可以监听本地网段（同个路由器内的网段）指定IP的IP数据包.

原理是ARP欺骗的方法，欺骗了目标IP的机器的ARP缓存以及本地路由器内的ARP表，让路由器跟目标IP之间的数据都必须经过运行这个软件的机器。

因为涉及到数据链路层的数据包操作，需要JPCAP这个包来增加JAVA对数据链路层的支持，所以要运行这个软件除了虚拟机还需要安装winpcap(windows)/libpcap(linux)＋JPCAP才能运行。-Can monitor the local network segment (with a router within the network segment) Specify the IP packet IP. The principle of ARP spoofing is to deceive the target IP of the machine as well as local router ARP cache of ARP table, Let the router with the IP data between the target must be running the software of the machine. Because of the data link layer packets, you need to JPCAP the JAVA package to increase the data link layer support, so apart from the software to run virtual machines also need to install winpcap (windows)/libpcap (linux)　 JPCAP to run .