cmst installation broke Wifi connection

debian_ninja · 11-02-2018, 08:40 AM

Hi,

I'm new here, so do not hesitate to correct me if I'm doing things the wrong way.

Setup
Debian GNU/Linux 9 (stretch) 64-bit

Situation
I tried to install cmst application (https://packages.debian.org/sid/cmst), and my wifi connection broke right after : i can detect a network and connect to Wifi but i cannot load any website.
I tried to uninstall it (with apt-get --purge remove), yet nothing changed. Whenever I try to connect to any website with Chromium or Firefox ESR, it displays the following :

Code:

This site can’t be reached
www.google.com’s server IP address could not be found.
Try:

Checking the connection
Checking the proxy, firewall, and DNS configuration
ERR_NAME_NOT_RESOLVED

Troubleshooting
I found a post on this forum describing the same issue on Fedora : https://www.linuxquestions.org/quest...on-4175640073/
He ran some tests to fix the issue, and found out that he could partially fix it (but the problem would still occur whenever he rebooted his computer) :

Code:

root@ninja# ping -c 2 www.google.com
ping: www.google.com: Name or service not known
root@ninja# iwconfig
lo        no wireless extensions.

wlp2s0    IEEE 802.11  ESSID:"ninja_box"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:19:71:4C:72:7A   
          Bit Rate=130 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on
          Link Quality=47/70  Signal level=-63 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:108   Missed beacon:0

enp3s0f1  no wireless extensions.

root@ninja# dhclient wlp2s0
RTNETLINK answers: File exists
root@ninja# ping -c 2 www.google.com
PING www.google.com (108.177.15.106) 56(84) bytes of data.
64 bytes from wr-in-f106.1e100.net (108.177.15.106): icmp_seq=1 ttl=40 time=39.2 ms
64 bytes from wr-in-f106.1e100.net (108.177.15.106): icmp_seq=2 ttl=40 time=29.3 ms

--- www.google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 29.315/34.278/39.241/4.963 ms

At the end of the topic, the OP said he managed to "fix" it by editing a network configuraton file :

Code:

[root@E7440-DELL home]# cat /etc/sysconfig/network
# Created by anaconda
NETWORKING=yes

dhclient wlp2s0

This is a solution he found under Fedora and I'm a Debian 9 user, so I have no idea what file to edit.

Question
As I am not an experienced Debian user, I do not understand what's broken nor how I could repair it. Is there any way to repair the damage I've done installing cmst ? Or
is there at least a way to "fix" this problem like the Fedora user ?

Thanks in advance !