diff --git a/mem/vm/protocol.go b/mem/vm/protocol.go
index 1d1bcec..42796e4 100644
--- a/mem/vm/protocol.go
+++ b/mem/vm/protocol.go
@@ -28,7 +28,12 @@ func (r *TranslationReq) Clone() sim.Msg {
 
 // GenerateRsp generates response to originral translation request
 func (r *TranslationReq) GenerateRsp(page Page) sim.Rsp {
-	rsp := TranslationRspBuilder{}.WithSrc(r.Dst).WithDst(r.Src).WithRspTo(r.ID).WithPage(page).Build()
+	rsp := TranslationRspBuilder{}.
+		WithSrc(r.Dst).
+		WithDst(r.Src).
+		WithRspTo(r.ID).
+		WithPage(page).
+		Build()
 
 	return rsp
 }
diff --git a/noc/standalone/agent.go b/noc/standalone/agent.go
index af32695..e0e9d65 100644
--- a/noc/standalone/agent.go
+++ b/noc/standalone/agent.go
@@ -20,7 +20,9 @@ func (m *TrafficMsg) Meta() *sim.MsgMeta {
 
 // Clone returns cloned TrafficMsg
 func (m *TrafficMsg) Clone() sim.Msg {
-	return m
+	clone_msg := NewTrafficMsg(m.Src, m.Dst, m.TrafficBytes)
+
+	return clone_msg
 }
 
 // NewTrafficMsg creates a new traffic message
diff --git a/sim/examples/ping/comp.go b/sim/examples/ping/comp.go
index b97ba9b..ee270a6 100644
--- a/sim/examples/ping/comp.go
+++ b/sim/examples/ping/comp.go
@@ -3,7 +3,6 @@ package ping
 import (
 	"fmt"
 	"reflect"
-	"strconv"
 
 	"github.com/sarchlab/akita/v4/sim"
 	"github.com/sarchlab/akita/v4/sim/directconnection"
@@ -25,6 +24,7 @@ func (p *PingMsg) Clone() sim.Msg {
 
 func (p *PingMsg) GenerateRsp() sim.Rsp {
 	rsp := &PingRsp{}
+	rsp.ID = sim.GetIDGenerator().Generate()
 
 	return rsp
 }
@@ -44,7 +44,7 @@ func (p *PingRsp) Clone() sim.Msg {
 }
 
 func (p *PingRsp) GetRspTo() string {
-	return strconv.Itoa(p.SeqID)
+	return p.ID
 }
 
 type StartPingEvent struct {
diff --git a/sim/examples/ticking_ping/comp.go b/sim/examples/ticking_ping/comp.go
index 98d9f3a..bfb54b0 100644
--- a/sim/examples/ticking_ping/comp.go
+++ b/sim/examples/ticking_ping/comp.go
@@ -2,7 +2,6 @@ package ticking_ping
 
 import (
 	"fmt"
-	"strconv"
 
 	"github.com/sarchlab/akita/v4/sim"
 	"github.com/sarchlab/akita/v4/sim/directconnection"
@@ -27,6 +26,7 @@ func (p *PingMsg) Clone() sim.Msg {
 
 func (p *PingRsp) GenerateRsp() sim.Rsp {
 	rsp := &PingRsp{}
+	rsp.ID = sim.GetIDGenerator().Generate()
 
 	return rsp
 }
@@ -49,7 +49,7 @@ func (p *PingRsp) Clone() sim.Msg {
 }
 
 func (p *PingRsp) GetRspTo() string {
-	return strconv.Itoa(p.SeqID)
+	return p.ID
 }
 
 type pingTransaction struct {
diff --git a/sim/msg.go b/sim/msg.go
index 8719033..6479d44 100644
--- a/sim/msg.go
+++ b/sim/msg.go
@@ -22,6 +22,11 @@ type Rsp interface {
 	GetRspTo() string
 }
 
+type Request interface {
+	Msg
+	GenerateRsp() Rsp
+}
+
 // GeneralRsp is a general response message that is used to indicate the
 // completion of a request.
 type GeneralRsp struct {
diff --git a/sim/port.go b/sim/port.go
index 3898138..9e33348 100644
--- a/sim/port.go
+++ b/sim/port.go
@@ -73,7 +73,10 @@ func (m *sampleMsg) Meta() *MsgMeta {
 }
 
 func (m *sampleMsg) Clone() Msg {
-	return m
+	cloneMsg := *m
+	cloneMsg.ID = GetIDGenerator().Generate()
+
+	return &cloneMsg
 }
 
 // Name returns the name of the port.