Re: [PLUG] Kubuntu 22.04 loses network connectivity spontaneously

[Martin Cracauer via plug <plug@lists.phillylinux.org>]

Things to do:
- look at `dmesg`
- without making the network work again, log in via the monitor.  See
  whether the computer tried to go to sleep
- likewise, while the network is down, see whether there is a dhclient
  on the network interface

Martin

K.S. Bhaskar via plug wrote on Fri, Apr 22, 2022 at 03:28:07PM -0400: 
> The mouse and monitor had nothing to do with it. It just lost the network
> again. Now to try some other hypothesis???
> 
> Regards
> ??? Bhaskar
> 
> On Fri, Apr 22, 2022 at 3:25 PM K.S. Bhaskar <ksbhaskar@gmail.com> wrote:
> 
> > I did a fresh install of Kubuntu 22.04 this morning and a bizarre behavior
> > has me scratching my head. As the machine (a 2017 PC, high end at the time)
> > is used primarily as a server, and occasionally as a desktop, most of the
> > time the monitor is powered down and the wireless mouse is turned off to
> > conserve the battery. Every so often, it loses its network connection. I
> > was watching it from my laptop with a watch ping -c3 xyz , and caught it
> > in the act (machine names and IP address edited):
> >
> > Every 2.0s: ping -c3 xyz
> >                mylaptop: Fri Apr 22 14:33:21 2022
> >
> > PING xyz(xyz.mydomain.local (<IPv6 address>) 56 data bytes
> > 64 bytes from xyz.mydomain.local (<IPv6 address>): icmp_seq=1 ttl=64
> > time=0.279 ms
> >
> > --- xyz ping statistics ---
> > 3 packets transmitted, 1 received, 66.6667% packet loss, time 2026ms
> > rtt min/avg/max/mdev = 0.279/0.279/0.279/0.000 ms
> >
> > It loses both its IPv4 address and IPv6 address, and then when we do
> > anything with it, like disconnect and reconnect the network cable, the
> > network comes to life again. We swapped Ethernet cables and the network
> > switch port, and that made no difference. I suppose it could be the network
> > card, but that has been rock solid for the last five years, and until this
> > morning, the machine was running Arch Linux robustly without any hiccups.
> >
> > I currently have the monitor and mouse powered on in case that has
> > something to do with it.
> >
> > I have two machines which I upgraded from 20.04 to 22.04 (one two weeks
> > ago, and one this afternoon). Both are rock solid with no hiccups. It's
> > only this one with a fresh install.
> >
> > Any help is greatly appreciated. This is truly bizarre. Thanks in advance.
> >
> > Regards
> > ??? Bhaskar
> >

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-- 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Martin Cracauer <cracauer@cons.org>   http://www.cons.org/cracauer/
___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
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