捕获数据包，对FTP协议进行解析，分析出用户名和密码。
Capture packets, the FTP protocol parsing, analysis the user name and password.
tcpdump将持续地捕获数据包，直到您键入Ctrl + c为止。
Tcpdump continues to capture packets until you hit Ctrl + c.
分析和实验结果表明，此系统可以较为及时地捕获数据包，并能对过滤出的数据包做出正确的分析。
The final analysis and experimental results show that this system can be timely capture data packets and filter out them, then make the right analysis.
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