在Linux利用Libpcap实现的一个数据包捕获程序，能捕获TCP,UDP,ICMP等类型数据包。-Linux use in the realization of a Libpcap packet capture process can capture TCP, UDP, ICMP and other types of packets.

linux下udp方式实现广播包的发送、接受，并且不同网段都可以收到广播信息数据包。-udp way to send broadcast packets under linux, acceptance, and different segments can receive broadcast packets.