Keep a close watch over your network and bandwidth usage with PRTG - Paessler Router Traffic Grapher.
    Optimize the efficiency of your network with regular monitior over your network and bandwidth useage. A very useful tool for the network administrator provides live readings and long-term usage trends for their network devices. The useful tool is supported with the SNMP, packet sniffing and netflow protocol. The capable tool is compatible with all switches, routers, firewalls, as well as many other network devices. The vigilant monitor works round the clock and records the network usage parameters. The in-built web server can easily access graphs and tables using any web browser. Moreover, the tool provides free Paessler SNMP Helper to machines running on Windows 2000, XP or 2003.
    Avoid bandwidth and server performance bottlenecks, trace area with more bandwidth use, get excellent service, and reduced costs in buying bandwidth.