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Ubuntu

Ethernet frequently disconnects in ubuntu 20.04

Abhishek Dubey

11/25/22, 11:00 AM

I have recently performed a fresh installation of Ubuntu 20.04 on Lenovo Thinkpad X201. I have encountered a strange problem : Wifi works fine. Mobile internet tethering through USB works fine. However, when I connect through ethernet cable, internet connects initially. I can browse website. However, after 10sec-1min, the network shows connected but cannot browse websites. If I re-plug the ethernet cable, it again works for 10sec. If I switch off and on the ethernet connection from settings, again it works well for 10s-1min and again the same thing.

/etc/resolve.conf

  GNU nano 4.8                    /etc/resolv.conf                              
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
options edns0 trust-ad

01-network-manager-all.yaml

GNU nano 4.8              01-network-manager-all.yaml

sudo lshw -c network

  *-network                 
       description: Ethernet interface
       product: 82577LM Gigabit Network Connection
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: enp0s25
       version: 06
       serial: f0:de:f1:3f:55:d8
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.12-1 ip=172.16.11.245 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:31 memory:f2500000-f251ffff memory:f2525000-f2525fff ioport:1820(size=32)
  *-network DISABLED
       description: Wireless interface
       product: RTL8191SEvB Wireless LAN Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 10
       serial: 5c:ac:4c:bd:f2:3f
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8192se driverversion=5.8.0-43-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:16 ioport:3000(size=256) memory:f2400000-f2403fff

** Please find output of sudo journalctl -b 0 -u NetworkManager here

** ping 9.9.9.9**.

PING 9.9.9.9 (9.9.9.9) 56(84) bytes of data.
^C 
--- 9.9.9.9 ping statistics ---
42 packets transmitted, 0 received, 100% packet loss, time 41962ms

** uname -a**

Linux abhishek 5.8.0-63-generic #71~20.04.1-Ubuntu SMP Thu Jul 15 17:46:08 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

cat /sys/class/net/enp0s25/device/power/control

on

140

0 + 9

networking

20.04

waltinator

11/25/22, 2:08 PM

Look at the logs! `sudo journalctl -b 0 -u NetworkManager`. Read `man journalctl`.

Abhishek Dubey

11/25/22, 4:41 PM

@waltinator I am not able to see anything special. '<info> [1627230950.8105] manager: NetworkManager state is now CONNECTED_GLOBAL' This is what I see between switching ON/OFF ethernet connection from settings. When the internet goes off after 10-15sec, it does not show anything specific.

waltinator

11/25/22, 4:51 PM

Comments are designed for US to ask YOU questions about your Question. You should [Edit] your question to add information. By updating your Question, and using the formatting buttons, you make all the information available to new readers. People shouldn't have to read a long series of comments to get the whole story.

Abhishek Dubey

11/26/22, 7:18 AM

@waltinator I have appended a gist link to the log file ( could not copy-paste entire file due to word limit).

Jags

11/26/22, 7:36 AM

@abhishek-dubey when you cannot browse websites after around 10 sec, does `ping` still work or no? From the `terminal` you can try `ping 9.9.9.9`. Please edit your question, and add result of ping. Thanks.

waltinator

11/26/22, 1:10 PM

Sorry, I don't analyze logvomit. Read the log yourself, line-by-line, and add a few significant lines to your question.

Jags

11/28/22, 5:36 PM

@abhishek-dubey Please run `uname -a` and post the output. Thanks.

Jags

11/28/22, 5:42 PM

@abhishek-dubey Also post output of `cat /sys/class/net/enp0s25/device/power/control`

Abhishek Dubey

11/29/22, 5:18 PM

@Jags I have updated both of them. Seems like power control for ethernet is on.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ethernet frequently disconnects in ubuntu 20.04

TH: Ethernet ตัดการเชื่อมต่อบ่อยครั้งใน Ubuntu 20.04

RO: Ethernet se deconectează frecvent în ubuntu 20.04

RU: Ethernet часто отключается в Ubuntu 20.04

VI: Ethernet thường xuyên bị ngắt kết nối trong Ubuntu 20.04

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