Krdytkyu

I am having a terrible week trying to resolve an issue with my ethernet connection. The ethernet works fine for 1 minute before I lose connection. The networks icon to the top constantly reads as connected, but I have to disconnect and reconnect by clicking "Wired connection 1" for a few seconds/mins of connection.

To work around this issue, I have a cron job running every minute to disconnect and reconnect with the following lines of code:

#!/bin/bash

sudo ifdown enp4s0

sudo ifup enp4s0

Please help. I need a more permanent solution for a steady ethernet connection.

lspci | grep -i realtek



04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 

RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 01)



lsmod | grep r816



r8168                 499712  0



dmesg | grep r816

    [    2.207551] r8168: loading out-of-tree module taints kernel.

    [    2.207789] r8168: module verification failed: signature and/or required key missing - tainting kernel

    [    2.208146] r8168 Gigabit Ethernet driver 8.044.02-NAPI loaded

    [    2.208243] r8168 0000:04:00.0: Default use INTx.

    [    2.230190] r8168: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.

    [    2.230194] r8168  Copyright (C) 2017  Realtek NIC software team <nicfae@realtek.com> 

    [    2.305436] r8168 0000:04:00.0 enp4s0: renamed from eth0

    [   23.483150] r8168: enp4s0: link up

    [  866.740512] r8168: enp4s0: link up

    [71714.965195] r8168: enp4s0: link up

    [71773.494292] r8168: enp4s0: link up



sudo ethtool enp4s0



Settings for enp4s0:

    Supported ports: [ TP ]

    Supported link modes:   10baseT/Half 10baseT/Full 

                            100baseT/Half 100baseT/Full 

                            1000baseT/Full 

    Supported pause frame use: No

    Supports auto-negotiation: Yes

    Advertised link modes:  10baseT/Half 10baseT/Full 

                            100baseT/Half 100baseT/Full 

                            1000baseT/Full 

    Advertised pause frame use: No

    Advertised auto-negotiation: Yes

    Speed: Unknown!

    Duplex: Half

    Port: Twisted Pair

    PHYAD: 0

    Transceiver: internal

    Auto-negotiation: on

    MDI-X: Unknown

    Supports Wake-on: pumbg

    Wake-on: ug

    Current message level: 0x00000033 (51)

                   drv probe ifdown ifup

    Link detected: no







ifconfig

enp4s0    Link encap:Ethernet  HWaddr 00:26:18:11:78:a8  

          inet addr:192.168.26.30  Bcast:192.168.27.255  Mask:255.255.254.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:394947 errors:0 dropped:0 overruns:0 frame:0

          TX packets:278710 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:270000748 (270.0 MB)  TX bytes:37833932 (37.8 MB)

          Interrupt:18 Base address:0xa000 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:38302 errors:0 dropped:0 overruns:0 frame:0

          TX packets:38302 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1 

          RX bytes:3045435 (3.0 MB)  TX bytes:3045435 (3.0 MB)



lshw



*-network

                description: Ethernet interface

                product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

                vendor: Realtek Semiconductor Co., Ltd.

                physical id: 0

                bus info: pci@0000:04:00.0

                logical name: enp4s0

                version: 01

                serial: 00:26:18:11:78:a8

                size: 1Gbit/s

                capacity: 1Gbit/s

                width: 64 bits

                clock: 33MHz

                capabilities: bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation

                configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.044.02-NAPI duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s

                resources: irq:18 ioport:d800(size=256) memory:f9fff000-f9ffffff memory:f9fc0000-f9fdffff



cat /etc/network/interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).



# The loopback network interface

auto lo 

iface lo inet loopback







# The primary network interface

auto enp4s0

allow-hotplug enp4s0

iface enp4s0 inet dhcp



pre-up ifconfig enp4s0 hw ether 00:26:18:11:78:A8



cat /etc/NetworkManager/NetworkManager.conf

[main]

plugins=ifupdown,keyfile,ofono

dns=dnsmasq



[ifupdown]

managed=true



uname -r

4.8.0-58-generic

Things I've done:

1) Install the r8168-dkms using Synaptic.

2) Set the IPv6 settings "Method" section to "ignore".

3) Changed my Internet DNS servers to 8.8.8.8,8.8.4.4...etc.

4) Change the "MTU" to 9000.

5) Changed interface file to:
auto lo
iface lo inet loopback
auto enp4s0
iface enp4s0 inet dhcp

as well as for static.

6) sudo apt-get purge r8168-dkms from Ubuntu 14.04 wired connection keep disconnecting

7) Everything on https://unixblogger.com/2011/10/18/the-pain-of-an-realtek-rtl8111rtl8168-ethernet-card/

8) Install older version of r8168, then:

sudo update-initramfs -u 

echo "blacklist r8169" | sudo tee -a /etc/modprobe.d/blacklist.conf

9) Read through pages of https://ubuntuforums dot org/archive/index.php/t-2291730.html

10) Everything on https: //ubuntuforums dot org/showthread.php?t=2248047

11) Cold booting.

