Fujitsu Corporation

Hirokazu Iwakura

Yuji Nomura

Sumiyo Okada

Fumiyuki Iizuka

Naoyoshi Ohkawa

Yasuhiko Kanemasa

Masazumi Matsubara

Ken Yokoyama

Toshihiro Shimizu

Atsushi Kubota

Junichi Higuchi

Tatsuya Morita

Masao Otsuka

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.

Packet analysis program, packet analyzing apparatus, and packet analysis method for estimating wireless quality according to a packet analysis

A disclosed information processing apparatus includes a memory and a processor. And the processor is coupled to the memory and configured to: detect a first virtual node that is a bottleneck from among plural virtual nodes included in a virtual system; and identify a second virtual node that is a bottleneck based on a first number of cache misses that occurred when a first program for realizing the first virtual node was executed and a second number of cache misses that occurred when a second program for realizing a second virtual node that is other than the first virtual node was executed.

Analysis method and analysis apparatus

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.

Method and apparatus for analyzing communication quality, and non-transitory computer-readable storage medium

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.

Method and apparatus for packet analysis

A method includes: recording information on a transmission source and a transmission destination in a received packet into first information; generating a copied packet by copying the received packet, the information of which is recorded in the first information, the first information being to be referred to when whether to generate a copied packet is determined based on a received packet; transmitting the generated copied packet to an analyzer device; receiving the copied packet; when it is determined that a predetermined condition is satisfied for the copied packet, transmitting instruction information for the copied packet to a first relay device among relay devices being a transmission source of the copied packet; and in response to reception of the instruction information, deleting, from the first information, the information on the transmission source and the transmission destination of the received packet used in the copying.

Method, and network system

A method includes: extracting a partial character string including a reserved word and a character string immediately previous or subsequent to the reserved word from each of a plurality of pieces of target data, the plurality of pieces of target data conforming to a first pattern character string including the reserved word defined by a protocol; detecting target data including the partial character string among the plurality of pieces of target data; specifying a first partial character string from the extracted partial character string based on the detected target data; and creating, by a processor, a second pattern character string for classifying the plurality of pieces of target data based on the first pattern character string and the first partial character string.

Method of creating classification pattern, apparatus, and recording medium

A determination method executed by a processor included in a device configured to receive a plurality of copied packets, the determination method includes receiving a first copied packet that is a copy of a first packet including an identifier and session information; determining that the first copied packet is a duplicate packet when information of the identifier is stored in a memory; storing the information of the identifier in the memory when the information of the identifier is not stored in the memory; and deleting the information of the identifier stored in the memory when a second copied packet that is a copy of a second packet that includes session information indicating a session that is the same as a session indicated by the session information included in the first packet, a communication direction of the second packet being opposite to a communication direction of the first packet, is received.

Determination method, device and storage medium

A port switching method performed by a processor included in an analysis device coupled to a first port and a second port which are included in at least one of a plurality of switches, the port switching method includes receiving a first copy packet from the first port; determining whether the first copy packet succeeded a second copy packet based on sequence information of the first copy packet, and based on sequence information of a second copy packet received before the receiving; specifying a target port outputted the first copy packet to the first port, the target port being included in a target switch among the plurality of switches when it is determined that the first copy packet did not succeed the second copy packet; and causing the target switch to transmit, from the target port, a third copy packet generated at the target switch to the second port.

Port switching method, analysis device, and recording medium

A system analysis apparatus includes a message reconstruction module which reconstructs observed data and data of which the observation has failed, into messages regarding a request and a response which are communicated on a system. The apparatus includes a message candidate extraction module which compares message rules with the reconstructed messages, and extracts messages in the message rules which are identical to the reconstructed messages, from the messages defined in the message rules, as message candidates. The apparatus includes a call relationship extraction module which extracts a call relationship between the message candidates. The apparatus includes a matching module which compares transaction models in which processes in units of transactions on the system have been modeled on the basis of call relationships among the processes on the system, with the extracted call relationship, and selects and determines a transaction model identical to the call relationship.

Recording medium storing system analysis program, system analysis apparatus and system analysis method

A packet identification device has a reception unit that successively receives packets. The device has an obtaining unit that obtains, every time a packet is received, an interval of reception times between the received packet and a packet received immediately before the received packet, in the same connection as that of the received packet. The device has an identification unit that identifies the received packet as a packet containing a forefront segment of a plurality of segments constituting one message when the obtained reception time interval is higher than a predetermined threshold value.

Computer-readable recording medium storing packet identification program, packet identification method, and packet identification device

A method of hunting for a communication channel in a communication system where a plurality of communication lines each have a plurality of communication channels includes the steps of maintaining a record of current channel statuses of the communication channels with respect to all the communication lines, and distributing busy channels evenly among the communication lines by selecting a communication channel based on the record of channel statuses and assigning the selected communication channel to a call.

Method and device for hunting for communication channel

For each of a plurality of signal processors accommodating respective shares of signalling links to be controlled by a signalling point, a congestion-condition level is determined by comparing an overload condition of a central controller and the number of processed signals with their respective threshold values. Any signalling link, whose priority is lower than the priority corresponding to the determined congestion-condition level, is inhibited for use, and a signalling link accommodated in another signal processor is substituted for the inhibited signalling link. In determining the congestion-condition level, a decision is made at predetermined intervals of time as to whether the condition is a congested condition or a congestion cleared condition; if it is a congested condition, the congestion-condition level is raised, and if it is a congestion cleared condition, the congestion-condition level is lowered.

Growing community of inventors

Adachi, Japan

Hirokazu Iwakura