PRTG Traffic Grapher is a free software for network monitoring  and also classifying bandwidth usage. This program  completely free for personal and commercial use and may be downloaded for free. PRTG Traffic Grapher is designed to run on a Windows machine in your network for 24 hours every day, and constantly records the network usage parameters.

features of “PRTG Paessler Router Traffic Grapher”:

· Reliable network monitoring used by more than 100.000 users every day
· Supports data acquisition via SNMP, packet sniffing or Netflow protocol
· Classifies network traffic by IP address, protocol and other parameters
· Works with most switches, routers, firewalls, and other network devices
· Easy installation with a few clicks on Windows 2000/XP/2003
· Monitoring engine is capable of monitoring up to several thousand sensors
· A Freeware Edition is available for smaller networks and SOHOs

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