diff --git a/app/proxyman/inbound/worker.go b/app/proxyman/inbound/worker.go
index fc51c74ab..0eb4f0c4a 100644
--- a/app/proxyman/inbound/worker.go
+++ b/app/proxyman/inbound/worker.go
@@ -88,7 +88,6 @@ func (w *tcpWorker) handleConnections(conns <-chan internet.Connection) {
 			for {
 				select {
 				case conn := <-conns:
-					conn.SetReusable(false)
 					conn.Close()
 				default:
 					break L
@@ -166,12 +165,6 @@ func (*udpConn) SetWriteDeadline(time.Time) error {
 	return nil
 }
 
-func (*udpConn) Reusable() bool {
-	return false
-}
-
-func (*udpConn) SetReusable(bool) {}
-
 type udpWorker struct {
 	sync.RWMutex
 
diff --git a/app/proxyman/outbound/handler.go b/app/proxyman/outbound/handler.go
index 2e26c2570..7fa4d889c 100644
--- a/app/proxyman/outbound/handler.go
+++ b/app/proxyman/outbound/handler.go
@@ -191,11 +191,3 @@ func (v *Connection) SetReadDeadline(t time.Time) error {
 func (v *Connection) SetWriteDeadline(t time.Time) error {
 	return nil
 }
-
-func (v *Connection) Reusable() bool {
-	return false
-}
-
-func (v *Connection) SetReusable(bool) {
-
-}
diff --git a/common/protocol/headers_test.go b/common/protocol/headers_test.go
index ab7ad7951..5ecbdd8ab 100644
--- a/common/protocol/headers_test.go
+++ b/common/protocol/headers_test.go
@@ -16,8 +16,8 @@ func TestRequestOptionSet(t *testing.T) {
 	option.Set(RequestOptionChunkStream)
 	assert.Bool(option.Has(RequestOptionChunkStream)).IsTrue()
 
-	option.Set(RequestOptionConnectionReuse)
-	assert.Bool(option.Has(RequestOptionConnectionReuse)).IsTrue()
+	option.Set(RequestOptionChunkMasking)
+	assert.Bool(option.Has(RequestOptionChunkMasking)).IsTrue()
 	assert.Bool(option.Has(RequestOptionChunkStream)).IsTrue()
 }
 
@@ -26,9 +26,9 @@ func TestRequestOptionClear(t *testing.T) {
 
 	var option RequestOption
 	option.Set(RequestOptionChunkStream)
-	option.Set(RequestOptionConnectionReuse)
+	option.Set(RequestOptionChunkMasking)
 
 	option.Clear(RequestOptionChunkStream)
 	assert.Bool(option.Has(RequestOptionChunkStream)).IsFalse()
-	assert.Bool(option.Has(RequestOptionConnectionReuse)).IsTrue()
+	assert.Bool(option.Has(RequestOptionChunkMasking)).IsTrue()
 }
diff --git a/proxy/dokodemo/dokodemo.go b/proxy/dokodemo/dokodemo.go
index eca4ceaca..9a45009b1 100644
--- a/proxy/dokodemo/dokodemo.go
+++ b/proxy/dokodemo/dokodemo.go
@@ -45,7 +45,6 @@ func (d *DokodemoDoor) Network() net.NetworkList {
 
 func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
 	log.Trace(errors.New("Dokodemo: processing connection from: ", conn.RemoteAddr()).AtDebug())
-	conn.SetReusable(false)
 	dest := net.Destination{
 		Network: network,
 		Address: d.address,
diff --git a/proxy/freedom/freedom.go b/proxy/freedom/freedom.go
index 260299501..45767e608 100644
--- a/proxy/freedom/freedom.go
+++ b/proxy/freedom/freedom.go
@@ -105,8 +105,6 @@ func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dial
 	}
 	defer conn.Close()
 
