Fping：一个多主机同时ping扫描程序
fping是一款相似ping（1）（ping（1）是通过ICMP（网络控制信息协议InternetControlMessageProtocol）协议回复恳求以检测主机是不是存在）的程序。Fping与ping不一样的当地在于，您可以在命令行中指定要ping的主机数量范围，也可以指定含有要ping的主机列表文件。与ping要等候某一主机连接超时或发回反馈信息不一样，fping给一个主机发送完数据包后，马上给下一个主机发送数据包，实现多主机一起ping。假如某一主机ping通，则此主机将被打上标记，并从等候列表中移除，假如没ping通，说明主机无法抵达，主机依然留在等候列表中，等候后续操作。(fping is a program similar to ping(1) (ping(1) replies to requests to detect the presence of a host via the ICMP (Internet Control Message Protocol) protocol). The difference between Fping and ping is that you can specify a range of the number of hosts to be pinged on the command line, or you can specify a file containing a list of hosts to be pinged. Unlike ping, which waits for a certain host to connect to timeout or send back feedback information, after fping sends a data packet to one host, it immediately sends a data packet to the next host to realize multi-host ping together. If a host is pinged, the host will be marked and removed from the waiting list. If it is not pinged, it means that the host cannot be reached, and the host remains in the waiting list, waiting for subsequent operations.)
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