diff --git a/pkg/core/gvisortunendpoint.go b/pkg/core/gvisortunendpoint.go
index f6849baa..0c5cf101 100755
--- a/pkg/core/gvisortunendpoint.go
+++ b/pkg/core/gvisortunendpoint.go
@@ -107,6 +107,7 @@ func (h *gvisorTCPHandler) readFromTCPConnWriteToEndpoint(ctx context.Context, c
 				Data:       buf[:],
 			}, func(v *DatagramPacket) {
 				config.LPool.Put(v.Data[:])
+				plog.G(context.Background()).Errorf("Drop packet, SRC: %s, DST: %s, Length: %d", src, dst, v.DataLength)
 			})
 			continue
 		}
diff --git a/pkg/core/tcphandler.go b/pkg/core/tcphandler.go
index a27b1245..cb48e8fd 100644
--- a/pkg/core/tcphandler.go
+++ b/pkg/core/tcphandler.go
@@ -71,8 +71,8 @@ func (h *UDPOverTCPHandler) Handle(ctx context.Context, tcpConn net.Conn) {
 			return
 		}
 
-		var src net.IP
-		src, _, err = util.ParseIP(packet.Data[:packet.DataLength])
+		var src, dst net.IP
+		src, dst, err = util.ParseIP(packet.Data[:packet.DataLength])
 		if err != nil {
 			plog.G(ctx).Errorf("[TCP] Unknown packet")
 			config.LPool.Put(buf[:])
@@ -89,6 +89,7 @@ func (h *UDPOverTCPHandler) Handle(ctx context.Context, tcpConn net.Conn) {
 		}
 		util.SafeWrite(h.packetChan, packet, func(v *DatagramPacket) {
 			config.LPool.Put(v.Data[:])
+			plog.G(context.Background()).Errorf("Drop packet, SRC: %s, DST: %s, Length: %d", src, dst, v.DataLength)
 		})
 	}
 }
diff --git a/pkg/core/tunhandler.go b/pkg/core/tunhandler.go
index 7e71165b..fe9134b9 100644
--- a/pkg/core/tunhandler.go
+++ b/pkg/core/tunhandler.go
@@ -104,6 +104,7 @@ func (d *Device) readFromTUN(ctx context.Context) {
 			dst:    dst,
 		}, func(v *Packet) {
 			config.LPool.Put(v.data[:])
+			plog.G(context.Background()).Errorf("Drop packet, SRC: %s, DST: %s, Length: %d", v.src, v.dst, v.length)
 		})
 	}
 }
diff --git a/pkg/core/tunhandlerclient.go b/pkg/core/tunhandlerclient.go
index b9be23d0..fba2a459 100644
--- a/pkg/core/tunhandlerclient.go
+++ b/pkg/core/tunhandlerclient.go
@@ -96,6 +96,7 @@ func transportTunPacketClient(ctx context.Context, tunInbound <-chan *Packet, tu
 			if packet.src.Equal(packet.dst) {
 				util.SafeWrite(tunOutbound, packet, func(v *Packet) {
 					config.LPool.Put(v.data[:])
+					plog.G(context.Background()).Errorf("Drop packet, SRC: %s, DST: %s, Length: %d", v.src, v.dst, v.length)
 				})
 				continue
 			}
@@ -120,6 +121,7 @@ func transportTunPacketClient(ctx context.Context, tunInbound <-chan *Packet, tu
 			}
 			util.SafeWrite(tunOutbound, &Packet{data: buf[:], length: n}, func(v *Packet) {
 				config.LPool.Put(v.data[:])
+				plog.G(context.Background()).Errorf("Drop packet, LocalAddr: %s, Remote: %s, Length: %d", packetConn.LocalAddr(), remoteAddr, v.length)
 			})
 		}
 	}()
@@ -155,6 +157,7 @@ func (d *ClientDevice) readFromTun(ctx context.Context) {
 		plog.G(context.Background()).Debugf("[TUN-CLIENT] SRC: %s, DST: %s, Length: %d", src.String(), dst, n)
 		util.SafeWrite(d.tunInbound, NewPacket(buf[:], n, src, dst), func(v *Packet) {
 			config.LPool.Put(v.data[:])
+			plog.G(context.Background()).Errorf("Drop packet, SRC: %s, DST: %s, Length: %d", v.src, v.dst, v.length)
 		})
 	}
 }