Fujitsu Corporation

Shunsuke Kikuchi

Yuji Nomura

Takeshi Yasuie

Taichi Sugiyama

Hiroshi Yamamoto

Shinya Kano

Noriyuki Fukuyama

Hitoshi Ueno

Tetsuya Nishi

Masataka Sonoda

Yuji Imai

Miho Tanaka

A data transfer method includes: executing a process that stores sensor information including duplicate degrees and position information, the duplicate degrees indicating an amount of computers as transmission sources of inhibit signals received by the first computer; executing a process that transmits the inhibit signal including the duplicate degree in the sensor information to a computer that is present in a position to which direct communication via the short-distance radio communication is possible; executing a process that stores the duplicate degree in the inhibit signal, associates the duplicate degree with the transmission source of the inhibit signal, and increases the duplicate degree in the sensor information; and executing a process that transmits the position information in the sensor information to the management device in a case where the duplicate degree in the sensor information is higher than the duplicate degree associated with the transmission source of the inhibit signal.

Non-transitory computer-readable storage medium, data transfer device, and data transfer method

A method of transferring data executed by a data transfer device, the method includes receiving a plurality of first data and a plurality of second data, accumulating the received plurality of first data and the received plurality of second data respectively, sending, to a first node, the plurality of first data accumulated during a first period, and sending, to a second node, the plurality of second data accumulated during a second period, wherein, the first period is longer than the second period when a first data amount of the plurality of first data to be sent to the first node per unit time is greater than a second data amount of the plurality of second data to be sent to the second node per the unit time.

Method of transferring data, data transfer device and non-transitory computer-readable storage medium

A communication control device that controls a communication device configured to be coupled to a network using a first communication, and to be coupled to an information processing device using a second wireless communication, the communication control device includes a processor configured to store identification information of the communication device and connection information used for setting the second wireless communication, control the communication device to stop the second wireless communication when it is detected that the communication device exists within a wireless communication area of a wireless communication device coupled to the network, transmit, to the wireless communication device, the connection information associated with the identification information of the communication device, and control the wireless communication device to establish a new wireless connection with the information processing device using the connection information.

Communication control device and method

From an observed packet, the hop number, which is the number of nodes that the packet has passed through, and a bottleneck bandwidth, which is a bottleneck for transmitting the packet, are determined so as to detect loss failures. Thereby, the subnet that transmitted the observed packet is located as a node in a topology tree on the basis of the determined hop count and bottleneck bandwidth. When a loss failure, by which the packet is lost, is detected, subnets that are inappropriately arranged are extracted from the arrangement in the topology tree of the loss-failure-detected subnet, and the arrangement of the extracted subnets is modified in order to resolve the inappropriateness.

Apparatus and method for generating topology tree

An apparatus stores, in association with each of one or more services to be provided, a communication monitoring rule under which communication performed for providing the each of the one or more services is to be monitored. The apparatus communicates with another apparatus that is operable to run a virtual machine and run a virtual router relaying communication performed by the virtual machine. When a service to be provided by the virtual machine is selected from among the one or more services, the apparatus controls the virtual router to monitor communication performed by the virtual machine according to the communication monitoring rule associated with the selected service, by sending the communication monitoring rule to the virtual router.

Apparatus and method for monitoring communication performed by a virtual machine

Transfer destination of a packet originating from a virtual machine is controlled so as to allow a capture device arranged in a communication network to capture a packet that is transferred using a communication tunnel. A first server acquires a first packet originating from a source virtual machine being operated by the first server, encapsulates the first packet by adding source and destination addresses. The first server further adds a transfer-destination address to the encapsulated first packet to generate a second packet when the first packet is determined to be a target packet to be captured by the capture device. Then, the first server transmits the second packet including the transfer-destination address to the second server using the communication tunnel while the second packet including the first packet is transferred to the transfer-destination address.