-	conn.SetReusable(false)
-
 	timeout := time.Second * time.Duration(v.timeout)
 	if timeout == 0 {
 		timeout = time.Minute * 5
diff --git a/proxy/http/server.go b/proxy/http/server.go
index 46ed302e9..f546406d0 100644
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -69,8 +69,6 @@ func parseHost(rawHost string, defaultPort v2net.Port) (v2net.Destination, error
 }
 
 func (s *Server) Process(ctx context.Context, network v2net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
-	conn.SetReusable(false)
-
 	conn.SetReadDeadline(time.Now().Add(time.Second * 8))
 	reader := bufio.NewReaderSize(conn, 2048)
 
diff --git a/proxy/shadowsocks/client.go b/proxy/shadowsocks/client.go
index 0722872e9..08cf354ae 100644
--- a/proxy/shadowsocks/client.go
+++ b/proxy/shadowsocks/client.go
@@ -65,7 +65,6 @@ func (v *Client) Process(ctx context.Context, outboundRay ray.OutboundRay, diale
 	log.Trace(errors.New("tunneling request to ", destination, " via ", server.Destination()).Path("Proxy", "Shadowsocks", "Client"))
 
 	defer conn.Close()
-	conn.SetReusable(false)
 
 	request := &protocol.RequestHeader{
 		Version: Version,
diff --git a/proxy/shadowsocks/server.go b/proxy/shadowsocks/server.go
index f0c0c66b0..2933cfc5d 100644
--- a/proxy/shadowsocks/server.go
+++ b/proxy/shadowsocks/server.go
@@ -60,8 +60,6 @@ func (s *Server) Network() net.NetworkList {
 }
 
 func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
-	conn.SetReusable(false)
-
 	switch network {
 	case net.Network_TCP:
 		return s.handleConnection(ctx, conn, dispatcher)
@@ -183,7 +181,8 @@ func (s *Server) handleConnection(ctx context.Context, conn internet.Connection,
 	responseDone := signal.ExecuteAsync(func() error {
 		defer ray.InboundInput().Close()
 
-		if err := buf.PipeUntilEOF(timer, bodyReader, ray.InboundInput()); err != nil {
+		mergeReader := buf.NewMergingReader(bodyReader)
+		if err := buf.PipeUntilEOF(timer, mergeReader, ray.InboundInput()); err != nil {
 			return errors.New("failed to transport all TCP request").Base(err).Path("Shadowsocks", "Server")
 		}
 		return nil
diff --git a/proxy/socks/client.go b/proxy/socks/client.go
index 735a258b7..2efeb90a0 100644
--- a/proxy/socks/client.go
+++ b/proxy/socks/client.go
@@ -59,7 +59,6 @@ func (c *Client) Process(ctx context.Context, ray ray.OutboundRay, dialer proxy.
 	}
 
 	defer conn.Close()
-	conn.SetReusable(false)
 
 	request := &protocol.RequestHeader{
 		Version: socks5Version,
diff --git a/proxy/socks/server.go b/proxy/socks/server.go
index 8b236471e..44eea4445 100644
--- a/proxy/socks/server.go
+++ b/proxy/socks/server.go
@@ -48,8 +48,6 @@ func (s *Server) Network() net.NetworkList {
 }
 
 func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
-	conn.SetReusable(false)
-
 	switch network {
 	case net.Network_TCP:
 		return s.processTCP(ctx, conn, dispatcher)
diff --git a/proxy/vmess/encoding/encoding_test.go b/proxy/vmess/encoding/encoding_test.go
index f92ea99f5..452d9a6bd 100644
--- a/proxy/vmess/encoding/encoding_test.go
+++ b/proxy/vmess/encoding/encoding_test.go
@@ -31,7 +31,6 @@ func TestRequestSerialization(t *testing.T) {
 		Version:  1,
 		User:     user,
 		Command:  protocol.RequestCommandTCP,
-		Option:   protocol.RequestOptionConnectionReuse,
 		Address:  v2net.DomainAddress("www.v2ray.com"),
 		Port:     v2net.Port(443),
 		Security: protocol.Security(protocol.SecurityType_AES128_GCM),
diff --git a/proxy/vmess/inbound/inbound.go b/proxy/vmess/inbound/inbound.go
index 8a7fdc624..3280aaeeb 100644
--- a/proxy/vmess/inbound/inbound.go
+++ b/proxy/vmess/inbound/inbound.go
@@ -138,8 +138,9 @@ func transferResponse(timer signal.ActivityTimer, session *encoding.ServerSessio
 
 	bodyWriter := session.EncodeResponseBody(request, output)
 
