Since at&t recently announced monthly bandwidth caps, I figured I would try to setup something to monitor my monthly bandwidth. Preferably I would like to monitor at the pppoe interface, or possibly my dhcp server interface. I haven't found a way to do this. I already have queues setup for all the devices in house with sticky statics. I would use the queue to monitor the bandwidth, but they seem wrong sometimes, and I am going through a wireless AP so I dunno how much overhead that adds. So, what I am looking for is a way to measure inbound and outbound traffic on 1 interface of my router for a period of time. Thanks!
edit: all systems behind the router are either windows or devices like iPod, blu-ray player, etc. I do have access to an Ubuntu Linux vps so I could set something up in Linux if it could be done remotely.