geffers wrote: ↑
Sat Jun 23, 2018 11:15 am
It has a fixed IP so is a separate device but am wondering; is there any way it can monitor network traffic from other devices on my network?
I've had a wee bit of experience with ntopng but think that shows traffic passing through that specific device.
That depends on what sort of thing you want to monitor.
For any detailed inspection the pi would need to see the traffic which would normally mean the traffic passing through the Pi. This might limit the throughput on your internet link. There are various tools to inspect traffic depending on what it is you want to look at.
On some switches/routers there's an option to get basic data (packets/bytes/errors on each interface) via a protocol called SNMP. This just uses an agent that could run on your Pi which runs on a regular basis to gather the data. This doesn't need all the traffic going via the Pi (so means it's not a bottleneck) but does require any the network equipment to support SNMP (some home routers do, other don't).