Netdata Community

Interface package drops when connecting a device to wlan

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#1

Environment

I’m running the latest netdata agent on my proxmox node and on all vm’s.
For my wireless network I’m using UniFi access points. The UniFi Cloud Key runs in a Docker container within a VM virtualized by said hypervisor.

Problem/Question

Every time I connect a device to my wireless network, all VMs drop packets and netdata triggers an alarm. How can I analyze this further?

What I expected to happen

I want to know what is causing this alarm because it is really annoying and I want to fix it. Netdata unfortunately does not show me any hint which package exactly is being dropped. I know this may not be the right place to ask this question, but I have no idea who else to ask.

#2

Hey @Lamera and welcome to our community!

Your use-case seems very interesting, using that many Netdata Agents. Have you tried Netdata Cloud?

Now, in terms of your question, although I personally don’t have any experience, I found a relevant thread in our GitHub, where various users discussed in regards to packets being dropped and how to detect this. Please do tell me if you find it useful.

#3

Hi @OdysLam :smiley:

Thanks for your reply.
Finally, I found the packet that is causing this false alarm (see picture below). Thanks to this issue in github.
With ebtables -A INPUT -p 890d -j DROP on the proxmox hypervisor, the alarm is gone on this node. But all virtual machines still get this alarm.
And also this hotfix is not permanent. After a reboot the alarm is back again.
I think the only thing I can do now is configure this alert different on the netdata agent.

grafik
grafik1278×900 140 KB

#4

Hi. Try to add same rule in the FORWARD table.

It is possible to save current ebtables configuration to a file.

sudo ebtables-save > /etc/ebtables.conf

So you can restore it during the system startup (for example using rc.local)

ebtables-restore < /etc/ebtables.conf

#5

same problem happened to me with netdata on openmediavault