#871949 network-manager: Network disconnects randomly

Package:
network-manager
Source:
network-manager
Description:
network management framework (daemon and userspace tools)
Submitter:
Victor Porton
Date:
2021-03-07 12:39:03 UTC
Severity:
important
#871949#5
Date:
2017-08-12 21:22:18 UTC
From:
To:
Dear Maintainer,

Normally "Network" window shows:
- IPv4 Address 10.0.0.8
- IPv6 Address XXX
- Hardware Address: XXX
- Default Route: 10.0.0.138
- DNS: 10.0.0.138

Sometimes it becomes:
- IPv6 Address XXX
- Hardware Address: XXX
- DNS: 10.0.0.138

So "IPv4 Address" and "Default Route" stop working and the network
ceases to work.

I updated to network-manager 1.8.2-1 from "buster" in my "stretch"
Debian installation, but this hasn't solved the trouble.
#871949#10
Date:
2017-08-12 22:14:53 UTC
From:
To:
I forgot to say that I use a Ethernet-connected-to-my-PC router with
DHCP in the router to connect my PC to Internet.
#871949#15
Date:
2017-11-19 14:23:49 UTC
From:
To:
After some upgrades of my Debian Linux "stretch" including

sudo apt install -t=stretch-backports evolution network-manager

the bug did not disappeared, but now when network disconnects, there is
no more visible indication of the bug in Gnome 3 panel. The connection
icon (near the top right corner of the screen) remains active (there
are no symptoms of disconnection).

Otherwise the bug remains the same: I need to disconnect and connect
again about every hour of half for the network to work.
#871949#20
Date:
2018-01-23 03:57:26 UTC
From:
To:
Jan 23 05:50:28 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:50:39 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:50:52 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:51:08 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:51:27 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:51:42 victor dhclient[1389]: DHCPREQUEST of 10.0.0.7 on eth0
to 255.255.255.255 port 67
Jan 23 05:51:49 victor avahi-daemon[665]: Withdrawing address record
for 10.0.0.7 on eth0.
Jan 23 05:51:49 victor avahi-daemon[665]: Leaving mDNS multicast group
on interface eth0.IPv4 with address 10.0.0.7.
Jan 23 05:51:49 victor avahi-daemon[665]: Interface eth0.IPv4 no longer
relevant for mDNS.
Jan 23 05:51:49 victor NetworkManager[663]: <info>  [1516679509.3378]
manager: NetworkManager state is now CONNECTED_SITE
Jan 23 05:51:49 victor dbus-daemon[647]: [system] Activating via
systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-
org.freedesktop.nm-dispatcher.service' requested by ':1
.11' (uid=0 pid=663 comm="/usr/sbin/NetworkManager --no-daemon ")
Jan 23 05:51:49 victor systemd[1]: Starting Network Manager Script
Dispatcher Service...
Jan 23 05:51:49 victor gsd-sharing[2183]: Failed to StopUnit service:
GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-remote-
desktop.service not loaded.
Jan 23 05:51:49 victor dbus-daemon[647]: [system] Successfully
activated service 'org.freedesktop.nm_dispatcher'
Jan 23 05:51:49 victor systemd[1]: Started Network Manager Script
Dispatcher Service.
Jan 23 05:51:49 victor nm-dispatcher: req:1 'connectivity-change': new
request (1 scripts)
Jan 23 05:51:49 victor nm-dispatcher: req:1 'connectivity-change':
start running ordered scripts...
Jan 23 05:51:50 victor NetworkManager[663]: <info>  [1516679510.2724]
dhcp4 (eth0): state changed bound -> expire
Jan 23 05:51:50 victor NetworkManager[663]: <info>  [1516679510.3046]
dhcp4 (eth0): canceled DHCP transaction, DHCP client pid 1389
Jan 23 05:51:50 victor NetworkManager[663]: <info>  [1516679510.3046]
dhcp4 (eth0): state changed expire -> done
Jan 23 05:51:50 victor NetworkManager[663]: <info>  [1516679510.3049]
device (eth0): scheduling DHCPv4 restart in 120 seconds, 3 tries left
(reason: lease expired)
#871949#25
Date:
2018-02-05 13:41:58 UTC
From:
To:
From journalctl output (attached).

It seems that DHCP lease expires and after that DHCP does not start work again. Why?

Help me to make my network stable!!!
#871949#30
Date:
2021-03-03 13:06:24 UTC
From:
To:
Hello kind people of Debian,

reportbug did not ask me for the relevant journalctl entry... so here it is attached.

I am a Debian sysadmin (not a developer sorry). This is on my personal MacBookPro.

paul
#871949#35
Date:
2021-03-04 08:33:26 UTC
From:
To:
Dear Maintainer,


   * What led up to the situation?

The disconnecting and reconnecting of the wifi happened also in the past (several months ago), but suddenly stopped. I update Debian every day. Some two weeks ago it started again. This is the same computer for three years now, same wifi, same location, same modem/router, same ISP, nothing changes except for the aptitude upgrade.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

I googled the problem a lot the past few days.
I added "wifi,powersafe=2' to NetworkManager.conf (because this is suggested in a forum).
I reinstalled broadcom-sta-dkms.
Yesterday I uninstalled dhclient (isc-dhcp-client), but that also makes no difference.
I upgrade Debian every day.

   * What was the outcome of this action?

No difference, the wifi keeps disconnecting (and reconnecting) often.

   * What outcome did you expect instead?

A stable wifi connection, these interrupts are distracting.
#871949#40
Date:
2021-03-04 08:53:21 UTC
From:
To:
Hello kind people of Debian,

I think this attachment may also be of interest. It is the output of

journalctl | grep CTRL-EVENT-DISCONNECTED | tail -30

It shows the disconnects interval, which is often (but not always) close to one
hour. That's why I though DHCP lease time and uninstalled isc-dhcp-client. It didn't
help.

paul
#871949#45
Date:
2021-03-07 12:37:33 UTC
From:
To:
The problem seems solved.
I changed the ipv6 settings in the NetworkManager GUI to use EUI64 and now there are
no more disconnects.

(I also kept doing aptitude update && aptitude upgrade daily.)

paul