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Old 02-13-2024, 09:00 AM   #1
Crb999
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my wired connection to active bt hub does not connect to internet.


Hi all,

NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.1 LTS"
Running KDE

A weird thing has happened.

There was a momentary mains power loss, and of course the computers shut down.

My Linux machine rebooted and reported no problem however, it no longer has access to the internet.

It is the data to make that connection that seems to be missing.

This computer is hard wired to a BT wifi hub.

Now folks be gentle. I'm 84 and the head doesn't work like it used to.
Neither does the memory.

Would somebody be kind enough to give me step by step instructions for looking at and re-establishing that connection please.
 
Old 02-13-2024, 09:24 AM   #2
michaelk
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By active hub do you mean the lights indicate a good internet connection?

Does the network manager applet indicate a good wired connection? The three solid boxes connected by a horizontal line? If not the easiest way would be to just restart the computer again.
 
Old 02-13-2024, 11:38 AM   #3
Crb999
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Hi Michaelk,

>By active hub do you mean the lights indicate a good internet connection?

No.

I have three other computers and several phones on that hub, connected by wifi to that hub. They are all good. I'm using a samsung tablet to respond to your questions, again, wifi.

>Does the network manager applet ...

I don't know what that is or where to find it, so I have no answer for you.

I have rebooted several times, to no effect although I can find no oter symptom.

regards chris
 
Old 02-13-2024, 11:59 AM   #4
michaelk
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Do you know how to open a terminal window? Press Ctrl+Alt+T

Copy and paste the output of the command:
ip a
 
Old 02-14-2024, 06:00 AM   #5
Crb999
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Thanks Michaelk
I'll attach a photo
Attached Thumbnails
Click image for larger version

Name:	Linux2.jpg
Views:	13
Size:	205.7 KB
ID:	42564  
 
Old 02-14-2024, 08:43 AM   #6
michaelk
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Your computer does have an IP address so it can communicate with the hub. Do these commands work?
ping 8.8.8.8

ping linuxquestions.org
 
Old 02-15-2024, 02:39 AM   #7
Crb999
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8.8.8.8 reports : networksis unreachable

linuxquestinos.org reports : Temporary failure in name resolution
 
Old 02-15-2024, 03:02 AM   #8
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Have you rebooted the (British Telecom I'm guessing) router box?

Your photo shows an esoteric lxcbr0 but no ethernet! Strange & IDK...
https://bbs.archlinux.org/viewtopic.php?id=244557
 
Old 02-15-2024, 03:27 AM   #9
Crb999
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Aye, it is weird

I suspect the bt lump but I have a problem in so much as my wife's work computer is on an intranet of some sort, and it seems to be ok so I don't want to interfere with it.

thank you for trying.

Regards

Chris
 
Old 02-15-2024, 08:01 AM   #10
michaelk
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Look at the output of the command:
ip r

You should see something like
Quote:
default via 10.0.3.xxx dev xxxxx proto dhcp src 10.0.3.1 metric 100
I am guessing that 10.0.3.xxx is 10.0.3.254. Can you ping 10.0.3.254?

Also look at the output of the command:
resolvectl status

I am guessing the DNS output should look something like:
Quote:
Current DNS Server: 10.0.3.254
DNS Servers: 10.0.3.254
 
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Old 02-16-2024, 02:45 AM   #11
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PM@michaelk: (only) LXC br0 (in photo) blows my (semi-n00b) mind! Any words of wisdom? (container ghost?)
And wouldn't "NO-CARRIER" preclude any communication?

(10.0.3.1 is maybe simply the result of lxc being installed, and not necessarily active nor relevant. IDK lxc)

Re: #12: power off the computer and re-seat the network card

Last edited by ___; 02-16-2024 at 04:36 AM.
 
Old 02-16-2024, 03:42 AM   #12
michaelk
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I obviously messed up. Not the first time.

The actual network adapter might of failed.
 
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Old 02-16-2024, 10:10 AM   #13
Crb999
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lp r reports:

10.0.3.0./24 lxcbr0 broto kernel scope link source
10.0.3.1 linkdown

10.0.3.1 pings fine

resolvectl reports:

global
protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

Link 2:
protocols -Defaultroute +LLMNR mDNS -DNSOverTLS DNSSEC=no/unsupported
 
Old 02-16-2024, 10:57 AM   #14
michaelk
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Post the output of the command:
lspci | grep -i Ethernet

Last edited by michaelk; 02-16-2024 at 10:58 AM.
 
Old 02-16-2024, 02:39 PM   #15
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#14 programmatically asks about your network card.

Can you take it out and plug it back in to the motherboard?

Tell us about what it is physically.
(It may be electrically dead!)

Can you get a replacement ethernet card / port?
Can you make Wi-Fi work on this computer? (Buy a cheap USB Wi-Fi dongle?)

Last edited by ___; 02-16-2024 at 02:42 PM.
 
  


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