManager.

Connect to a wifi network

Connecting using another wifi adapter:

nmcli device wifi connect 'WLAN SSID' ifname wlo2 -a

Connecting to eduroam

nmcli connection add type wifi ifname wlo1 con-name eduroam ssid eduroam

wlo1 is the interface, con-name eduroam will be the filename, and ssid eduroam the ssid of the wifi access point.

Then modify the connection file:

/etc/NetworkManager/system-connections/eduroam.nmconnection

[connection]
id=eduroam
uuid=ac58f10c-fab7-46c3-b513-8b18113e6f16
type=wifi
interface-name=wlo1

[wifi]
mode=infrastructure
ssid=eduroam

[wifi-security]
key-mgmt=wpa-eap

[802-1x]
eap=ttls;
identity=<university email or username>
password=<password>
phase2-auth=pap

[ipv4]
method=auto

[ipv6]
addr-gen-mode=stable-privacy
method=auto

[proxy]

This config is used for TTLS, PAP, and not validating CA certs.

Then to enable the network:

nmcli conn up id eduroam --ask

I get an error if I do not put --ask option:

Passwords or encryption keys are required to access the wireless network 'eduroam'.
Warning: password for '802-1x.identity' not given in 'passwd-file' and nmcli cannot ask without '--ask' option.
Error: Connection activation failed: Secrets were required, but not provided

List wifi devices

nmcli device

Source

networkmanager.dev