Apparatus for controlling a transfer destination of a packet originating from a virtual machine

Measurement agents in a network failure detecting system each configure a group together with other measurement agents that receive a service from the same provision server, and form a link to create a tree structure with a predetermined measurement agent in the group at its top. The measurement agent then receives measurement results from the other measurement agents in the group, and narrows down candidates of a failure location based on the received measurement results. The measurement agent transmits the narrowed candidates of the failure location to a surveillance server or one of the other measurement agents. The surveillance server then receives the transmitted candidates of the failure location, and specifies the failure location based on the received candidates of the failure location.

Network failure detecting system, measurement agent, surveillance server, and network failure detecting method

A data conversion device includes a receiving unit that receives first data and second data, transmitting after a start of the first data, transmitted from the first device to the second device, a transmitting unit that transmits the received first data and second data to a third device, and a control unit that controls a time point of transmitting the second data from the transmitting unit to lengthen a time interval between transmission of the first data and second data from the transmitting unit than a first time interval between transmission of the first data from the transmitting unit and reception of response data to the first data by the receiving unit when the first time interval is longer than a time interval between the transmission of the first data and second data from the first device to the second device.

Data conversion device and data conversion method

An abnormality locating apparatus locates an abnormal location in a network. An abnormal location judging part judges a normality or abnormality of a link based on a normality or abnormality of an observation flow, by acquiring information of links through which each observation flow passes, from a network route information storage that stores passing route information of observation flows passing through the links. A diagnosis accuracy judging part judges that an accuracy of judging the normality or abnormality of a connecting link connected to a first node deteriorates, by acquiring links connected to each relay node as connecting links from a relay node connecting link information storage that stores connecting link information of each relay node, and judging that a relay node having all connecting links thereof that are abnormal is the first node having all observation flows passing therethrough that are abnormal.

Abnormality locating method and apparatus, and computer-readable storage medium

A CPU executes a process including determining a core node among plural relay nodes on a basis of route information, acquiring a first and a second packets flowing between a server and a terminal apparatus, the second packet being transmitted on a basis of the first packet, calculating a first delay time on a basis of the first and the second packets, the first delay time relating to packet transmission between the server and the terminal apparatus, transmitting a third packet to the core node, receiving a response to the third packet from the core node, calculating a second delay time on a basis of the third packet and the response, the second delay time being a delay time of the core node, and calculating a third delay time being a delay time of an end node on a basis of the first and the second delay times.

Delay time measurement apparatus, storage medium storing delay time measurement program and network system

A connection state estimating method includes: acquiring a network distance between respective devices in a communication network; assuming branch point candidates at which three devices extracted from the network are connected together; calculating the network distance between each of the assumed branch point candidates and each of the three devices; classifying all the branch point candidates assumed to be connected with one of the devices into groups on the basis of the network distance between the one device and each branch point candidate; calculating representative values of the network distances between each device and branch point candidates assumed to be connected with the device; and selecting a device from the devices assumed to be connected with one of the branch point candidates and the representative value relating to the selected device.

Connection state estimating device, connection state estimating method and storage medium

A packet reception portion receives packets of user traffic transferred on the network. The received packets are transferred to an address extraction portion via a distribution portion, and the transmission source address and destination address are extracted. Based on these addresses, a packet generation portion generates probe packets the transfer destination of which is the address destination. A packet transmission portion transmits the probe packets to the network. The transmitted probe packets are received as probe response packets by the packet reception portion. The probe response packets received by the packet reception portion are transferred to a result storage portion via the distribution portion. The result storage portion stores transmission source addresses included in the probe packets in a result storage DB.

Management device to investigate path states of network and network system

A network control apparatus for controlling devices in a predetermined area of a communication network includes a request-receiving unit for receiving a first route-setting request, a database for storing device information and topology information, a request-range-judging unit for forming a judgment as to whether or not the first route-setting request is relevant to any of the controlled devices, and a request-transmitting unit for transmitting the first route-setting request to an upper-level network control apparatus in the case of the request-range-judging unit's judgment outcome indicating that the first route-setting request is irrelevant to any of the controlled devices.

Growing community of inventors

Kawasaki, Japan

Shunsuke Kikuchi