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WiFi: nm-applet, nm-editor, replace NetworkManager

Here in campus we have 2 networks:

eduroam-open, which is open and very restricted
eduroam, which requires authentication and is less restricted.

I have 3 questions.

1. How to actually select the network to use? I was trying nm-applet but
NetworkManager seems to fallback to eduroam-open simply becase it thinks
it is "better":

> Oct 12 18:45:16 t42-debian NetworkManager: <info>  Activation (eth1) New wireless user key requested for network 'eduroam'.
> Oct 12 18:45:16 t42-debian NetworkManager: <info>  Activation (eth1) Stage 2 of 5 (Device Configure) complete.
> Oct 12 18:45:22 t42-debian NetworkManager: <info>  SWITCH: found better connection 'eth1/eduroam-open' than current connection 'eth1/eduroam'.  same_ssid=0, have_link=1
> Oct 12 18:45:22 t42-debian NetworkManager: <info>  Will activate connection 'eth1/eduroam-open'.

2. Where does nm-editor store network passwords? Are those files
encrypted in any way?

3. This is not the first time I am having problems with NetworkManager
here on Debian, so I think I will get rid of it. The question is how to
switch between available WiFi connections without NetworkManager.

For instance I could store network connection parameters unencrypted in
/etc/wpa_supplicant.conf (-rw-------, root:root). How to make WPA
Supplicant select the network I want?


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