Abstract: The process includes acquiring, from a relay device that relays a packet between a first communication device and a second communication device, a plurality of first delay times generated by a round trip of the packet between the first communication device and the relay device, and a plurality of second delay times generated by a round trip of the packet between the second communication device and the relay device, sorting separately the plurality of first delay times and the plurality of second delay times based on a length of a delay time, and calculating device delay times based on a first delay calculation that calculates a difference between each of the plurality of first delay times and each of the plurality of second delay times in a same rank after the sorting.

Abstract: The process includes acquiring, from a relay device that relays a packet between a first communication device and a second communication device, a plurality of first delay times generated by a round trip of the packet between the first communication device and the relay device, and a plurality of second delay times generated by a round trip of the packet between the second communication device and the relay device, sorting separately the plurality of first delay times and the plurality of second delay times based on a length of a delay time, and calculating device delay times based on a first delay calculation that calculates a difference between each of the plurality of first delay times and each of the plurality of second delay times in a same rank after the sorting.

Abstract: An information processing apparatus includes a processor that acquires first and second packet groups at a predetermined location in a network. The first and second packet groups are wirelessly transmitted from first and second wireless communication devices, respectively, and received by one of a plurality of wireless base stations connected to the network. The processor accumulates the first packet group and the second packet group in a memory in an arrival order. The processor detects a consecutive number of packets in which a first packet among the first packet group and a second packet among the second packet group are accumulated alternately and consecutively one packet at a time in a time series. The processor determines whether the first and second wireless communication devices are connected to a same wireless base station based on the consecutive number.

Abstract: A non-transitory computer-readable storage medium storing therein a packet analysis program for causing a computer to execute a process comprising detecting, from a plurality of received ACK packets, a successive ACK packet group including a plurality of ACK packets for which each reception interval is smaller than a first reference value and in which a round-trip time of each ACK packet becomes shorter in order of reception, and estimating wireless quality based on the number of ACK packets constituting the successive ACK packet group.

Abstract: An information processing apparatus includes a processor that acquires first and second packet groups at a predetermined location in a network. The first and second packet groups are wirelessly transmitted from first and second wireless communication devices, respectively, and received by one of a plurality of wireless base stations connected to the network. The processor accumulates the first packet group and the second packet group in a memory in an arrival order. The processor detects a consecutive number of packets in which a first packet among the first packet group and a second packet among the second packet group are accumulated alternately and consecutively one packet at a time in a time series. The processor determines whether the first and second wireless communication devices are connected to a same wireless base station based on the consecutive number.

Abstract: A method for analyzing communication qualities between virtual machines serving as transmission sources and virtual machines serving as transmission destinations on a virtual network includes identifying, by a computer, based on the temporal sequence of the input queue information and the temporal sequence of the output queue information, a first pair and a second pair as mirroring targets, wherein the input queue information indicates a first queue length indicating a number of pieces of data addressed from one of the transmission sources to one of the transmission destinations, wherein the output queue information indicates a second queue length indicating a number of pieces of data included in an output queue of the one of the transmission destinations.

Abstract: A computer obtains a first packet group transmitted wirelessly by a first wireless communication apparatus and a second packet group transmitted wirelessly by a second wireless communication apparatus. The computer then detects a first non-communication period, during which there are no packets transmitted by the first wireless communication apparatus for a prescribed time or longer, and also detects a second non-communication period, during which there are no packets transmitted by the second wireless communication apparatus for the prescribed time or longer. The computer then determines based on an overlap between the first and second non-communication periods whether the first and second wireless communication apparatuses are connected to the same wireless base station.

Abstract: A non-transitory computer-readable storage medium storing therein a packet analysis program for causing a computer to execute a process comprising detecting, from a plurality of received ACK packets, a successive ACK packet group including a plurality of ACK packets for which each reception interval is smaller than a first reference value and in which a round-trip time of each ACK packet becomes shorter in order of reception, and estimating wireless quality based on the number of ACK packets constituting the successive ACK packet group.

Abstract: A packet analysis method includes acquiring a first acknowledge packet and a second acknowledge packet transmitted from the first device; acquiring a plurality of packets transmitted from the second device during a period from reception of the first acknowledge packet to reception of the second acknowledge packet; identifying a number of packets corresponds to data transmitted from the second device, by calculating a difference between a first identification number corresponding to the first acknowledge packet and a second identification number corresponding to the second acknowledge packet; calculating a plurality of bandwidth values, a number of the plurality of bandwidth values is identical to the number of packets, based on acquisition timings of the plurality of packets and an interval between the acquisition timings of two adjacent packets; and determining a bandwidth value that is to be removed from the plurality of bandwidth values by comparing the plurality of bandwidth values.

Abstract: A throughput measuring method includes: acquiring a plurality of data packets at an observation point on a network, the plurality of data packets being transmitted from a transmission source apparatus and received by a transmission destination apparatus; calculating a plurality of round trip times, for each of the data packets, from a time point of acquisition of each of the data packets transmitted from the transmission source apparatus to a time point of acquisition of response packet corresponding to each of the data packets; identifying a measurement time section including the plurality of calculated round trip times increasing in ascending order of identification numbers of the response packets; and calculating a throughput of the identified measurement time section based on data quantities of the plurality of data packets transmitted from the transmission source apparatus during the identified measurement time section.

