在项目中，我们需要知道哪些IP是可用IP，这时候想到了用ICMP（Internet控制报文协议）。可以使用开源库–github.com/sparrc/go-ping来判断是否能ping通。

使用–github.com/sparrc/go-ping开源库判断是否能ping通的代码：

func ServerPing(target string) bool  {pinger, err := ping.NewPinger(target)if err != nil {panic(err)}pinger.Count = ICMPCOUNTpinger.Timeout = time.Duration(PINGTIME*time.Millisecond)pinger.SetPrivileged(true)pinger.Run()// blocks until finishedstats := pinger.Statistics()fmt.Println(stats)// 有回包，就是说明IP是可用的if stats.PacketsRecv >= 1 {return true}return false}

这里是通过回包数量来判断的，也可以通过掉包率来判断。同时，该库提供了Statistics结构体，包含了详细的ICMP信息，如下

type Statistics struct {// PacketsRecv is the number of packets received.PacketsRecv int// PacketsSent is the number of packets sent.PacketsSent int// PacketLoss is the percentage of packets lost.PacketLoss float64// IPAddr is the address of the host being pinged.IPAddr *net.IPAddr// Addr is the string address of the host being pinged.Addr string// Rtts is all of the round-trip times sent via this pinger.Rtts []time.Duration// MinRtt is the minimum round-trip time sent via this pinger.MinRtt time.Duration// MaxRtt is the maximum round-trip time sent via this pinger.MaxRtt time.Duration// AvgRtt is the average round-trip time sent via this pinger.AvgRtt time.Duration// StdDevRtt is the standard deviation of the round-trip times sent via// this pinger.StdDevRtt time.Duration}

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