Patent ID: 7197014

Claim:
A computer-readable medium having stored thereon a program for causing a computer to analyze a cause of a performance fault occurring on a network, the computer-readable medium having the program stored thereon comprising: packet capture means for capturing outgoing and incoming packets during execution of a communication application; round trip time measurement means for measuring a round trip time; communication window size estimation means for estimating a communication window size of a transmitting source based on the captured incoming packets; throughput estimate calculation means for calculating an estimated value of throughput based on the communication window size and the round trip time; and analysis result presentation means for presenting the estimated value and actual measured value of the throughput, together with communication parameters including the communication window size and the round trip time, wherein said communication window size estimation means estimates the communication window size from a total data amount of the incoming packets received over a cumulative arrival time equal to the round trip time.