PACKET CAPTURING DEVICE
First Claim
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1. A packet capturing device comprising:
- an acquisition unit that acquires an ID value and a sequence number written on a header of a received packet;
a storage unit that stores a previous ID value which is an ID value of a previously-received packet and a next sequence number which is a sequence number that a next packet to be received should have; and
a detection unit that judges whether a delay of the received packet is caused by a simple delay or a retransmission accompanying a loss,wherein the detection unitcompares the next sequence number with a sequence number of the received packet,compares the previous ID value with an ID value of the received packet, andjudges that the delay is a simple delay when the next sequence number matches the sequence number of the received packet and the previous ID value is followed by the ID value of the received packet or judges that the delay is caused by a retransmission when the previous ID value is not followed by the ID value of the received packet.
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Abstract
A next sequence number, which is a sequence number that a next packet should have, is compared with the sequence number of a current packet, an identifier of a previous packet is compared with the identifier of the current packet, and a delay is judged to be a simple delay when the next sequence number matches the sequence number of the current packet and the identifier of the previous packet is followed by the identifier of the current packet. Or the delay is judged to be caused by a retransmission when the identifier of the previous packet is not followed by the identifier of the current packet.
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Citations
4 Claims
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1. A packet capturing device comprising:
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an acquisition unit that acquires an ID value and a sequence number written on a header of a received packet; a storage unit that stores a previous ID value which is an ID value of a previously-received packet and a next sequence number which is a sequence number that a next packet to be received should have; and a detection unit that judges whether a delay of the received packet is caused by a simple delay or a retransmission accompanying a loss, wherein the detection unit compares the next sequence number with a sequence number of the received packet, compares the previous ID value with an ID value of the received packet, and judges that the delay is a simple delay when the next sequence number matches the sequence number of the received packet and the previous ID value is followed by the ID value of the received packet or judges that the delay is caused by a retransmission when the previous ID value is not followed by the ID value of the received packet. - View Dependent Claims (2, 3, 4)
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Specification