IP FRAGMENT PACKET PROCESSOR, AND IP FRAGMENT PACKET PROCESSING METHOD AND PROGRAM TO BE USED IN THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an IP fragment packet processor capable of reducing memory cost and lowering a deterioration in performance.

SOLUTION: An IP fragment packet processing part 2 buffers a non-head fragment packet until receiving a head fragment packet including layer 4 header information and transmits the buffered fragment packet with the head fragment packet as a head. A packet analyzing part 1 registers fragment identification information in an associative storage memory 4 in the case of a head fragment packet and stores the layer 4 header information in a cache memory 5 corresponding to registration information to the associative storage memory 4. The packet analyzing part 1 retrieves the associative storage memory 4 with the packet identification information, reads the layer 4 header information from the cache memory 5 corresponding to the retrieval result and overwrites the layer 4 header information in a high-speed small capacity memory 3 in the case of an intermediate or final fragment packet.

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