套接字操作因为目的主机关闭而失败返回。
A socket operation failed because the destination host was down.
目的主机的IP层将接收到的所有分片重装成一个完整的数据报。
The IP layer at the receiving host must accumulate these fragments to completely reconstitute the original datagram.
这里有四个实例，这个是源，这个代表源主机，这个代表sf1，这个代表sf2，这个代表目的主机。
Here I have four instances. Like, one is my source. This is my source, this is my SF1, this is my SF2, this is my destination.
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