网络延时是向目的地发送请求到目的地实际接收到数据包之间的时间间隔。
The network latency is the time between sending a request to a destination and the destination actually receiving the sent packet.
使用Linux时，需要利用iptables(参阅参考文献)来定义对传入数据包的响应策略，是接收、丢弃还是拒绝。
When you use Linux, you need iptables (see Resources) to define a policy of responding to an incoming packet by accepting, dropping, or rejecting it.
所有用户需要做的是编写(或安装，或使用)一个程序发送数据包到两个不同的目的地，并接收对方发来的数据包。
All that user needs to do is write (or install, or use) a program that sends packets to two different destinations and receives from both of them.
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