diff --git a/cmd/cmd.go b/cmd/cmd.go
index 6496ed2b..b32c7322 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -34,7 +34,7 @@ func Excute() {
 		"method (incremented by each probe, default is 33434), or initial seq for \"icmp\" (incremented as well, default from 1), or some constant" +
 		"destination port for other methods (with default of 80 for \"tcp\", 53 for \"udp\", etc.)"})
 	numMeasurements := parser.Int("q", "queries", &argparse.Options{Default: 3, Help: "Set the number of probes per each hop"})
-	parallelRequests := parser.Int("", "parallel-requests", &argparse.Options{Default: 18, Help: "Set ParallelRequests number. It should be 1 when there is a multi-routing."})
+	parallelRequests := parser.Int("", "parallel-requests", &argparse.Options{Default: 18, Help: "Set ParallelRequests number. It should be 1 when there is a multi-routing"})
 	maxHops := parser.Int("m", "max-hops", &argparse.Options{Default: 30, Help: "Set the max number of hops (max TTL to be reached)"})
 	dataOrigin := parser.Selector("d", "data-provider", []string{"IP.SB", "IPInfo", "IPInsight", "IPAPI.com"}, &argparse.Options{Default: "LeoMoeAPI",
 		Help: "Choose IP Geograph Data Provider [LeoMoeAPI,IP.SB, IPInfo, IPInsight, IPAPI.com]"})
@@ -49,6 +49,8 @@ func Excute() {
 	src_addr := parser.String("s", "source", &argparse.Options{Help: "Use source src_addr for outgoing packets"})
 	src_dev := parser.String("D", "dev", &argparse.Options{Help: "Use the following Network Devices as the source address in outgoing packets"})
 	router := parser.Flag("R", "route", &argparse.Options{Help: "Show Routing Table [Provided By BGP.Tools]"})
+	packet_interval := parser.Int("z", "send-time", &argparse.Options{Default: 0, Help: "Set the time interval for sending every packet. Useful when some routers use rate-limit for ICMP messages."})
+	ttl_interval := parser.Int("i", "ttl-time", &argparse.Options{Default: 500, Help: "Set the time interval for sending packets groups by TTL. Useful when some routers use rate-limit for ICMP messages."})
 	str := parser.StringPositional(&argparse.Options{Help: "IP Address or domain name"})
 
 	err := parser.Parse(os.Args)
@@ -58,7 +60,7 @@ func Excute() {
 		fmt.Print(parser.Usage(err))
 		return
 	}
-
+	printer.Version()
 	if *ver {
 		printer.CopyRight()
 		os.Exit(0)
@@ -66,6 +68,10 @@ func Excute() {
 
 	domain := *str
 
+	if *port == 0 {
+		*port = 80
+	}
+
 	if *fast_trace {
 		fastTrace.FastTest(*tcp, *output)
 		if *output {
@@ -139,6 +145,8 @@ func Excute() {
 		DestIP:           ip,
 		DestPort:         *port,
 		MaxHops:          *maxHops,
+		PacketInterval:   *packet_interval,
+		TTLInterval:      *ttl_interval,
 		NumMeasurements:  *numMeasurements,
 		ParallelRequests: *parallelRequests,
 		RDns:             !*noRdns,
diff --git a/printer/realtime_printer.go b/printer/realtime_printer.go
index 64497837..f0a1f98e 100644
--- a/printer/realtime_printer.go
+++ b/printer/realtime_printer.go
@@ -79,8 +79,7 @@ func RealtimePrinter(res *trace.Result, ttl int) {
 			}
 			fmt.Fprintf(color.Output, " %s", color.New(color.FgHiGreen, color.Bold).Sprintf("%-16s", whoisFormat[0]))
 		}
-
-		if res.Hops[ttl][i].Geo.Country == "" {
+		if len(res.Hops[ttl][i].Geo.Country) <= 1 {
 			res.Hops[ttl][i].Geo.Country = "LAN Address"
 		}
 
diff --git a/trace/icmp_ipv4.go b/trace/icmp_ipv4.go
index 8b683493..efccd06d 100644
--- a/trace/icmp_ipv4.go
+++ b/trace/icmp_ipv4.go
@@ -47,7 +47,7 @@ func (t *ICMPTracer) PrintFunc() {
 				}
 			}
 		}
-		<-time.After(100 * time.Millisecond)
+		<-time.After(200 * time.Millisecond)
 	}
 }
 
@@ -84,8 +84,9 @@ func (t *ICMPTracer) Execute() (*Result, error) {
 		for i := 0; i < t.NumMeasurements; i++ {
 			t.wg.Add(1)
 			go t.send(ttl)
+			<-time.After(time.Millisecond * time.Duration(t.Config.PacketInterval))
 		}
-		<-time.After(time.Millisecond * 100)
+		<-time.After(time.Millisecond * time.Duration(t.Config.TTLInterval))
 	}
 
 	t.wg.Wait()
diff --git a/trace/icmp_ipv6.go b/trace/icmp_ipv6.go
index 3e0ee2ea..ebe1e2f0 100644
--- a/trace/icmp_ipv6.go
+++ b/trace/icmp_ipv6.go
@@ -48,7 +48,7 @@ func (t *ICMPTracerv6) PrintFunc() {
 			}
 		}
 
-		<-time.After(100 * time.Millisecond)
+		<-time.After(200 * time.Millisecond)
 	}
 }
 
@@ -85,8 +85,9 @@ func (t *ICMPTracerv6) Execute() (*Result, error) {
 		for i := 0; i < t.NumMeasurements; i++ {
 			t.wg.Add(1)
 			go t.send(ttl)
+			<-time.After(time.Millisecond * time.Duration(t.Config.PacketInterval))
 		}
-		<-time.After(time.Millisecond * 100)
+		<-time.After(time.Millisecond * time.Duration(t.Config.TTLInterval))
 	}
 	// for ttl := t.BeginHop; ttl <= t.MaxHops; ttl++ {
 	// 	if t.final != -1 && ttl > t.final {
diff --git a/trace/tcp_ipv4.go b/trace/tcp_ipv4.go
index 709649a7..fdf1af88 100644
--- a/trace/tcp_ipv4.go
+++ b/trace/tcp_ipv4.go
@@ -90,7 +90,7 @@ func (t *TCPTracer) Execute() (*Result, error) {
 		if t.AsyncPrinter != nil {
 			for {
 				t.AsyncPrinter(&t.res)
-				time.Sleep(50 * time.Millisecond)
+				time.Sleep(200 * time.Millisecond)
 			}
 		}
 
diff --git a/trace/trace.go b/trace/trace.go
index fa557dc7..05caf508 100644
--- a/trace/trace.go
+++ b/trace/trace.go
@@ -27,6 +27,8 @@ type Config struct {
 	Quic             bool
 	IPGeoSource      ipgeo.Source
 	RDns             bool
+	PacketInterval   int
+	TTLInterval      int
 	RealtimePrinter  func(res *Result, ttl int)
 	AsyncPrinter     func(res *Result)
 }
diff --git a/trace/udp.go b/trace/udp.go
index bd9454bc..7e1d5caf 100644
--- a/trace/udp.go
+++ b/trace/udp.go
@@ -73,7 +73,7 @@ func (t *UDPTracer) Execute() (*Result, error) {
 		if t.AsyncPrinter != nil {
 			for {
 				t.AsyncPrinter(&t.res)
-				time.Sleep(50 * time.Millisecond)
+				time.Sleep(200 * time.Millisecond)
 			}
 		}
 	}()