Am 09.07.23 um 20:39 schrieb Carlos E. R.:
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
Not sure anymore, I think the switch itself has no IP (?). What works is ping to eth0, with the fixed IP I defined in networkmanager.
ping from mini pc to camera, fails
yes
ping to router?
There is no router. Only Mini_PC to switch, switch to cameras. WiFi is turned off. No internet connection wanted.
ping to laptop (tried)?
Haven't tried. Need another cable. Will try while everything works to check the new cable, and then try again, when the error occurs the next time.
The SW has to be involved in the failure somehow. The culprit can not be your computer alone.
I posted on it's forum yesterday, with not a lot of hope, because actually I cannot imagine that a software could stop my network working, especially because it's the same on the laptop and on the PC. But well... -- Daniel Bauer photographer Basel Málaga https://www.patreon.com/danielbauer https://www.daniel-bauer.com