Abstract: In an analysis apparatus, when detecting each packet communicated via a network, an update unit updates statistical information that is stored in a continuous storage area of a storage unit and that indicates the communication state of the network for a first cycle. Then, a first processing unit reads the statistical information from the storage unit at every first cycle, and processes the statistical information and initializes the statistical information in the storage unit. A second processing unit reads partial statistical information that is part of the statistical information from the storage unit at every second cycle shorter than the first cycle, and processes the partial statistical information and initializes the partial statistical information in the storage unit.

Abstract: An operation unit detects that a received first ACK packet is an ACK packet transmitted in response to a single data packet. The operation unit determines whether to calculate a round trip time by using reception time of the first ACK packet on the basis of a window size included in the first ACK packet and a window size included in a second ACK packet acquired immediately before the first ACK packet. If the operation unit determines to calculate the round trip time, the operation unit outputs the round trip time calculated by using the reception time of the first ACK packet.

Abstract: A computer obtains a first packet group transmitted wirelessly by a first wireless communication apparatus and a second packet group transmitted wirelessly by a second wireless communication apparatus. The computer then detects a first non-communication period, during which there are no packets transmitted by the first wireless communication apparatus for a prescribed time or longer, and also detects a second non-communication period, during which there are no packets transmitted by the second wireless communication apparatus for the prescribed time or longer. The computer then determines based on an overlap between the first and second non-communication periods whether the first and second wireless communication apparatuses are connected to the same wireless base station.

Abstract: An apparatus acquires time-series information that stores information on a packet transmitted and received between a first apparatus and a second apparatus in association with a time at which the packet is transmitted or received. The apparatus estimates a window size indicating an amount of data that a receiver of the data is able to accept without acknowledging a sender of the data, based on the acquired time-series information, and, based on temporal change in the estimated window size, determines a type of congestion control being executed by the first apparatus, from among a plurality of candidate types of congestion control.

Abstract: A method for analyzing communication qualities between virtual machines serving as transmission sources and virtual machines serving as transmission destinations on a virtual network includes identifying, by a computer, based on the temporal sequence of the input queue information and the temporal sequence of the output queue information, a first pair and a second pair as mirroring targets, wherein the input queue information indicates a first queue length indicating a number of pieces of data addressed from one of the transmission sources to one of the transmission destinations, wherein the output queue information indicates a second queue length indicating a number of pieces of data included in an output queue of the one of the transmission destinations.

Abstract: A storage unit stores a plurality of packets collected in a wired section. An operation unit classifies the plurality of packets stored in the storage unit for each connection. The operation unit determines packets corresponding to a connection having a period in which a total data amount of packets for each of which a confirmation response packet has not arrived from a destination apparatus among packets transmitted by an information processing apparatus connected to the wired section increases when the connection is started, a round-trip time of each of the packets transmitted by the information processing apparatus not increasing monotonically in the period, to be packets of communication including the wireless section.

Abstract: A packet analysis method includes acquiring a first acknowledge packet and a second acknowledge packet transmitted from the first device; acquiring a plurality of packets transmitted from the second device during a period from reception of the first acknowledge packet to reception of the second acknowledge packet; identifying a number of packets corresponds to data transmitted from the second device, by calculating a difference between a first identification number corresponding to the first acknowledge packet and a second identification number corresponding to the second acknowledge packet; calculating a plurality of bandwidth values, a number of the plurality of bandwidth values is identical to the number of packets, based on acquisition timings of the plurality of packets and an interval between the acquisition timings of two adjacent packets; and determining a bandwidth value that is to be removed from the plurality of bandwidth values by comparing the plurality of bandwidth values.

Abstract: A device is configured to specify a first time difference between a first time in which a first data packet is transmitted and a second time in which a first response packet is received, specify a second time difference between the second time and a third time in which a second response packet is received, the second response packet being a final response packet corresponding to second data packets transmitted after the first time and before the second time, specify a first data amount of the one or more second data packets, and a second data amount of the first data packet and the one or more second data packets, specify a first throughput value based on the second data amount and the first time difference, specify a second throughput value based on the first data amount and the second time difference.

Abstract: A packet analysis method includes acquiring a first acknowledge packet and a second acknowledge packet transmitted from the first device; acquiring a plurality of packets transmitted from the second device during a period from reception of the first acknowledge packet to reception of the second acknowledge packet; identifying a number of packets corresponds to data transmitted from the second device, by calculating a difference between a first identification number corresponding to the first acknowledge packet and a second identification number corresponding to the second acknowledge packet; calculating a plurality of bandwidth values, a number of the plurality of bandwidth values is identical to the number of packets, based on acquisition timings of the plurality of packets and an interval between the acquisition timings of two adjacent packets; and determining a bandwidth value that is to be removed from the plurality of bandwidth values by comparing the plurality of bandwidth values.

Abstract: An apparatus acquires a packet transmitted between a transmission-terminal and a reception-terminal, and stores the acquired packet in association with a time at which the packet has been acquired. When a first bandwidth of data packets transmitted by the transmission-terminal during a time-period from acquisition of a first ACK-packet transmitted by the reception-terminal to acquisition of a second ACK-packet transmitted by the reception-terminal subsequently to the first ACK-packet, is smaller than a second bandwidth or greater than a third bandwidth, the apparatus determines the second ACK-packet to be a packet not desired to measure a bandwidth, where the second bandwidth is calculated using an acquisition interval between first and second data packets transmitted respectively after waiting for the first and second ACK-packets, and the third bandwidth is calculated using an acquisition interval between two adjacent data packets including a data packet transmitted without waiting for an ACK-packet.