
fairusagepfft
If you use your internet connection from a single device, then using something like Networx might be okay, but since you mention you are using a WiFi router, I guess you are using the connection from multiple devices, and you have to track your usage for all those devices. Best thing is to track it from your router. See if your router is compatible with dd-wrt at dd-wrt.com. Or maybe your router already has a bandwidth usage tracking solution built in.