fastping.go
func NewPinger() *Pinger {
	rand.Seed(time.Now().UnixNano())
	return &Pinger{
		id:      rand.Intn(0xffff),
		seq:     rand.Intn(0xffff),
		addrs:   make(map[string]*net.IPAddr),
		network: "ip",
		source:  "",
		source6: "",
		hasIPv4: false,
		hasIPv6: false,
		Size:    TimeSliceLength,
		MaxRTT:  time.Second,
		OnRecv:  nil,
		OnIdle:  nil,
		Debug:   false,
	}
}
func NewPinger() *Pinger {
	rand.Seed(time.Now().UnixNano())
	return &Pinger{
		id:      rand.Intn(0xffff),
		seq:     rand.Intn(0xffff),
		addrs:   make(map[string]*net.IPAddr),
		network: "ip",
		source:  "",
		source6: "",
		hasIPv4: false,
		hasIPv6: false,
		Size:    TimeSliceLength,
		MaxRTT:  time.Second,
		OnRecv:  nil,
		OnIdle:  nil,
		Debug:   false,
	}
}
// NewPinger returns a new Pinger struct pointer