| Martin Cracauer via plug on 25 Apr 2022 09:07:23 -0700 |
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| Re: [PLUG] Kubuntu 22.04 loses network connectivity spontaneously |
I would recommend running this in the background (as root):
if="eth0" # set this
while : ; do
echo
date
ethtool "$if"
mii-tool "$if"
netstat -nr
tail /var/log/messages
sleep 7
done >> /var/tmp/mylog.$$
K.S. Bhaskar via plug wrote on Mon, Apr 25, 2022 at 11:19:45AM -0400:
> No luck with fiddling with the power saving settings: it still randomly
> drops the network connection. This has to be one of the most puzzling
> issues I have encountered.
>
> Thanks for the suggestions, all.
>
> Regards
> - Bhaskar
>
> On Sat, Apr 23, 2022 at 6:09 AM K.S. Bhaskar <ksbhaskar@gmail.com> wrote:
>
> > Thanks, that's a good thought. I'll check it when I'm back in the office
> > next week.
> >
> > Regards
> > - Bhaskar
> >
> > On Sat, Apr 23, 2022 at 5:29 AM Joe Rosato <rosatoj@gmail.com> wrote:
> >
> >> Looks like I'm late to the party but figured I throw a thought in...
> >> Could it be power saving settings? I read this pretty quickly but didn't
> >> see that mentioned...
> >>
> >> Joe
> >>
> >> On Fri, Apr 22, 2022, 9:45 PM K.S. Bhaskar via plug <
> >> plug@lists.phillylinux.org> wrote:
> >>
> >>> Here's how it played out.
> >>>
> >>> dmesg was not helpful. It merely recorded that the NIC was down, and
> >>> that some time later it was up. At least it told us that Linux knew the NIC
> >>> was down.
> >>>
> >>> I tried JP's ugly hack, having it run once a minute. No luck. When it
> >>> went down, it stayed down until it decided to come up, for reasons known
> >>> only to itself.
> >>>
> >>> Debugging it by logging in at the console was no help, because the
> >>> moment anyone logged in, moved a mouse or did something at the console, the
> >>> network came back to life. It did not go down when I was logged in at the
> >>> console (that's not to say that it would; just that it didn't on those
> >>> occasions when I was logged in to see whether I could be logged in when it
> >>> went down).
> >>>
> >>> As I installed Kubuntu into a different partition from the prior Arch
> >>> Linux, which was untouched by the Kubuntu installation, I reverted to Arch
> >>> Linux and that's what it's running for the weekend. Since the Arch has not
> >>> lost the network for several hours (vs. 20-30 minutes for Kubuntu), I'm
> >>> confident that it's not a hardware problem.
> >>>
> >>> All in all, it has been a very frustrating day.
> >>>
> >>> Regards
> >>> ??? Bhaskar
> >>>
> >>> On Fri, Apr 22, 2022 at 7:02 PM Rich Mingin (PLUG) via plug <
> >>> plug@lists.phillylinux.org> wrote:
> >>>
> >>>> What nic? If it was a universal issue it would have been reported
> >>>> plenty by now. More likely a device specific bug.
> >>>>
> >>>>
> >>>> On Fri, Apr 22, 2022 at 3:52 PM JP Vossen via plug <
> >>>> plug@lists.phillylinux.org> wrote:
> >>>>
> >>>>> On 4/22/22 15:25, K.S. Bhaskar via plug 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. ...
> >>>>> Really ugly hack?
> >>>>> ```
> >>>>> */5 * * * * root /bin/ping -c2 10.10.10.10 > /dev/null || { echo
> >>>>> 'Resetting eth0!' ; /sbin/ifconfig eth0 down ; /sbin/ifconfig eth0 up ; ip
> >>>>> route add default via 10.10.10.10 dev eth0 ; }
> >>>>>
> >>>>> ```
> >>>>>
> >>>>> Where 10.10.10.10 is the node's default gateway, and "eth0" is the
> >>>>> buggy interface. That's from when I had a box with a wonky USB Ethernet
> >>>>> adapter. It didn't fix the problem, and it didn't always work, but...it
> >>>>> worked sometimes.
> >>>>>
> >>>>> Much better to find and fix the root cause, of course, but maybe this
> >>>>> is a help until then, and might allow more data collection to find the
> >>>>> problem.
> >>>>>
> >>>>> Later,
> >>>>> JP
> >>>>> -- -------------------------------------------------------------------
> >>>>> JP Vossen, CISSP | http://www.jpsdomain.org/ |
> >>>>> http://bashcookbook.com/
> >>>>>
> >>>>> ___________________________________________________________________________
> >>>>> Philadelphia Linux Users Group --
> >>>>> http://www.phillylinux.org
> >>>>> Announcements -
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> >>>>> http://lists.phillylinux.org/mailman/listinfo/plug
> >>>>>
> >>>>
> >>>> ___________________________________________________________________________
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> >>>> Announcements -
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> >>>>
> >>>
> >>> ___________________________________________________________________________
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> >>> http://www.phillylinux.org
> >>> Announcements -
> >>> http://lists.phillylinux.org/mailman/listinfo/plug-announce
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> >>>
> >>
> ___________________________________________________________________________
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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
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug