Patent ID: 8817632

Claim:
A method of measuring packet loss rate, comprising: intermittently capturing packets during a period of time of a session including at least one capturing time for capturing the packets and a non-capturing time, by a measuring device; counting a capture success number indicating a number of the packets captured in every capturing time of the period of time, and a capturable number indicating a possible number of packets to be captured by the measuring device during capturing times of the period of time without loss; calculating a loss rate indicating a ratio of all loss of packets according to the capture success number and the capturable number for every period of time, by the measuring device; and correcting the loss rate, using the measuring device, to have a larger value accordingly as an average of the capturable number of packets of said every period of time becomes smaller, wherein the captured packets correspond to first packets, and the method further comprising: simulating flowing of second packets which are virtual packets through a virtual network so that the second packets are lost at a second loss rate, by a simulator; simulating capturing of the second packets several times while changing a consecutively captured number indicating a number of the packets consecutively captured and the second loss rate, by the simulator; counting a second capturable number indicating a number of the second packets which are to be captured without loss when consecutively capturing the packets with the consecutively captured number and which are simulated so that the packets are lost at the second loss rate, for every combination of the consecutively captured number and the second loss rate, by the simulator; calculating a third loss rate indicating a rate of losing the second packets in a combination, according to the second capturable number corresponding to the combination of the consecutively captured number and the second loss rate and the same consecutively captured number, by the simulator; and storing loss rate relating data indicating the third loss rate corresponding to the combination, the consecutively captured number forming the same combination, and the second loss rate forming the same combination, into a storing unit, by the simulator, and wherein the loss rate is corrected to the second loss rate which corresponds to the third loss rate most approximate to the loss rate and to the consecutively captured packet number most approximate to the average.