I don't know.
This is a connectivity issue. We fork snmpwalk, if it doesn't get data from the end machine, there's not a lot we can do about that, especially if it's bizarrely intermittent.
It seems like you're having ICMP *and* UDP traffic being dropped, which might make it easier to work out why.
You'd likely never notice this kind of connectivity issue if the connectivity wasn't being relied on by something like Observium, because humans tend to just ignore momentary things.
Is there a large backup operation or some other scheduled thing happening at that time that's saturating the link?
Thanks, adam.
Tony Guadagno via observium wrote on 22/08/2023 20:16:
Adam, I hear what you are saying about udp flooding…there are routers (no filters) in between but no firewalls. i don’t see any indication in the logs that there are udp flooding issues…also, why only every couple of months? Why not every night?
Tony Guadagno
O +1 585 577 1003
C +1 585 703 6700
E tonyg@guadagnoconsulting.com mailto:tonyg@guadagnoconsulting.com
cid:image001.jpg@01D84DD6.FC9912E0
*From:*Adam Armstrong adama@observium.org *Sent:* Tuesday, August 22, 2023 12:14 PM *To:* Observium observium@lists.observium.org; Tony Guadagno via observium observium@lists.observium.org *Cc:* Observium Network Observation System observium@observium.org; Tony Guadagno tonyg@guadagno.org *Subject:* Re: [Observium] my server freaks out sometimes!
This is likely a firewall or similar intervening device being unhappy at UDP volume and rate limiting.
It's likely that your discovery run starts at midnight, so increases SNMP UDP traffic.
adam.
Tony Guadagno via observium wrote on 22/08/2023 14:01:
·Hi, I am using the pro version Observium 23.8.12912 (stable) <https://www.observium.org/> I am having an issue where over the course of 2 hours (or so) all my devices go down and then up. It claims that it missed pings but there is no issue with any of the devices. This has happened to me 2 times in the past 3 months, both times starting at midnight. When I look in the event log, I am seeing some odd things on that date: First, notice that there are a bunch of snmp timeouts which do not occur on any other day. Also, it seems that all the devices have changes…again this does not happen on any other night. After the first incident I increased the RAM on the server thinking that it was constrained, but the poller info does not look bad: I would appreciate help in determining what to look at for the cause of this. Thanks Tony Guadagno O +1 585 577 1003 C +1 585 703 6700 E tonyg@guadagnoconsulting.com <mailto:tonyg@guadagnoconsulting.com> cid:image001.jpg@01D84DD6.FC9912E0 _______________________________________________ observium mailing list --observium@lists.observium.org <mailto:observium@lists.observium.org> To unsubscribe send an email toobservium-leave@lists.observium.org <mailto:observium-leave@lists.observium.org>
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