能够侦听所有进出本主机的数据包完整显示数据包头信息和内容 MAC层支持：以太帧 网络层支持：IP，ARP，RARP，ICMP 传输层支持：TCP，UDP-Listening to all incoming and outgoing packets of the integrity of the host header information and display data content to support the MAC layer: network layer support for E