network connection often lost

[william drescher]

On 10/10/2016 9:38 AM, Lentes, Bernd wrote:
> Hi,
>
> i have two ubuntu boxes: 16.04.1 LTS and 12.04.2 LTS.
> Both are loosing network from time to time. I can't access them anymore, even ping to them does not work. Existing ssh connections are gone.
> If i go the boxes, login locally and ping any host (no matter which), it takes some seconds, then the ICMP replies come.
> And from that moment on they are accessible from other hosts. Just to the next loss.
...
>
> Box boxes are situated in different parts of the building and are not connected to the same switch. So i exclude the switch
> as a reason. One box i connected already to another port, no success. Both are physical host, no vm's.
>
> I have a bunch of suse boxes which don't have that problem, so i think it's related to ubuntu. Maybe power management ?
>
> Thanks.
>
>
> Bernd
>
>
I recently had a similar problem.  Without any notice the whole 
network would go down.  It turned out to be a switch that was 
flooding the network with trash.
Once I isolated it, the fix was fast and cheap.
-bill