software to manage wrtdd router

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I wanted to manage the logs for network usage on the wrtdd router like rflow or something of that nature.
I looked in portage and found some packages but cannot figure out how to launch them let alone use them so I wanted to know if anyone has any experience or recommendations for a good package to use.

I see theres a lot of cool programs the do it for windows but would think there should be even better ones for linux.

I hope there are or I will be forced to use my wifeys laptop and she wont be a fan of it lol.
Also a little more info is that my goal is to know how much bandwidth each IP or mac is using and what not.
SNMP traffic is what its monitoring for those unfamiliar with wrtdd.

Thanks

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trying to use wireshark....... cannot get it to show me anything like eth0 or wl0
its just blank so if someone has experience with it that would help