Patent ID: 7440409

Claim:
A traffic monitoring system which monitors network traffic in an IP network in which an IP packet is transmitted according to a service class which is classified based on Diffserv protocol, comprising: a monitor unit which monitors the IP packet on the IP network; a detection unit which detects a service class which is classified based on Diffserv protocol, a source IP address, and a destination IP address of the IP packet, wherein the detection unit determines, from the detected IP addresses, a source sub network address and a destination sub network address; a classify unit which classifies traffic information based on the detected information; and a monitor manager which performs statistical process on the traffic information accumulated by the accumulate unit for displaying the traffic information, monitoring abnormal status in the network, or capturing trend in the network; and an accumulate unit which accumulates the classified traffic information for each service class and/or for each sub network address, wherein the detection unit uses a net mask to determine the sub network addresses, and the monitor manager supplies the net mask to the detection unit.