捕获网络数据包，可以分析包长度，以太网类型，MAC源地址以及帧地址，同时可以分析上层协议，比较基础的网络编程，适合初学者学习参考-Capture network packets, you can analyze packet length, Ethernet type, MAC address and the source address of the frame, while the upper layer protocol analysis, comparison-based network