12)

sudo sh -c "echo 'net.ipv6.conf.all.disable_ipv6 = 1' >> /etc/sysctl.conf"

sudo sh -c "echo 'net.ipv6.conf.default.disable_ipv6 = 1' >> /etc/sysctl.conf"

sudo sh -c "echo 'net.ipv6.conf.lo.disable_ipv6 = 1' >> /etc/sysctl.conf"

sudo sysctl -p

sudo sed -i 's/false/true/g' /etc/NetworkManager/NetworkManager.conf

sudo reboot -i NOW

13) https: //nosemaj dot org/hardy-r8168

14) Test ethernet cable with other devices.

15) Crying.

16) Asked my mom.

UPDATE #1

dkms status

bbswitch, 0.8, 4.8.0-36-generic, x86_64: installed

bbswitch, 0.8, 4.8.0-58-generic, x86_64: installed

nvidia-375, 375.66, 4.8.0-36-generic, x86_64: installed

nvidia-375, 375.66, 4.8.0-58-generic, x86_64: installed

r8168, 8.041.00: added



modinfo r8168 | grep -i version

version:        8.044.02-NAPI

srcversion:     5388F61A23A68A548D001CF

vermagic:       4.8.0-58-generic SMP mod_unload modversions 



sudo apt-get purge r8168-dkms

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following packages will be REMOVED:

  r8168-dkms*

0 upgraded, 0 newly installed, 1 to remove and 13 not upgraded.

After this operation, 1,109 kB disk space will be freed.

Do you want to continue? [Y/n] y

(Reading database ... 243432 files and directories currently installed.)

Removing r8168-dkms (8.041.00-1) ...



------------------------------

Deleting module version: 8.041.00

completely from the DKMS tree.

------------------------------

Done.

Purging configuration files for r8168-dkms (8.041.00-1) ...

Commands to remove:

sudo apt-get remove r8168-dkms

sudo apt-get purge r8168-dkms

sudo /sbin/modprobe -r r8168

None of these commands removed 8.044.

UPDATE #2

dkms status

bbswitch, 0.8, 4.8.0-36-generic, x86_64: installed

bbswitch, 0.8, 4.8.0-58-generic, x86_64: installed

nvidia-375, 375.66, 4.8.0-36-generic, x86_64: installed

nvidia-375, 375.66, 4.8.0-58-generic, x86_64: installed

r8168, 8.041.00: added



sudo dkms build r8168/8.041.00 -k "$(uname -r)/$(uname -p)"



Kernel preparation unnecessary for this kernel.  Skipping...



Building module:

cleaning build area....

make KERNELRELEASE=4.8.0-58-generic -C /lib/modules/4.8.0-58-generic/build M=/var/lib/dkms/r8168/8.041.00/build....(bad exit status: 2)

ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/r8168-dkms.0.crash'

Error! Bad return status for module build on kernel: 4.8.0-58-generic (x86_64)

Consult /var/lib/dkms/r8168/8.041.00/build/make.log for more information.



cat /var/lib/dkms/r8168/8.041.00/build/make.log



DKMS make.log for r8168-8.041.00 for kernel 4.8.0-58-generic (x86_64)

Tue Jul 11 16:03:35 AST 2017

make: Entering directory '/usr/src/linux-headers-4.8.0-58-generic'

  LD      /var/lib/dkms/r8168/8.041.00/build/built-in.o

  CC [M]  /var/lib/dkms/r8168/8.041.00/build/r8168_n.o

/var/lib/dkms/r8168/8.041.00/build/r8168_n.c: In function ‘rtl8168_fix_features’:

/var/lib/dkms/r8168/8.041.00/build/r8168_n.c:4212:30: error: ‘NETIF_F_ALL_CSUM’ undeclared (first use in this function)

                 features &= ~NETIF_F_ALL_CSUM;

                              ^

/var/lib/dkms/r8168/8.041.00/build/r8168_n.c:4212:30: note: each undeclared identifier is reported only once for each function it appears in

/var/lib/dkms/r8168/8.041.00/build/r8168_n.c: In function ‘rtl8168_start_xmit’:

/var/lib/dkms/r8168/8.041.00/build/r8168_n.c:24599:12: error: ‘struct net_device’ has no member named ‘trans_start’

         dev->trans_start = jiffies;

            ^

scripts/Makefile.build:289: recipe for target '/var/lib/dkms/r8168/8.041.00/build/r8168_n.o' failed

make[1]: *** [/var/lib/dkms/r8168/8.041.00/build/r8168_n.o] Error 1

Makefile:1491: recipe for target '_module_/var/lib/dkms/r8168/8.041.00/build' failed

make: *** [_module_/var/lib/dkms/r8168/8.041.00/build] Error 2

make: Leaving directory '/usr/src/linux-headers-4.8.0-58-generic'

