DD wrt bandwidth usage by user

Is there anyway on the dd-wrt to check to see how much bandwidth each client is using? I ask because I am in charge of looking over a group of routers connecting to a dd-wrt router and if a user is using too much at certain times I would like to be able to see that, and i am not all that familiar with dd-wrt.

Assuming you want a bit of long term visibility to diagnose who is using a lot of bandwidth over time, DD-WRT has this cool feature called rFlow which can send data to a remote server that collects it. The server choice is up to you, but I'm personnally a big fan of nTop.

This blog post raves about the amount of visibility this can give you. Let me know if this is not what you were asking for.

smoothwall seems to have the ability to do this as long as it's passing over one of it's interfaces. dd-wrt seems to be able to do a general overview but not by user. A cisco 2950 may be able to tell you per port utilization.