Hello Hivemind 🙃
i need some advice here as i am losing my mind.
I have a Fritz!Box6591 and 1Gbit/s internet. Now since yesterday my complete network is extremely unstable. IF i can get any connection, it’s as fast as it should be. But connections break down within minutes.
If i let the network “rest” for a couple minutes with barely no activity, i can then access everything perfectly fine for a few minutes until everything breaks down again.
What i did:
-Deactivated my local DNS (AdGuard) on my router -Restarted (even with 15 min. of no power) EVERYTHING. Literally everything in my homenetwork.
Since it’s not only the internet connection and not one specific device and not even one specific type of connection (two WiFi Devices can’t properly connect between each other just as two different LAN Devices on either different Ports on the router or same router port on a switch) i don’t really know what to do anymore.
Obviously my router is the only common denominator but i can’t see any issues with it. It’s not overheating, it’s RAM & CPU usage is perfectly fine, it’s not gone it powersaving mode, it doesn’t throw me any errors.
I already did tracepath’s to every device and there is no unexpected hop on some theoretical phantom device (if my DNS became buggy or something).
If i ping one of my servers from my PC. It says i have a latency of 1~3ms but it is obviously hanging really hard. It could have a delay of 15 seconds before the next line in ping appears but that will still claim it had a 2ms latency.
I don’t know what to do anymore and where to begin. Any ideas?
EDIT: Here is quick sketch of my network
EDIT2: Found the culprit - https://lemmy.dbzer0.com/comment/324192
Alright - i found the culprit.
My Sonos speaker on switch 1 was kinda DDoS’ing me… apparently thats a know issue aswell. It flooded my network with requests and probably looped back on itself.
Well, now they are offline, my network is functional and as soon as i have time i will see what i can do about them. Probably factory reset.
What’s the uptime of your router? Is it or any subsystem crashing frequently under load?
The uptime now is basically a couple minutes as i just restarted it again-
There is no load on my systems at the moment.
Are you also using Powerline? This can cause all kinds of wanky issues.
no i am not.
And even if, two devices connected via WiFi on the Router (directly, not via mesh or access point) shouldn’t be disturbed by some wonky powerline should they?
Connect one device at a time and see if you can narrow it down.
I would try to do it systematically. At my dad’s we had a similar problem but not the same and there it was that my dad by accident created a loop in one of the switches.
I would start with turning off the wifi and disconnecting everything from the Fritzbox. Then I would connect a laptop with a ethernet cable to the fritzbox and check if this part works or if the Fritzbox is already broken.
My guess was gonna be a broadcast storm caused by a loop. Like a device that’s connected to 2 different ports. That or a rogue dhcp.
Either way, taking a capture in Wireshark would have helped.If these are managed switches, configuring bpdu guard on LAN ports (not on trunk ports to other switches!) would prevent a device from forming a loop.
