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List: opensuse
Subject: Re: why did eth0 suddenly stop working? Again and very strange! [and 1 more messages]
From: Daniel Bauer <linux () daniel-bauer ! com>
Date: 2023-07-10 8:45:30
Message-ID: 70241a12-3c50-11a5-c2e0-b8495e601b42 () daniel-bauer ! com
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Am 10.07.23 um 08:33 schrieb Bob Rogers:
> From: Daniel Bauer <linux@daniel-bauer.com>
> Date: Sun, 9 Jul 2023 13:00:39 +0200
>
> Just the same as described in my first post happened again tonight:
>
> Suddenly (like after approx. 100 of running normal) the connections on
> eth0 tpo the IP's behind the switch get lost. I can ping the switch, but
> not the other IP's connected to that switch.
>
> ...
>
> BUT: plugging the the switch to my laptop all IP's are available on the
> laptop immediately, then plugging back the cable to the PC they appear
> there as well...
>
> ...
>
> The only think I can think of that would cause this behavior is that
> somehow the switch is being fooled into thinking that the Ethernet
> address for that port has changed when in fact it hasn't. (That should
> only explain failure to receive packets, but depending on the nature of
> the failure, it might screw up sending as well.)
What could make the switch being fooled - after 7 days working uptime?
> Plugging in another
> system forces the switch to reconsider, which fixes the problem.
Ok, that explains to me why plugging it into the laptop makes a change.
> And if
> attempting to make connections from your PC fails, then it's not
> surprising that unplugging/replugging doesn't help either. This also
> goes a long way to proving that it's not your PC's fault.
>
> Have you tried permuting the connections to the switch? (And sorry
> if this has already been suggested.)
Sorry for my lack of English... With "permuting the connections to the
switch" you mean plugging the cable into another port/plug of the switch?
Actually I haven't tried this.
> ...
> How long did you leave it unplugged? Small switches don't need much
> power, so if they have an even halfway decent power supply, they can
> remember routing information for a surprisingly long time, perhaps a few
> minutes even. Or there may even be an NVRAM cache for routing info.
Only some seconds, maybe half a minute...
--
Daniel Bauer photographer Basel Málaga
https://www.patreon.com/danielbauer
https://www.daniel-bauer.com
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