此程序可以发现网络中的主机，检测某一给定IP是否被启用，若存在此IP，可以获取该IP对应的MAC地址，该程序实现的功能类似于PING，用ARP协议来探测网内主机。-This program can be found in the host network to detect whether a given IP is enabled, if the existence of this IP, you can get the IP corresponding to the MAC address,