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raspberrypi / linux

Kernel source tree for Raspberry Pi-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at https://forums.raspberrypi.com/
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Raspberry PI OS (Debian) not responding to connections inside LAN after some time. #4585

Open fearek opened 3 years ago

fearek commented 3 years ago

After running RPI OS for some time, it will stop responding to any machines inside LAN, ping, ssh, FTP, VNC, ... Internet connection works normally and you can still access the machine through external IP if you have redirected ports

To reproduce: run RPI OS (Debian) for some time, sometimes its hours sometimes its days, its random.

Expected behaviour It should respond to all requests from LAN too

Actual behaviour It doesnt respond to any requests from LAN, other devices see it as down

System Copy and paste the results of the raspinfo command in to this section. Alternatively, copy and paste a pastebin link, or add answers to the following questions:

Additional context Heard it happens on pi 4 with ethernet too, so it's not bound to WiFi

fearek commented 3 years ago

Pinned down the issue to RPI not responding to ARP requests, after some time other devices ARP table is invalid sudo arping -c 1 -I wlan0 -A rpiaddresshere fixes it temporairly

DanLacz commented 2 years ago

Suffering from the same problem but arping command gives timeout. Pi is able to access internet, and can be connected to externally, reliably. A local nmap scan states "Host seems down", but the Pi is visible on the router admin panel. Pi does not respond to any LAN requests whatsoever, such as SSH.

Model is 3B V1.2

root@x:/home/pi# cat /etc/rpi-issue Raspberry Pi reference 2021-05-07 Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, dcfd74d7d1fa293065ac6d565711e9ff891fe2b8, stage2

root@x:/home/pi# vcgencmd version Dec 1 2021 15:07:06 Copyright (c) 2012 Broadcom version 71bd3109023a0c8575585ba87cbb374d2eeb038f (clean) (release) (start)

root@x:/home/pi# uname -a Linux x 5.10.63-v7+ #1496 SMP Wed Dec 1 15:58:11 GMT 2021 armv7l GNU/Linux

Edit: On Windows, adding the Pi to the arp table seems to temporarily restore communication (but not always) arp -s (Pi IP Address) (Pi Mac Address) arp -d ping (Pi IP Address)