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I am using Debian Stretch/Testing with Xfce. I have an eight year old Acer laptop. I am currently using network-manager-gnome to connect to WiFi from the laptop at the university where I teach.

Most of the time I have no issue. However, something strange has been happening. On Mondays, only on Mondays (every Monday for the past three weeks). My connection will work for about two to three minutes, and then it will slow to a halt. It actually did the same thing today when connected to a WiFi hotspot I created on my phone. My phone works fine on the university WiFi at these same times.

Today, while using network-manager-gnome, my WiFi hotspot connection died. So I disabled Network Manager and I connected to the hotspot via manual configuration. This WiFi connection worked perfectly fine.

For manual configuration I have the /etc/network/interfaces file that sources to the interfaces.d directory. I have created /etc/network/interfaces.d/wlan0. It has content like this: 

auto wlan_home iface wlan_home inet dhcp wpa-ssid home-network-ssid wpa-psk secret-key auto wlan_hotspot iface wlan_hotspot inet dhcp wpa-ssid wifi-hotspot-ssid wpa-psk secret-key

To connect I use the command (example of home network):

sudo ifup wlan0=wlan_home

(I of course have the proper r/w permissions (chmod 600) set to the wlan0 file as well as a generated key instead of my actual password.)

Now to my question. I would like to add the proper configuration information to the wlan0 file to be able to connect to my university network. I would like to be able to connect using this manual configuration for when Network Manager fizzles out. Here is the general information used to connect in nm-connection-editor. I have been unable to find any guide on the proper connection information to place in my file. Otherwise, perhaps the only option is to set up the connection with the wpa_supplicant.conf file.

University WiFi Settings

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2 Answers 2

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I would recommend not to use different network interface for different WLANs, but instead use one interface and the roaming mode if wpa_supplicant, using wpa_supplicant.conf for the WLAN details. That's how I do it on my laptop.

So my /etc/network/interfaces looks like

iface wlan0 inet dhcp wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

and in my wpa_supplicant.conf, I have something like

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev network={ ssid="first_ssid" psk="blah1" priority=30 } network={ ssid="second_ssid" psk="blah2" priority=50 }

etc. Nice and easy. I have't set up EAP this way yet, but there are options you can use to specify this.

You can also use wpa_cli or wpa_gui to add other networks etc. on the fly, if needed. wpa_cli is scriptable.

(Of course the really interesting question is: what happens every Monday to make your connection fail?)

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  • I went ahead and posted my own answer because it had the details on how I was able to connect to my university wifi. You have my upvote at least. You got me going in the right direction. I appreciate it. By the way, today (Monday), I used the wpa_supplicant to connect to wifi instead of Network Manager, and it was the first Monday where the wifi did not disconnect on my laptop. Perhaps one day this mystery will be revealed to me. Commented Feb 14, 2017 at 3:05
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    I think I know the most likely culprit of why I always had network connection issues on Mondays. I did not have a throttle set for the download speed for Dropbox. On Mondays, Dropbox would be syncing all the files from over the weekend. It would hoard my connection, and this caused the entire connection on my laptop to disconnect. After throttling the download speed, all works well. (I hope I can eventually move away from Dropbox to something like NextCloud. It's my only proprietary program on this machine.) I am still using WPA Supplicant though. Nice to have that option. Commented Mar 4, 2017 at 19:44
  • BTW, I use dropbox-uploader to manually upload and manage dropbox file. No automatic syncing, and I didn't install the official propriety dropbox software. Commented Mar 5, 2017 at 7:04
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Here is what I have for my /etc/network/interfaces file. 

# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). #source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet dhcp # Wifi network interface allow-hotplug wlan0 #iface wlan0 inet manual # wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf iface wlan0 inet dhcp wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf #iface default inet dhcp

Above you see the lines with iface wlan0 inet manual and below it wpa-roam... commented out. With this setting my wifi would not reconnect after system suspend without rebooting.

Here is my setup for the /etc/wpa_supplicant/wpa_supplicant.conf file.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev network={ ssid="University-Network-Name" scan_ssid=1 key_mgmt=WPA-EAP identity="my-username" password="secret-password" eap=PEAP phase1="peaplabel=0" phase2="auth=MSCHAPV2" priority=30 } network={ ssid="home-ssid-name" psk="secret-password" priority=40 }
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