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#1 2022-11-17 19:36:07

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

[SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

Hi all,

I'm trying to make my ethernet device network be operation to no avail.

ip addr show

Output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 98:fa:9b:ad:8a:a6 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 28:39:26:78:74:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.35/24 brd 192.168.1.255 scope global noprefixroute wlp2s0
       valid_lft forever preferred_lft forever
    inet6 fe80::aff4:c245:220f:810d/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

On the other hand, it comes up as unavailable in the status menu.

nmcli dev status

Output:

DEVICE  TYPE      STATE        CONNECTION
wlp2s0  wifi      connected    TOPNET_4400
enp3s0  ethernet  unavailable  --
lo      loopback  unmanaged    --

finally:

nmcli connection show
NAME                UUID                                  TYPE      DEVICE
TOPNET_4400         a82cebc1-b91c-49c6-b792-9adc41fadd79  wifi      wlp2s0
Wired connection 1  580be7ba-7730-36e2-948b-874de06df368  ethernet  --

I'm at my wit's ends. What information should I track down so I can bring the interface to life. Thank you.

Last edited by DynamicallyAdjusted (2022-11-18 20:19:06)

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#2 2022-11-17 19:39:13

Slithery
Administrator
From: Norfolk, UK
Registered: 2013-12-01
Posts: 5,636

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

NO CARRIER means that it's not physically connected to the network.
I'd guess that your cable is broken.


No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

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#3 2022-11-17 19:58:15

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

Slithery wrote:

NO CARRIER means that it's not physically connected to the network.
I'd guess that your cable is broken.

Thank you for the quick reply. I tried with two cables that work fine with another laptop, same message gets displayed.

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#4 2022-11-17 20:05:50

d.ALT
Member
Registered: 2019-05-10
Posts: 363

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

Do the LEDs onto the Ethernet NIC blink when you plug-in the patch cord?


<49,17,III,I>    Fama di loro il mondo esser non lassa;
<50,17,III,I>    misericordia e giustizia li sdegna:
<51,17,III,I>    non ragioniam di lor, ma guarda e passa.

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#5 2022-11-17 20:09:06

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

d.ALT wrote:

Do the LEDs onto the Ethernet NIC blink when you plug-in the patch cord?

They don't. In fact, that what made me go through the RJ cables in the first place.

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#6 2022-11-17 20:12:07

d.ALT
Member
Registered: 2019-05-10
Posts: 363

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

DynamicallyAdjusted wrote:
d.ALT wrote:

Do the LEDs onto the Ethernet NIC blink when you plug-in the patch cord?

They don't. In fact, that what made me go through the RJ cables in the first place.

Slithery wrote:

NO CARRIER means that it's not physically connected to the network.
I'd guess that your cable is broken.

Or broken hardware.

If you keep the patch cord plugged-in and then reboot the computer, do you get LED blinking at some point?


<49,17,III,I>    Fama di loro il mondo esser non lassa;
<50,17,III,I>    misericordia e giustizia li sdegna:
<51,17,III,I>    non ragioniam di lor, ma guarda e passa.

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#7 2022-11-17 20:21:13

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

d.ALT wrote:
DynamicallyAdjusted wrote:
d.ALT wrote:

Do the LEDs onto the Ethernet NIC blink when you plug-in the patch cord?

They don't. In fact, that what made me go through the RJ cables in the first place.

Slithery wrote:

NO CARRIER means that it's not physically connected to the network.
I'd guess that your cable is broken.

Or broken hardware.

If you keep the patch cord plugged-in and then reboot the computer, do you get LED blinking at some point?

I just rebooted and they didn't.  I forgot whether I switched to Wifi early on during the installation process, or if I used the eth for a while.  It was a couple of months ago.
I haven't used the Device in a long while.

So I hear you guys, NO CARRIER means Cable broken/Hardware not able to sense cable, period. Is that correct?

Last edited by DynamicallyAdjusted (2022-11-17 20:22:08)

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#8 2022-11-17 21:19:22

seth
Member
Registered: 2012-09-03
Posts: 33,622

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

no carrier means that there's no low-level signal between to NICs.

Typical causes are
1. broken cable
2. loose plug on either side
3. broken cable
4. broken jack on either side
5. broken cable
6. otherwise defective HW on either side
7. broken cable
8. firmware issue (is there a parallel windows? - this is actually more "fringe" and less "typical")
9. broken cable

If you're sure the cables are ok, I'd look at how firmly they're seated (on either side) - otherwise whether there're any errors in the system journal (firmware loading failure, powering up the NIC etc.)

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#9 2022-11-17 21:20:23

xerxes_
Member
Registered: 2018-04-29
Posts: 501

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

You can boot from ArchLive iso and see if and how it autosetup your Ethernet card and do it similar on installed Arch.

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#10 2022-11-17 21:53:07

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

The second line seems a bit suspicious, if only I could understand it depth what it's saying.

NetworkManager[387]: <info>  [1664783322.2700] settings: (enp3s0): created default wired connection 'Wired connection 1'
NetworkManager[387]: <info>  [1664783322.2701] device (enp3s0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')

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#11 2022-11-17 22:06:27

seth
Member
Registered: 2012-09-03
Posts: 33,622

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

Out of context: not much.
Could imply that there's a second network managing service (dhcpcd) on that device - but nothing on that level (userspace) can possibly explain the missing carrier.

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#12 2022-11-18 20:15:54

DynamicallyAdjusted
Member
Registered: 2022-11-17
Posts: 6

Re: [SOLVED] Ethernet device is down and unavailable [NetworkManager/nmcli

xerxes_ wrote:

You can boot from ArchLive iso and see if and how it autosetup your Ethernet card and do it similar on installed Arch.

Thank you for your suggestion.  I tried the ArchLive iso as well as other distros, and it was down on all. Safe to say, it's broken. I'm going to have to change it.

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