ping的原理就是首先建立通道，然后发送包，对方接受后返回信息，这个包至少包括以下内容，发送的时候，包的内容包括对方的ip地址和自己的地址，还有序列数，回送的时候包括双方地址，还有时间等，主要是接受方在都是在操作系统内核里做好的，时刻在监听，提供一段c程序的代码，希望对大家有用。-ping is to first establish the principle of access, and then send packets, the other party accepted the return of information, this package includes the following elements, at least, send time, the contents of packets, including each other' s ip address and her address, as well as sequence number, time of return include both addresses, and so still have time, mainly in the recipient are in good operating system kernel, and always listening, providing for some c code, I hope useful for all of us.