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 [email protected] <mailto:[email protected]>
cid:[email protected]
*From:*Adam Armstrong <[email protected]>
*Sent:* Tuesday, August 22, 2023 12:14 PM
*To:* Observium <[email protected]>; Tony Guadagno via
observium <[email protected]>
*Cc:* Observium Network Observation System <[email protected]>;
Tony Guadagno <[email protected]>
*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 [email protected] <mailto:[email protected]>
cid:[email protected]
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