1.捕获原始数据包。不管这个包是发往本地机，还是其他机器之间的交换包。

2.在数据包被发送到应用程序之前，通过用户定义的规则过滤。

3.向网络发送原始数据包。

4.对网络通信量做出统计。

-1. Capture raw packets. Whether the package is sent to the local machine, or other machines exchange between packages.

2. Before the packets are sent to the application, through a user defined rules to filter.

3. Send the original data to the network.

4. On network traffic statistics.