func generateIP() string {
        ipInt := rand.Uint32()
        p0 := (ipInt >> 24) & 0xff
        p1 := (ipInt >> 16) & 0xff
        p2 := (ipInt >> 8) & 0xff
        p3 := (ipInt >> 0) & 0xff
        return fmt.Sprintf("%d.%d.%d.%d", p0, p1, p2, p3)
}