摘要 |
This invention is to prevent the network traffic at the fault from increasing. As for this invention, if a packet is received from an access server 3 , an accounting server 13 a of a transfer destination is specified from a user ID included in the packet data, and then the packet based on the packet data is transmitted to the accounting server 13 a of the transfer destination. If a response is not received from the accounting server 13 a of the transfer destination in a predetermined period, the packet data is stored into a proxy reply list, and also a response corresponding to the packet data is generated and is transmitted to the access server 3 . Then, the packet data stored in the proxy reply list is read out at a predetermined timing and the accounting server 13 a of the transfer destination is specified from the user ID included in the packet data, and the packet based on the read packet data is transmitted to the accounting server 13 a of the transfer destination. If a response is received from the accounting server 13 a of the transfer destination in the predetermined period, the response and the packet data in the proxy reply list are discarded.
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