+	mergeReader := buf.NewMergingReader(input)
 	// Optimize for small response packet
-	data, err := input.Read()
+	data, err := mergeReader.Read()
 	if err != nil {
 		return err
 	}
@@ -155,7 +156,7 @@ func transferResponse(timer signal.ActivityTimer, session *encoding.ServerSessio
 		}
 	}
 
-	if err := buf.PipeUntilEOF(timer, input, bodyWriter); err != nil {
+	if err := buf.PipeUntilEOF(timer, mergeReader, bodyWriter); err != nil {
 		return err
 	}
 
@@ -181,7 +182,6 @@ func (v *Handler) Process(ctx context.Context, network net.Network, connection i
 			log.Access(connection.RemoteAddr(), "", log.AccessRejected, err)
 			log.Trace(errors.New("VMess|Inbound: Invalid request from ", connection.RemoteAddr(), ": ", err))
 		}
-		connection.SetReusable(false)
 		return err
 	}
 	log.Access(connection.RemoteAddr(), request.Destination(), log.AccessAccepted, "")
@@ -189,7 +189,6 @@ func (v *Handler) Process(ctx context.Context, network net.Network, connection i
 
 	connection.SetReadDeadline(time.Time{})
 
-	connection.SetReusable(request.Option.Has(protocol.RequestOptionConnectionReuse))
 	userSettings := request.User.GetSettings()
 
 	ctx = protocol.ContextWithUser(ctx, request.User)
@@ -214,24 +213,18 @@ func (v *Handler) Process(ctx context.Context, network net.Network, connection i
 		Command: v.generateCommand(ctx, request),
 	}
 
-	if connection.Reusable() {
-		response.Option.Set(protocol.ResponseOptionConnectionReuse)
-	}
-
 	responseDone := signal.ExecuteAsync(func() error {
 		return transferResponse(timer, session, request, response, output, writer)
 	})
 
 	if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
-		connection.SetReusable(false)
 		input.CloseError()
 		output.CloseError()
-		return errors.New("error during processing").Base(err).Path("VMess", "Inbound")
+		return errors.New("error during processing").Base(err).Path("Proxy", "VMess", "Inbound")
 	}
 
 	if err := writer.Flush(); err != nil {
-		connection.SetReusable(false)
-		return errors.New("error during flushing remaining data").Base(err).Path("VMess", "Inbound")
+		return errors.New("error during flushing remaining data").Base(err).Path("Proxy", "VMess", "Inbound")
 	}
 
 	runtime.KeepAlive(timer)
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index 9931a5455..6a466d4da 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -95,11 +95,6 @@ func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dial
 		request.Option.Set(protocol.RequestOptionChunkMasking)
 	}
 
-	conn.SetReusable(true)
-	if conn.Reusable() { // Conn reuse may be disabled on transportation layer
-		request.Option.Set(protocol.RequestOptionConnectionReuse)
-	}
-
 	input := outboundRay.OutboundInput()
 	output := outboundRay.OutboundOutput()
 
@@ -154,8 +149,6 @@ func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dial
 		}
 		v.handleCommand(rec.Destination(), header.Command)
 
-		conn.SetReusable(header.Option.Has(protocol.ResponseOptionConnectionReuse))
-
 		reader.SetBuffered(false)
 		bodyReader := session.DecodeResponseBody(request, reader)
 		if err := buf.PipeUntilEOF(timer, bodyReader, output); err != nil {
@@ -166,7 +159,6 @@ func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dial
 	})
 
