Balena devices on the same network cannot ping each other

[tgirotto]

Hello, I am currently facing a networking problem with two RPI 3b+ devices running balena OS version 2.46.1. They are showing up in the balena cloud console and working fine while connected to the same wifi network. One has address 192.168.0.102 and the other has address 192.168.0.105, but cannot ping each other. I have tried both at Host OS and Container level, but all tests give me an empty result. Am I missing something?

The one below is my routing table, and the gateway is 192.168.0.1

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    600    0        0 wlan0
10.114.101.0    *               255.255.255.0   U     0      0        0 balena0
10.114.102.0    *               255.255.255.0   U     0      0        0 resin-dns
10.114.104.0    *               255.255.255.128 U     0      0        0 supervisor0
52.4.252.97     *               255.255.255.255 UH    0      0        0 resin-vpn
172.17.0.0      *               255.255.0.0     U     0      0        0 br-7fe66c81aa13
192.168.0.0     *               255.255.255.0   U     600    0        0 wlan0

[majorz]

Hi @tgirotto, are you able to ping remote locations like www.google.com? Also on the dashboard you will find a Diagnostics tab - can you please run the device health checks there and let us know if you see any issues reported?

Thanks,
Zahari

[majorz]

Also what does cat /proc/sys/net/ipv4/icmp_echo_ignore_all returns when running from the host OS? This is to check whether ping packets are not disabled from the kernel.

[tgirotto]

@majorz I have figured out the problem, and it’s not related to balena. My AP was isolating all hosts. Once I disabled isolation, everything started working again. Thanks for the support!

[gelbal]

Nice to hear that you figured out the problem : )