Here we have to filter these data to see which features more suitable to do data. We are looking for is illegal, unusual or suspicious data, in most cases, all reflect an attacker using this vulnerability, or they use special technology. The following are candidates for feature data: only the SYN and FIN flag set with the data packet, which is recognized as signs of malicious behavior. ACK flag not set, but with different values confirm the number of data packets, and normally should be 0. Source and destination ports are set to 21 packets, often associated with the FTP server. Port the same situation that are generally known as "reflexive", in addition to some particular individual, such as NetBIOS time communication, the
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