In the face of internet service providers like Comcast instituting bandwidth-capping, the Simple Help weblog details how to use a router running the open-source DD-WRT firmware to monitor your bandwidth. It’s actually very simple to do, requiring no work on your part aside from installing DD-WRT on your router. DD-WRT automatically tracks bandwidth, so from there it’s a matter of knowing where to look. If you’re running the user-friendly Tomato firmware (we also showed you how to install Tomato), you can easily access your daily, weekly, or monthly bandwidth as well.
Link: Lifehacker