Like every 8 days my mini-computer loses cabled network connection (see original post for details). It happened again today. Plugging the pc<->switch cable to another plug on the switch didn't change anything. I shot down the pc, unplugged pc and switch from the wall (electricity) and left it more than an hour. After boot the problem was still there, none of the cameras could be pinged. I additionally connected my laptop to the switch, leaving all other connections as is. As I used the mini-pc as a replacement for the laptop for the purpose of the cameras I copied the fixed IP-setting. Both machines thus have eth0 configured as xxx.xx.0.1. Ifconfig on the laptop told me that the laptop confirmed that it has the same IP as the mini-pc! I thought that such as misconfiguration should not run or lead to problems, but no: I could ping the cameras from the laptop. And then, immediately, I could also ping them again from the mini-pc. Why can the laptop ping the cameras, and after he does, suddenly the mini-pc can, too? But no other means to make the eth0 connection work again. For me this is very strange. Anybody can find an explanation and a hint to a way how I could solve the problem? Thanks for your time! Daniel (I then changed the fixed IP on the laptop to xxx.xx.0.2 so that I could ping or ssh to the mini-pc. It works) Am 02.07.23 um 14:06 schrieb Daniel Bauer:
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?
-- Daniel Bauer photographer Basel Málaga https://www.patreon.com/danielbauer https://www.daniel-bauer.com