Ethernet connection drops after some time

xnand · 2017-03-18 18:52:15

I don't know why, but when i power on my pc everything works fine. Then after say 30 mins, the ethernet connection stops working. Pinging 8.8.8.8 gives me me this:

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.1.100 icmp_seq=1 Destination Host Unreachable

I am also connected with wifi, so i type:

sudo ip route del default dev enp2s0

to route everything trough it. This way i have internet connection back, but i want it trough the ethernet cable. So trying to insert back the route:

sudo ip route add 0/0 via 192.168.1.254 metric 100 dev enp2s0

but it gives me the same problem. I can talk to lan devices, but can't reach wan. Everything in the routing tables seem fine:

┌andrei:~ [19:29:10]
└─(✓)─> ip route
default via 192.168.1.254 dev enp2s0 proto static metric 100 
default via 192.168.1.254 dev wlp3s0 proto static metric 600 
192.168.1.0/24 dev wlp3s0 proto kernel scope link src 192.168.1.91 
192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.100 metric 100 
192.168.1.0/24 dev wlp3s0 proto kernel scope link src 192.168.1.91 metric 600

and the ip address didn't change.
I am not connected to the main router directly. There is a powerline (Netgear AV500) attached to it, then one in my room that connects to a second router, to which is attached my pc and a raspberry pi. They are in the same subnet, and everything has a static ip assigned (actually i always request the same ip with DHCP): 192.168.1.254 is the main router (the one attached to wan), .253 is the one in my room, .100 is my pc. Wifi is taken directly from the original router. I am not sure if the problem comes from the powerline or from my pc, however if i reboot the computer everything works again.
Can someone help me understand, please?

PS: 192.168.1.91 is one of the powerline's ip, don't know which one though

Last edited by xnand (2017-03-18 18:54:56)

jasonwryan · 2017-03-18 18:56:36

How do you manage the connection? Please paste the output of:

systemctl list-unit-files --state enabled

xnand · 2017-03-18 19:06:26

With NetWorkManager (Gnome 3)

┌andrei:~ [19:54:44]
└─(✓)─> sudo systemctl list-unit-files --state enabled
[sudo] password for andrei: 
UNIT FILE                                   STATE  
org.cups.cupsd.path                         enabled
autovt@.service                             enabled
dbus-fi.w1.wpa_supplicant1.service          enabled
dbus-org.freedesktop.NetworkManager.service enabled
dbus-org.freedesktop.nm-dispatcher.service  enabled
display-manager.service                     enabled
gdm.service                                 enabled
getty@.service                              enabled
NetworkManager-dispatcher.service           enabled
NetworkManager.service                      enabled
org.cups.cupsd.service                      enabled
sshd.service                                enabled
systemd-timesyncd.service                   enabled
wol@.service                                enabled
wpa_supplicant.service                      enabled
org.cups.cupsd.socket                       enabled
tftpd.socket                                enabled
remote-fs.target                            enabled
fstrim.timer                                enabled
pkgfile-update.timer                        enabled

20 unit files listed.

andrei:~ [20:05:23]
└─(✓)─> sudo systemctl status NetworkManager
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2017-03-18 18:10:49 CET; 1h 55min ago
     Docs: man:NetworkManager(8)
 Main PID: 335 (NetworkManager)
    Tasks: 5 (limit: 4915)
   CGroup: /system.slice/NetworkManager.service
           ├─  335 /usr/bin/NetworkManager --no-daemon
           └─27280 /usr/bin/dhclient -d -q -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /run/dhclient-wlp3s0.pid -lf /var/lib/NetworkManager/

Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5101] dhcp4 (wlp3s0):   address 192.168.1.91
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5101] dhcp4 (wlp3s0):   plen 24 (255.255.255.0)
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5102] dhcp4 (wlp3s0):   gateway 192.168.1.254
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5102] dhcp4 (wlp3s0):   server identifier 192.168.1.254
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5102] dhcp4 (wlp3s0):   lease time 3600
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5102] dhcp4 (wlp3s0):   nameserver '192.168.1.254'
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5102] dhcp4 (wlp3s0):   nameserver '62.101.93.101'
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5103] dhcp4 (wlp3s0):   nameserver '83.103.25.250'
Mar 18 19:39:26 nebula NetworkManager[335]: <info>  [1489862366.5103] dhcp4 (wlp3s0): state changed bound -> bound
Mar 18 19:39:26 nebula dhclient[27280]: bound to 192.168.1.91 -- renewal in 1738 seconds.

jasonwryan · 2017-03-18 20:34:23

Disable all the other network services and just enable NetworkManager.service.

xnand · 2017-03-18 21:23:54

Okay, now i only have these

UNIT FILE                                   STATE  
autovt@.service                             enabled
dbus-org.freedesktop.NetworkManager.service enabled
dbus-org.freedesktop.nm-dispatcher.service  enabled
display-manager.service                     enabled
gdm.service                                 enabled
getty@.service                              enabled
NetworkManager-dispatcher.service           enabled
NetworkManager.service                      enabled
sshd.service                                enabled
systemd-timesyncd.service                   enabled
wol@.service                                enabled
tftpd.socket                                enabled
remote-fs.target                            enabled
fstrim.timer                                enabled
pkgfile-update.timer                        enabled

15 unit files listed.

Let's see if it was one of the services i disabled. However, i don't see any conflicting service among those

Last edited by xnand (2017-03-18 22:25:09)

xnand · 2017-03-19 11:38:53

Nope, i still have the same problem.
I noticed that on the raspberry pi the connection is stable, where i don't use NetworkManager. On the raspberry i only have these:

autologin@.service                     enabled 
avahi-daemon.service                   enabled 
bluetooth.service                      enabled 
cron.service                           enabled 
dbus-org.bluez.service                 enabled 
dbus-org.freedesktop.Avahi.service     enabled 
dhcpcd.service                         enabled 
fake-hwclock.service                   enabled 
hciuart.service                        enabled 
hwclock-save.service                   enabled 
rpi-display-backlight.service          enabled 
rsyslog.service                        enabled 
ssh.service                            enabled 
sshswitch.service                      enabled 
syslog.service                         enabled 
avahi-daemon.socket                    enabled 
default.target                         enabled 
multi-user.target                      enabled 
remote-fs.target                       enabled

rsmarples · 2017-03-19 21:54:12

If dhcpcd is stable on the Pi for you, consider using it everywhere?

Arch Linux

#1 2017-03-18 18:52:15

Ethernet connection drops after some time

#2 2017-03-18 18:56:36

Re: Ethernet connection drops after some time

#3 2017-03-18 19:06:26

Re: Ethernet connection drops after some time

#4 2017-03-18 20:34:23

Re: Ethernet connection drops after some time

#5 2017-03-18 21:23:54

Re: Ethernet connection drops after some time

#6 2017-03-19 11:38:53

Re: Ethernet connection drops after some time

#7 2017-03-19 21:54:12

Re: Ethernet connection drops after some time

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