I'm curious to see what information I'm blasting out to the various services I depend on for internet (ISP, DNS, probably Cloudflare, etc.).
Are there any easy to setup, entirely self-hosted tools I can run on my home network that would allow me to snoop on my own traffic.
I want more than just DNS, so I'm not just looking for pihole and its ilk. I want to see things like SNI and any non-protected traffic that any of the devices on my network might be sending that I just don't know about.
Ideally, it would be something I could leave on without affecting my speed/latency, but something to turn on occasionally and spot check would be better than nothing.
My router runs VyOS, so I should have quite a bit of flexibility in what I do with my traffic, though I never have figured out if/how to deploy custom software to it…
Oh, this the exact use case for a tool that I’m writing right now! It’s a daemon that runs on the gateway and acts as a DNS + DHCP + Firewall to monitor the activity of IoT devices.
https://github.com/mafik/gatekeeper
In the 1.6 (expected next weekend) I’m adding traffic graphs for each device and remote domain that it talks to.