UPDATE #3

After trying and failing with r8168 V 8.042... I tried version 8.043.02 and had some sort of success, although we're not at the final solution yet.

sudo dkms build r8168/8.043.02 -k "$(uname -r)/$(uname -p)"

Module r8168/8.043.02 already built for kernel 4.8.0-58-generic/4



sudo dkms install r8168/8.043.02 -k "$(uname -r)/$(uname -p)"

Module r8168/8.043.02 already installed on kernel 4.8.0-58-generic/x86_64



dkms status

bbswitch, 0.8, 4.8.0-58-generic, x86_64: installed

nvidia-375, 375.66, 4.8.0-58-generic, x86_64: installed

r8168, 8.043.02, 4.8.0-58-generic, x86_64: installed (WARNING! Diff between built and installed module!)

UPDATE #4

ls -al /var/lib/dkms/r8168

total 12

drwxr-xr-x 3 root root 4096 Jul 11 16:43 .

drwxr-xr-x 5 root root 4096 Jul 11 16:42 ..

drwxr-xr-x 4 root root 4096 Jul 11 16:43 8.043.02

lrwxrwxrwx 1 root root   32 Jul 11 16:43 kernel-4.8.0-58-generic-x86_64 -> 8.043.02/4.8.0-58-generic/x86_64



modinfo r8168 | grep -i version

version:        8.044.02-NAPI

srcversion:     5388F61A23A68A548D001CF

vermagic:       4.8.0-58-generic SMP mod_unload modversions 





ls -al /lib/modules/4.8.0-58-generic/updates/dkms

total 18624

drwxr-xr-x 2 root root     4096 Jul  1 11:01 .

drwxr-xr-x 3 root root     4096 Jul  1 11:00 ..

-rw-r--r-- 1 root root    22720 Jul  1 11:00 bbswitch.ko

-rw-r--r-- 1 root root    85488 Jul  1 11:01 nvidia_375_drm.ko

-rw-r--r-- 1 root root 16735368 Jul  1 11:01 nvidia_375.ko

-rw-r--r-- 1 root root  1086360 Jul  1 11:01 nvidia_375_modeset.ko

-rw-r--r-- 1 root root  1124728 Jul  1 11:01 nvidia_375_uvm.ko



modinfo /lib/modules/4.8.0-58-generic/updates/dkms/r8168.ko

modinfo: ERROR: Module /lib/modules/4.8.0-58-generic/updates/dkms/r8168.ko not found.

UPDATE 5

It seems as though this command removed the 8.044 driver and now all that's left is the 8.043.02 driver.

sudo apt-get -y dist-upgrade

From the comments...

1. you really do need to run r8168-dkms in your configuration




2. undo all of the changes that you've made... they didn't fix the problem, only created new ones




3. After closer review, I see that you're using the r8168-dkms (8.044.02-NAPI) for Ubuntu 17.10 (on a 16.04 system). Please install the correct version and retest.




4. In your Network GUI, you have multiple "Wired Connection" profiles set up. They would be named Wired Connection, Wired Connection 1, Wired Connection 2, etc. Delete all except for Wired Connection.

Update #1:

Assuming that the current status is that dkms status shows r8168, 8.041.00 : added...

sudo dkms build r8168/8.041.00 -k "$(uname -r)/$(uname -p)"

sudo dkms install r8168/8.041.00 -k "$(uname -r)/$(uname -p)"

Note: you may have to confirm the correct values of r8168/8.041.00 (module/version) by either looking in /usr/src or /var/lib/dkms/r8168.

dkms status

Should show r8168, 8.041.0 installed.

reboot

modinfo r8168 | grep -i version

Should say 8.041.00.

Update #2:

• r8168 v8.041.00 was too old for 16.04.2 (kernel 4.8.0-58)


• we're now using r8168 v8.043.02

Update #3:

We'll completely remove r8168-dkms and un-blacklist r8169 and then reinstall r8168-dkms from the Ubuntu repos.

• sudo dkms remove r8168/8.043.02 -k "$(uname -r)/$(uname -p)"


• sudo apt-get purge r8168-dkms


• cd /var/lib/dkms


• 
  ls -al
  
  
  
  
  • should not show r8168
  
  
  
  


• cd /usr/src


• 
  ls -al
  
  
  
  
  • should not show r8168.043.02
  
  
  
  


• 
  find /lib -name r8168.ko
  
  
  
  
  • should not show r8168.ko
  
  
  
  


• cd /etc/modprobe.d


• 
  ls -al r8168*
  
  
  
  
  • should show no files
  
  
  
  


• 
  grep -i r816 *
  
  
  
  
  • edit output of grep into question as update #n
  
  
  
  


• cd


• sudo modprobe -r r8168


• sudo update-initramfs -u -k "$(uname -r)"


• stop here, ping me at @heynnema