Abstract: A communication apparatus calculates information about a position of the communication apparatus based on a GPS radio wave and registers the calculated information about the position as an installation position of the communication apparatus when a measured strength of the GPS radio wave is equal to or stronger than a predetermined strength, when the measured strength of the GPS radio wave is equal to or stronger than the predetermined strength, periodically calculates the information about the position of the communication apparatus based on the GPS radio wave or the like, uses the calculated information of the position as a current position of the communication apparatus, compares the current position of the communication apparatus with the registered installation position of the communication apparatus.

Abstract: A communication apparatus calculates information about a position of the communication apparatus based on a GPS radio wave and registers the calculated information about the position as an installation position of the communication apparatus when a measured strength of the GPS radio wave is equal to or stronger than a predetermined strength, when the measured strength of the GPS radio wave is equal to or stronger than the predetermined strength, periodically calculates the information about the position of the communication apparatus based on the GPS radio wave or the like, uses the calculated information of the position as a current position of the communication apparatus, compares the current position of the communication apparatus with the registered installation position of the communication apparatus.

Abstract: In order to allow a DPI device to determine whether a protocol library needs to be updated, this packet analysis device is provided with: a protocol library that stores one or more characteristics of a packet to be inspected; an inspection unit that detects whether the characteristic is included in inputted packets on the basis of the contents of the protocol library; a counting unit that counts, for each characteristic in a predetermined time period, the number of traffics of inputted packets from which the characteristics are detected and the number of traffics of inputted packets from which the characteristics are not detected; and an analyzer that determines whether an update of the protocol library is necessary or not on the basis of the counting result by the counting unit, and downloads a later protocol library from a download server when the update is necessary.

Abstract: The present invention provides a load distribution system and a load distribution method that are capable of selecting an appropriate server in consideration of a load condition of a server and characteristic of a mobile node. Provided is a load distribution system 1 in a communication network that includes a mobile node 2, a plurality of home agent servers 90 that manage positional information of the mobile node 2, and an authentication server 4 that performs access authentication of the mobile node 2.