 	if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
-		conn.SetReusable(false)
 		return errors.New("connection ends").Base(err).Path("VMess", "Outbound")
 	}
 	runtime.KeepAlive(timer)
diff --git a/testing/scenarios/tls_test.go b/testing/scenarios/tls_test.go
index faff65a94..2059fbcc8 100644
--- a/testing/scenarios/tls_test.go
+++ b/testing/scenarios/tls_test.go
@@ -341,11 +341,7 @@ func TestTLSOverWebSocket(t *testing.T) {
 						TransportSettings: []*internet.TransportConfig{
 							{
 								Protocol: internet.TransportProtocol_WebSocket,
-								Settings: serial.ToTypedMessage(&websocket.Config{
-									ConnectionReuse: &websocket.ConnectionReuse{
-										Enable: false,
-									},
-								}),
+								Settings: serial.ToTypedMessage(&websocket.Config{}),
 							},
 						},
 						SecurityType: serial.GetMessageType(&tls.Config{}),
@@ -381,136 +377,3 @@ func TestTLSOverWebSocket(t *testing.T) {
 
 	CloseAllServers()
 }
-
-func TestTLSConnectionReuse(t *testing.T) {
-	assert := assert.On(t)
-
-	tcpServer := tcp.Server{
-		MsgProcessor: xor,
-	}
-	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
-	defer tcpServer.Close()
-
-	userID := protocol.NewID(uuid.New())
-	serverPort := pickPort()
-	serverConfig := &core.Config{
-		Inbound: []*proxyman.InboundHandlerConfig{
-			{
-				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
-					PortRange: v2net.SinglePortRange(serverPort),
-					Listen:    v2net.NewIPOrDomain(v2net.LocalHostIP),
-					StreamSettings: &internet.StreamConfig{
-						SecurityType: serial.GetMessageType(&tls.Config{}),
-						SecuritySettings: []*serial.TypedMessage{
-							serial.ToTypedMessage(&tls.Config{
-								Certificate: []*tls.Certificate{tlsgen.GenerateCertificateForTest()},
-							}),
-						},
-					},
-				}),
-				ProxySettings: serial.ToTypedMessage(&inbound.Config{
-					User: []*protocol.User{
-						{
-							Account: serial.ToTypedMessage(&vmess.Account{
-								Id: userID.String(),
-							}),
-						},
-					},
-				}),
-			},
-		},
-		Outbound: []*proxyman.OutboundHandlerConfig{
-			{
-				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
-			},
-		},
-	}
-
-	clientPort := pickPort()
-	clientConfig := &core.Config{
-		Inbound: []*proxyman.InboundHandlerConfig{
-			{
-				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
-					PortRange: v2net.SinglePortRange(clientPort),
-					Listen:    v2net.NewIPOrDomain(v2net.LocalHostIP),
-				}),
-				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
-					Address: v2net.NewIPOrDomain(dest.Address),
-					Port:    uint32(dest.Port),
-					NetworkList: &v2net.NetworkList{
-						Network: []v2net.Network{v2net.Network_TCP},
-					},
-				}),
-			},
-		},
-		Outbound: []*proxyman.OutboundHandlerConfig{
-			{
-				ProxySettings: serial.ToTypedMessage(&outbound.Config{
-					Receiver: []*protocol.ServerEndpoint{
-						{
-							Address: v2net.NewIPOrDomain(v2net.LocalHostIP),
-							Port:    uint32(serverPort),
-							User: []*protocol.User{
-								{
-									Account: serial.ToTypedMessage(&vmess.Account{
-										Id: userID.String(),
-									}),
-								},
-							},
-						},
-					},
-				}),
-				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
-					StreamSettings: &internet.StreamConfig{
-						SecurityType: serial.GetMessageType(&tls.Config{}),
-						SecuritySettings: []*serial.TypedMessage{
-							serial.ToTypedMessage(&tls.Config{
-								AllowInsecure: true,
-							}),
-						},
-					},
-				}),
-			},
-		},
-	}
-
-	assert.Error(InitializeServerConfig(serverConfig)).IsNil()
-	assert.Error(InitializeServerConfig(clientConfig)).IsNil()
-
-	for i := 0; i < 5; i++ {
-		conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
-			IP:   []byte{127, 0, 0, 1},
-			Port: int(clientPort),
-		})
-		assert.Error(err).IsNil()
-
-		payload := "dokodemo request."
-		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
-
-		response := readFrom(conn, time.Second*2, len(payload))
-		assert.Bytes(response).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
-	}
-
-	time.Sleep(time.Second * 10)
-
-	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
-		IP:   []byte{127, 0, 0, 1},
-		Port: int(clientPort),
-	})
-	assert.Error(err).IsNil()
-
-	payload := "dokodemo request."
-	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
-
-	response := readFrom(conn, time.Second*2, len(payload))
-	assert.Bytes(response).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
-
-	CloseAllServers()
-}
diff --git a/tools/conf/transport_internet.go b/tools/conf/transport_internet.go
index 38d2a0758..2ec2423ee 100644
--- a/tools/conf/transport_internet.go
+++ b/tools/conf/transport_internet.go
@@ -97,17 +97,11 @@ func (v *KCPConfig) Build() (*serial.TypedMessage, error) {
 }
 
