| http://www.w3.org/ns/prov#value | - The method according to claim 3, further comprising the steps of: if the data packet is a data packet based on a Transmission Control Protocol (TCP), determining whether the filtered data packet, obtained immediately after the primaryfiltering has been performed, is a SYN packet or an ACK packet, storing the SYN packet or the ACK packet, extracting only a SYN packet or an ACK packet, having the IP
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