DU Meter is an app that will help to regulate the amount of traffic or data running through your system, without the need for expensive network administration software.

DU Meter is an app that will help to regulate the amount of traffic or data running through your system, without the need for expensive network administration software.
DU Meter is a free utility which includes an extensive logging facility, flexible events system, and it works with virtually all types of network connections including phone modems, DSL, cable modem, LAN and satellite. By using DU Meter, you can observe or anticipate unexpected changes and even receive alerts about dangerous or unexpected network activity. From a pretty basic app, DU Meter has now been updated to make it a pretty impressive package that incorporates a much improved graphical user interface and a new mini mode in which the program operates extremely discreetly.

In addition, the program now uses a real database engine, which allows for much more accurate and detailed alerts regarding unusual network activity. It should be noted that in Windows Vista, DU Meter is even more easily accessibly thanks to a sidebar gadget that unfortunately isn't available in other versions of Windows.
For basic network monitoring and prevention of unexpected internet loss or abnormal activity, DU Meter has it all.