TCP/IP监视封包程序，本程序必须采root才能执行，在欲用linux监视与其它主机间通信封包的时后，请在执行ipdump之前，用ifconfig指令换成promiscuous方式。-TCP/IP packet monitoring procedures, the procedures must be taken root to run, want to use linux in surveillance and other communication between the host when the packet, please ipdump prior to the implementation and use ifconfig command into promiscuous mode.