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#1 2016-06-07 13:27:47

jrl
Member
Registered: 2016-02-12
Posts: 18

[SOLVED] Ethernet stopped working

Ethernet connection on my Arch system suddenly stopped working. I occasionally run Windows 10 on the same PC and it works fine on that.

Here's the output of ip link.

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 1c:c1:de:a9:58:e6 brd ff:ff:ff:ff:ff:ff
3: wlp68s0b1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:17:93:d7:8c:fc brd ff:ff:ff:ff:ff:ff

And dmesg | grep e1000e

[    4.351028] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[    4.351032] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[    4.352682] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[    4.585470] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 1c:c1:de:a9:58:e6
[    4.585477] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[    4.585528] e1000e 0000:00:19.0 eth0: MAC: 9, PHY: 10, PBA No: FFFFFF-0FF
[    4.721794] e1000e 0000:00:19.0 enp0s25: renamed from eth0
[    6.618287] e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
[    6.618300] e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO

Drivers are loaded and the ethernet link is UP but websites are not loaded and I'm unable to ping Google.

 > ping 8.8.8.8
connect: Network is unreachable
 > ping www.google.com
ping: www.google.com: Name or service not known

Is there anything else I could check?

Last edited by jrl (2016-06-09 11:55:26)

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#2 2016-06-07 15:02:15

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,740

Re: [SOLVED] Ethernet stopped working

What are the output of ip addr and ip route  ?


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
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#3 2016-06-08 05:31:15

jrl
Member
Registered: 2016-02-12
Posts: 18

Re: [SOLVED] Ethernet stopped working

ewaller wrote:

What are the output of ip addr and ip route  ?

No output from ip route.

> ip route
> ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 1c:c1:de:a9:58:e6 brd ff:ff:ff:ff:ff:ff
    inet6 fe90::92b8:1e0a:b97a:a210/86 scope link 
       valid_lft forever preferred_lft forever
3: wlp68s0b1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 00:17:93:d7:8c:fc brd ff:ff:ff:ff:ff:ff

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#4 2016-06-08 06:19:02

coruun
Member
Registered: 2014-10-23
Posts: 26

Re: [SOLVED] Ethernet stopped working

How is your network configured? DHCP (dynamic) or static?

Just a thought: A few days ago, systemd got updated. Do you use systemd-networkd and your configuration was messed up?

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#5 2016-06-08 07:07:05

Head_on_a_Stick
Member
From: London
Registered: 2014-02-20
Posts: 7,680
Website

Re: [SOLVED] Ethernet stopped working

You have no IP addresses assigned to your ethernet connection.

This should bring you up immediately:

# dhcpcd enp0s25

By which method are you managing your connection?

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#6 2016-06-08 12:17:40

jrl
Member
Registered: 2016-02-12
Posts: 18

Re: [SOLVED] Ethernet stopped working

coruun wrote:

How is your network configured? DHCP (dynamic) or static?

Just a thought: A few days ago, systemd got updated. Do you use systemd-networkd and your configuration was messed up?

I pretty sure I'm using DHCP. I think I ran a full system update on 3rd and did not have ethernet connection when I booted the system again on 6th. I have the start job issue with dhcpcd (https://bbs.archlinux.org/viewtopic.php?id=213363).

Head_on_a_Stick wrote:

You have no IP addresses assigned to your ethernet connection.

This should bring you up immediately:

# dhcpcd enp0s25

By which method are you managing your connection?

dhcpcd times out and doesn't seem to change anything.

enp0s25: hardware address ... claims 0.0.0.0
enp0s25: soliciting a DHCP lease
enp0s25: offered ... from ...
enp0s25: probing address ...
timed out
dhcpcd exited

Last edited by jrl (2016-06-08 12:21:05)

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#7 2016-06-09 06:57:20

Head_on_a_Stick
Member
From: London
Registered: 2014-02-20
Posts: 7,680
Website

Re: [SOLVED] Ethernet stopped working

jrl wrote:

I pretty sure I'm using DHCP

What is the output of:

systemctl list-unit-files | grep enabled

Can you assign the IP addresses manually?
https://wiki.archlinux.org/index.php/Ne … assignment

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#8 2016-06-09 07:00:05

jasonwryan
Anarchist
From: .nz
Registered: 2009-05-09
Posts: 30,424
Website

Re: [SOLVED] Ethernet stopped working

Or even

systemctl list-unit-files --state enabled

smile


Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438

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#9 2016-06-09 07:00:34

Head_on_a_Stick
Member
From: London
Registered: 2014-02-20
Posts: 7,680
Website

Re: [SOLVED] Ethernet stopped working

^ Nice, thanks!
smile

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#10 2016-06-09 07:18:18

tmp-meteque
Member
Registered: 2015-12-11
Posts: 30

Re: [SOLVED] Ethernet stopped working

jrl wrote:

dhcpcd times out and doesn't seem to change anything.

enp0s25: hardware address ... claims 0.0.0.0
enp0s25: soliciting a DHCP lease
enp0s25: offered ... from ...
enp0s25: probing address ...
timed out
dhcpcd exited

dhcpcd 6.11.0-2 loop forever trying to acquire lease


IBM Lenovo T430

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#11 2016-06-09 11:53:17

jrl
Member
Registered: 2016-02-12
Posts: 18

Re: [SOLVED] Ethernet stopped working

I just downgraded the DHCP client and ethernet works again. Thanks a lot everyone!

Last edited by jrl (2016-06-09 11:54:05)

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