 type TCPConfig struct {
-	ConnectionReuse *bool           `json:"connectionReuse"`
-	HeaderConfig    json.RawMessage `json:"header"`
+	HeaderConfig json.RawMessage `json:"header"`
 }
 
 func (v *TCPConfig) Build() (*serial.TypedMessage, error) {
 	config := new(tcp.Config)
-	if v.ConnectionReuse != nil {
-		config.ConnectionReuse = &tcp.ConnectionReuse{
-			Enable: *v.ConnectionReuse,
-		}
-	}
 	if len(v.HeaderConfig) > 0 {
 		headerConfig, _, err := tcpHeaderLoader.Load(v.HeaderConfig)
 		if err != nil {
@@ -124,19 +118,13 @@ func (v *TCPConfig) Build() (*serial.TypedMessage, error) {
 }
 
 type WebSocketConfig struct {
-	ConnectionReuse *bool  `json:"connectionReuse"`
-	Path            string `json:"Path"`
+	Path string `json:"Path"`
 }
 
 func (v *WebSocketConfig) Build() (*serial.TypedMessage, error) {
 	config := &websocket.Config{
 		Path: v.Path,
 	}
-	if v.ConnectionReuse != nil {
-		config.ConnectionReuse = &websocket.ConnectionReuse{
-			Enable: *v.ConnectionReuse,
-		}
-	}
 	return serial.ToTypedMessage(config), nil
 }
 
diff --git a/tools/conf/transport_test.go b/tools/conf/transport_test.go
index 280565aec..b2f1bf3f4 100644
--- a/tools/conf/transport_test.go
+++ b/tools/conf/transport_test.go
@@ -19,7 +19,6 @@ func TestTransportConfig(t *testing.T) {
 
 	rawJson := `{
     "tcpSettings": {
-      "connectionReuse": true,
       "header": {
         "type": "http",
         "request": {
@@ -64,7 +63,6 @@ func TestTransportConfig(t *testing.T) {
 		case *tcp.Config:
 			settingsCount++
 			assert.Bool(settingsWithProtocol.Protocol == internet.TransportProtocol_TCP).IsTrue()
-			assert.Bool(settings.IsConnectionReuse()).IsTrue()
 			rawHeader, err := settings.HeaderSettings.GetInstance()
 			assert.Error(err).IsNil()
 			header := rawHeader.(*http.Config)
diff --git a/transport/internet/connection.go b/transport/internet/connection.go
index f0f33cc15..b526f7469 100644
--- a/transport/internet/connection.go
+++ b/transport/internet/connection.go
@@ -6,14 +6,8 @@ import (
 
 type ConnectionHandler func(Connection)
 
-type Reusable interface {
-	Reusable() bool
-	SetReusable(reuse bool)
-}
-
 type Connection interface {
 	net.Conn
-	Reusable
 }
 
