综合应用libnet和libpcap的简单例程，其功能是在接收到一个来自特定主机的ARP请求报文之后，发出ARP回应报文，通知该主机请求的IP地址对应的MAC地址.该程序利用了libpcap在数据链路层抓包，利用了libnet向数据链路层发包-Integrated application libnet and libpcap simple routines, its function is to receive a request from a particular host s ARP pac