Best way to set up network traffic monitoring

[uviteru]

So I have time capsule that I use for NAS and as an access point, connected to a router/modem provided by Comcast, which is my internet provider (comcast router is in bridge mode). I want to be able to monitor the traffic at the point of the time capsule (SNMP is not supported), so i'm looking at adding another router in between the modem/router and time capsule in order to capture network traffic. I'm considering using Tomato or DD-WRT, but I'm trying to find out if this would be the best setup, and how exactly to configure everything. Ideally, I would like the traffic router to be on the same subnet so that I can access it without having to change iPs or networks.

A little bit of noobie with this stuff, so any advice would be much appreciated.

Thanks!

 

[Nullity]

How detailed do you need the logs to be?

 

[uviteru]

Just the type of traffic, which device on the network was pulling the traffic, and the server(s) it was/is communicating with. Also i want to be able to view it realtime, not just the logs. Pretty much similar to what is available in tomato