 type SysFd interface {
diff --git a/transport/internet/internal/connection.go b/transport/internet/internal/connection.go
deleted file mode 100644
index 8dcb55cbc..000000000
--- a/transport/internet/internal/connection.go
+++ /dev/null
@@ -1,181 +0,0 @@
-package internal
-
-import (
-	"io"
-	"net"
-	"sync"
-	"time"
-
-	v2net "v2ray.com/core/common/net"
-)
-
-// ConnectionID is the ID of a connection.
-type ConnectionID struct {
-	Local      v2net.Address
-	Remote     v2net.Address
-	RemotePort v2net.Port
-}
-
-// NewConnectionID creates a new ConnectionId.
-func NewConnectionID(source v2net.Address, dest v2net.Destination) ConnectionID {
-	return ConnectionID{
-		Local:      source,
-		Remote:     dest.Address,
-		RemotePort: dest.Port,
-	}
-}
-
-// Reuser determines whether a connection can be reused or not.
-type Reuser struct {
-	// userEnabled indicates connection-reuse enabled by user.
-	userEnabled bool
-	// appEnabled indicates connection-reuse enabled by app.
-	appEnabled bool
-}
-
-// ReuseConnection returns a tracker for tracking connection reusability.
-func ReuseConnection(reuse bool) *Reuser {
-	return &Reuser{
-		userEnabled: reuse,
-		appEnabled:  reuse,
-	}
-}
-
-// Connection is an implementation of net.Conn with re-usability.
-type Connection struct {
-	sync.RWMutex
-	id       ConnectionID
-	conn     net.Conn
-	listener ConnectionRecyler
-	reuser   *Reuser
-}
-
-// NewConnection creates a new connection.
-func NewConnection(id ConnectionID, conn net.Conn, manager ConnectionRecyler, reuser *Reuser) *Connection {
-	return &Connection{
-		id:       id,
-		conn:     conn,
-		listener: manager,
-		reuser:   reuser,
-	}
-}
-
-// Read implements net.Conn.Read().
-func (v *Connection) Read(b []byte) (int, error) {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return 0, io.EOF
-	}
-
-	return conn.Read(b)
-}
-
-// Write implement net.Conn.Write().
-func (v *Connection) Write(b []byte) (int, error) {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return 0, io.ErrClosedPipe
-	}
-	return conn.Write(b)
-}
-
-// Close implements net.Conn.Close(). If the connection is reusable, the underlying connection will be recycled.
-func (v *Connection) Close() error {
-	if v == nil {
-		return io.ErrClosedPipe
-	}
-
-	v.Lock()
-	defer v.Unlock()
-	if v.conn == nil {
-		return io.ErrClosedPipe
-	}
-	if v.Reusable() {
-		v.listener.Put(v.id, v.conn)
-		return nil
-	}
-	err := v.conn.Close()
-	v.conn = nil
-	return err
-}
-
-// LocalAddr implements net.Conn.LocalAddr().
-func (v *Connection) LocalAddr() net.Addr {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return nil
-	}
-	return conn.LocalAddr()
-}
-
-// RemoteAddr implements net.Conn.RemoteAddr().
-func (v *Connection) RemoteAddr() net.Addr {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return nil
-	}
-	return conn.RemoteAddr()
-}
-
-// SetDeadline implements net.Conn.SetDeadline().
-func (v *Connection) SetDeadline(t time.Time) error {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return nil
-	}
-	return conn.SetDeadline(t)
-}
-
-// SetReadDeadline implements net.Conn.SetReadDeadline().
-func (v *Connection) SetReadDeadline(t time.Time) error {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return nil
-	}
-	return conn.SetReadDeadline(t)
-}
-
-// SetWriteDeadline implements net.Conn.SetWriteDeadline().
-func (v *Connection) SetWriteDeadline(t time.Time) error {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return nil
-	}
