摘要:
The traffic load density measuring system includes a transmitter connected to a communication network for transmitting a packet, and a receiver for receiving the packet, in which a packet for load density detection is transmitted and received to measure a traffic load density within a predetermined transmission interval. The transmitter changes a transmission interval of the packet for load density detection, and adds transmission information capable of specifying a transmission time, a transmission interval, and a transmission number of the packet for load density detection to the packet for load density detection to transmit said packet. The receiver receives the packet for load density detection, extracts the transmission information from the packet for load density detection being received, and measures the load density within the predetermined transmission interval based on the extracted transmission information, and a delay or a lost status of the packet for load density detection.
摘要:
A computer-readable recording medium recording a program capable of accurately analyzing the cause of a performance fault at the very end point of a client system, server system, etc. Outgoing and incoming packets are captured during execution of a communication application to measure a round trip time, and a communication window size of the transmitting source is estimated based on the captured incoming packets. A throughput estimate is calculated from the round trip time and the communication window size, and the estimated value and actual measured value of the throughput are displayed on, for example, a display, together with various other communication parameters including the communication window size and the round trip time, whereby the cause of a performance fault can be accurately located by quantitative analysis.
摘要:
A method of measuring packet loss rate and device thereof, includes intermittently capturing packets during a session, counting a capture success number indicating a number of the packets captured in every period of a time for capturing the packets, and a capturable number indicating a possible number of the packets to be captured during the period of time without loss, calculating a loss rate indicating a rate of losing the packets, according to the capture success number and the capturable number for every period of time and correcting the loss rate, by the measuring device, so that the loss rate gets larger accordingly as average of capturable numbers of respective periods of time is smaller.
摘要:
A system including a first apparatus including a first processor, a first storage device, and a first communication interface and a second apparatus including a second processor and a second communication interface is provided. The first processor measures traffic of data communicated via a predetermined communication path in each of a plurality of time ranges, stores the data communicated in each of the plurality of time ranges in the first storage device, and performs a control processing to cause the first communication interface to transmit the measured data traffic to the second apparatus, and when the second processor receives the measured data, the second processor performs control processing to cause the second communication interface to transmit to the first apparatus designation information designating one of the plurality of time ranges in which protection target data not to be deleted from the first storage device has been communicated.
摘要:
A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets includes: capturing packets in a specific session; storing the captured packets in a storage; screening the stored packets to count up a receipt count of voice packets; determining whether packet loss has occurred in the specific session; and determining whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred.
摘要:
A loss determining unit of a monitoring device calculates a receiving-time interval between a receiving time of data and the receiving time of immediately previous data. If the interval is a predetermined threshold or higher, the loss determining unit determines that “a loss is detected” and calculates the number of losses. If the number of losses is lower than the threshold, the loss determining unit determines that “no loss is detected”. A failure-section determining unit calculates the number of losses occurring in a first section. The failure-section determining unit calculates the number of losses occurring in a second section. If the loss is detected in the first section, the failure-section determining unit determines that a failure occurs in the first section. If the loss is detected in the second section, the failure-section determining unit determines that a failure occurs in the second section.
摘要:
A failure-section determining device includes a loss determining unit that calculates a receiving-time interval using a receiving time of data and a receiving time of immediately previous data, determines that a loss occurs when the receiving-time interval is a predetermined threshold or higher, and calculates the number of losses using the receiving-time interval and a data sending-time interval; and a determining unit that calculates the number of losses occurring in a first section between a sending device and a relay device, using a serial number of the received packet and a serial number of an immediately previous packet, and calculates the number of losses occurring in a second section between the relay device and a monitoring device, using the number of losses calculated by the loss determining unit and the number of losses occurring in the first section.
摘要:
When simulating communication using a communication network such as a VoIP network, an actual communication state is accurately simulated, and communication is simulated. The distribution of delay times of packets is transformed by a predetermined transformation method, packet transmission timings to which delay times are added, are calculated based on the transformed distribution of delay times and predetermined transmission timings, a determination is made as to whether or not the packet transmission order is changed by the calculated transmission timings to which delay times are added, and, when a determination is made that the packet transmission order is changed, packet transmission timings adjusted so as not to cause a change in the transmission order are derived.
摘要:
The present invention enables accurate simulation of the state of communication over a communication network in which a communication channel of different communication characteristic is set for each protocol and session, such as a VoIP network built in a multi-vendor environment, and evaluation of communication quality of communications between IP phones, etc. over a supposed communication network. A relay device for relaying packet communications between a plurality of communication devices is used, and the relay device sets a virtual processing unit as an initial process so that it corresponds to the packet transmission direction and/or attribute, based on the contents of a received packet specified by a control protocol, and relays communications of packets after the initial process, based on the packet loss rate and delay time distribution indicated by communication state information associated with the processing unit.
摘要:
The traffic load density measuring system includes a transmitter connected to a communication network for transmitting a packet, and a receiver for receiving the packet, in which a packet for load density detection is transmitted and received to measure a traffic load density within a predetermined transmission interval. The transmitter changes a transmission interval of the packet for load density detection, and adds transmission information capable of specifying a transmission time, a transmission interval, and a transmission number of the packet for load density detection to the packet for load density detection to transmit said packet. The receiver receives the packet for load density detection, extracts the transmission information from the packet for load density detection being received, and measures the load density within the predetermined transmission interval based on the extracted transmission information, and a delay or a lost status of the packet for load density detection.