Is there any way to see connections between local devices? (specifically a wifi2ghz to a wifi5ghz?)

[ERamseth2]

I fear the answer is no, but I will ask... Is there any way to see if a device is connecting via LAN to another device on LAN (versus, say, out to the internet and back?, which I guess would end up being a loopback on the WAN interface?) - Oh and also I can't access netstat on the devices (not-rooted android phone and some camera without any sort of shell login).

Basically, I have some cameras and other devices (I guess they're all "IoT" devices) that I am unsure if they get connected to locally or via the internet. I guess I can just block internet access and see if they still work. But it still brought this question to my mind.

 

[ColinTaylor]

Not really, as you said you really need access to netstat on the clients.

The only thing that I can think of as you're specifically interested in traffic moving between WiFi interfaces is to use ebtables. It's not a very reliable method though. For example, to try and track connections from a device at 192.168.1.20:

ebtables -t broute -I BROUTING -p IPv4 --ip-src 192.168.1.20 --log-ip --log-prefix "EBTABLES"