-	return conn.SetWriteDeadline(t)
-}
-
-// SetReusable implements internet.Reusable.SetReusable().
-func (v *Connection) SetReusable(reusable bool) {
-	if v == nil {
-		return
-	}
-	v.reuser.appEnabled = reusable
-}
-
-// Reusable implements internet.Reusable.Reusable().
-func (v *Connection) Reusable() bool {
-	if v == nil {
-		return false
-	}
-	return v.reuser.userEnabled && v.reuser.appEnabled
-}
-
-// SysFd implement internet.SysFd.SysFd().
-func (v *Connection) SysFd() (int, error) {
-	conn := v.underlyingConn()
-	if conn == nil {
-		return 0, io.ErrClosedPipe
-	}
-	return GetSysFd(conn)
-}
-
-func (v *Connection) underlyingConn() net.Conn {
-	if v == nil {
-		return nil
-	}
-
-	v.RLock()
-	defer v.RUnlock()
-
-	return v.conn
-}
diff --git a/transport/internet/internal/pool.go b/transport/internet/internal/pool.go
deleted file mode 100644
index 5c84ec837..000000000
--- a/transport/internet/internal/pool.go
+++ /dev/null
@@ -1,134 +0,0 @@
-package internal
-
-import (
-	"net"
-	"sync"
-	"time"
-
-	"v2ray.com/core/common/signal"
-)
-
-// ConnectionRecyler is the interface for recycling connections.
-type ConnectionRecyler interface {
-	// Put returns a connection back to a connection pool.
-	Put(ConnectionID, net.Conn)
-}
-
-type NoOpConnectionRecyler struct{}
-
-func (NoOpConnectionRecyler) Put(ConnectionID, net.Conn) {}
-
-// ExpiringConnection is a connection that will expire in certain time.
-type ExpiringConnection struct {
-	conn   net.Conn
-	expire time.Time
-}
-
-// Expired returns true if the connection has expired.
-func (ec *ExpiringConnection) Expired() bool {
-	return ec.expire.Before(time.Now())
-}
-
-// Pool is a connection pool.
-type Pool struct {
-	sync.RWMutex
-	connsByDest  map[ConnectionID][]*ExpiringConnection
-	cleanupToken *signal.Semaphore
-}
-
-// NewConnectionPool creates a new Pool.
-func NewConnectionPool() *Pool {
-	p := &Pool{
-		connsByDest:  make(map[ConnectionID][]*ExpiringConnection),
-		cleanupToken: signal.NewSemaphore(1),
-	}
-	return p
-}
-
-// Get returns a connection with matching connection ID. Nil if not found.
-func (p *Pool) Get(id ConnectionID) net.Conn {
-	p.Lock()
-	defer p.Unlock()
-
-	list, found := p.connsByDest[id]
-	if !found {
-		return nil
-	}
-	connIdx := -1
-	for idx, conn := range list {
-		if !conn.Expired() {
-			connIdx = idx
-			break
-		}
-	}
-	if connIdx == -1 {
-		return nil
-	}
-	listLen := len(list)
-	conn := list[connIdx]
-	if connIdx != listLen-1 {
-		list[connIdx] = list[listLen-1]
-	}
-	list = list[:listLen-1]
-	p.connsByDest[id] = list
-	return conn.conn
-}
-
-func (p *Pool) isEmpty() bool {
-	p.RLock()
-	defer p.RUnlock()
-
-	return len(p.connsByDest) == 0
-}
-
-func (p *Pool) cleanup() {
-	defer p.cleanupToken.Signal()
-
-	for !p.isEmpty() {
-		time.Sleep(time.Second * 5)
-		expiredConns := make([]net.Conn, 0, 16)
-		p.Lock()
-		for dest, list := range p.connsByDest {
-			validConns := make([]*ExpiringConnection, 0, len(list))
-			for _, conn := range list {
-				if conn.Expired() {
-					expiredConns = append(expiredConns, conn.conn)
-				} else {
-					validConns = append(validConns, conn)
-				}
-			}
-			if len(validConns) != len(list) {
-				p.connsByDest[dest] = validConns
-			}
-		}
-		p.Unlock()
-		for _, conn := range expiredConns {
-			conn.Close()
-		}
-	}
-}
-
-// Put implements ConnectionRecyler.Put().
-func (p *Pool) Put(id ConnectionID, conn net.Conn) {
-	expiringConn := &ExpiringConnection{
-		conn:   conn,
