Patent ID: 8966060
Filing Date: 2015-02-24
Classification: H04L

Abstract:
1. A determination apparatus comprising: a storage unit to store source configuration information for determining a source of a reply packet, wherein the source configuration information includes at least one of a uniform resource identifier, a file extension, a content type, and a reply code indicating a reply content; and a processor coupled to a memory, the memory storing a computer program comprising instructions, wherein the instructions are executed by the processor to: acquire through a communication network a request packet transmitted from a client device to a server device group or the reply packet transmitted from the server device group to the client device, the server device group including a first server device and one or more second server devices, the first server device being connected to the client device through the communication network; upon acquiring a request packet, register information of the request packet in a database, storing a source address, a destination address, a request data and a reception time of the request packet; upon acquiring a reply packet, register information of the reply packet in the database, by retrieving a corresponding request packet information item from the database based on a source and a destination of the reply packet, and adding a reception time, reply data and size information of the reply packet to the retrieved item; compare the registered information of the reply packet with the source configuration information to determine whether a source of the reply packet is the first server device or one of the second server devices; and when no corresponding reply packet is acquired for a predetermined time period from the reception time of the request packet, record in a corresponding database item that the server device group has provided no reply.