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List:       opensuse
Subject:    Re: why did eth0 suddenly stop working?
From:       "Carlos E. R." <robin.listas () telefonica ! net>
Date:       2023-07-09 18:39:20
Message-ID: ed4b38c9-a2f9-5726-3557-c4aada48403a () telefonica ! net
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On 2023-07-02 14:06, Daniel Bauer wrote:
> I have some cameras connected with eth-cables to a switch and from there 
> to a computer (OS 15.5, using zoneminder for the cameras). It works.
> 
> But this morning I saw that tonight the connection to the cameras was 
> lost. I could ping the switch, but not the cameras. "arp -a" showed the 
> IP's of the cameras but with "[IP] at incomplete ...".
> 
> I checked all cables.
> I rebooted.
> I switched off/on electricity for computer/switch/cameras.
> I unplugged the switch's cable to the computer and plugged it again.
> 
> No change.
> 
> I plugged the eth cable to my laptop (that I used before for this task, 
> using OS 15.3) and all connections worked...
> 
> Plugged back the eth cable to the computer - and the connections work 
> again, all cameras pingable and visible. Magic.
> 
> There are no messages in var/log, only the zoneminder-log said "no 
> connection to..."
> 
> What happened here?

Your setup is, I think:


+-----------------------------------+
|    switch 8 mouths                |
|                                   |
+-----------------------------------+
   |      |      |       |       |
   |      |      |       |       |
mini    cam    cam    cam     router
pc       1      2      3


Normally, it all works.

When it fails:

  ping from mini pc to sw, works
  ping from mini pc to camera, fails
  ping to router?
  ping to laptop (tried)?


The SW has to be involved in the failure somehow. The culprit can not be 
your computer alone.


-- 
Cheers / Saludos,

		Carlos E. R.
		(from 15.4 x86_64 at Telcontar)


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