-		expire: time.Now().Add(time.Second * 4),
-	}
-
-	p.Lock()
-	defer p.Unlock()
-
-	list, found := p.connsByDest[id]
-	if !found {
-		list = []*ExpiringConnection{expiringConn}
-	} else {
-		list = append(list, expiringConn)
-	}
-	p.connsByDest[id] = list
-
-	select {
-	case <-p.cleanupToken.Wait():
-		go p.cleanup()
-	default:
-	}
-}
diff --git a/transport/internet/internal/pool_test.go b/transport/internet/internal/pool_test.go
deleted file mode 100644
index ceec14b51..000000000
--- a/transport/internet/internal/pool_test.go
+++ /dev/null
@@ -1,73 +0,0 @@
-package internal_test
-
-import (
-	"net"
-	"testing"
-	"time"
-
-	v2net "v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
-	. "v2ray.com/core/transport/internet/internal"
-)
-
-type TestConnection struct {
-	id     string
-	closed bool
-}
-
-func (o *TestConnection) Read([]byte) (int, error) {
-	return 0, nil
-}
-
-func (o *TestConnection) Write([]byte) (int, error) {
-	return 0, nil
-}
-
-func (o *TestConnection) Close() error {
-	o.closed = true
-	return nil
-}
-
-func (o *TestConnection) LocalAddr() net.Addr {
-	return nil
-}
-
-func (o *TestConnection) RemoteAddr() net.Addr {
-	return nil
-}
-
-func (o *TestConnection) SetDeadline(t time.Time) error {
-	return nil
-}
-
-func (o *TestConnection) SetReadDeadline(t time.Time) error {
-	return nil
-}
-
-func (o *TestConnection) SetWriteDeadline(t time.Time) error {
-	return nil
-}
-
-func TestConnectionCache(t *testing.T) {
-	assert := assert.On(t)
-
-	pool := NewConnectionPool()
-	conn := pool.Get(NewConnectionID(v2net.LocalHostIP, v2net.TCPDestination(v2net.LocalHostIP, v2net.Port(80))))
-	assert.Pointer(conn).IsNil()
-
-	pool.Put(NewConnectionID(v2net.LocalHostIP, v2net.TCPDestination(v2net.LocalHostIP, v2net.Port(80))), &TestConnection{id: "test"})
-	conn = pool.Get(NewConnectionID(v2net.LocalHostIP, v2net.TCPDestination(v2net.LocalHostIP, v2net.Port(80))))
-	assert.String(conn.(*TestConnection).id).Equals("test")
-}
-
-func TestConnectionRecycle(t *testing.T) {
-	assert := assert.On(t)
-
-	pool := NewConnectionPool()
-	c := &TestConnection{id: "test"}
-	pool.Put(NewConnectionID(v2net.LocalHostIP, v2net.TCPDestination(v2net.LocalHostIP, v2net.Port(80))), c)
-	time.Sleep(6 * time.Second)
-	assert.Bool(c.closed).IsTrue()
-	conn := pool.Get(NewConnectionID(v2net.LocalHostIP, v2net.TCPDestination(v2net.LocalHostIP, v2net.Port(80))))
-	assert.Pointer(conn).IsNil()
-}
diff --git a/transport/internet/kcp/config.go b/transport/internet/kcp/config.go
index b0131fff9..606df8ea4 100644
--- a/transport/internet/kcp/config.go
+++ b/transport/internet/kcp/config.go
@@ -96,13 +96,6 @@ func (v *Config) GetReceivingBufferSize() uint32 {
 	return v.GetReadBufferSize() / v.GetMTUValue()
 }
 
-func (v *Config) IsConnectionReuse() bool {
-	if v == nil || v.ConnectionReuse == nil {
-		return true
-	}
-	return v.ConnectionReuse.Enable
-}
-
 func init() {
 	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_MKCP, func() interface{} {
 		return new(Config)
diff --git a/transport/internet/kcp/config.pb.go b/transport/internet/kcp/config.pb.go
index e7b4c5544..1c0811660 100644
--- a/transport/internet/kcp/config.pb.go
+++ b/transport/internet/kcp/config.pb.go
@@ -143,7 +143,6 @@ type Config struct {
 	WriteBuffer      *WriteBuffer                           `protobuf:"bytes,6,opt,name=write_buffer,json=writeBuffer" json:"write_buffer,omitempty"`
 	ReadBuffer       *ReadBuffer                            `protobuf:"bytes,7,opt,name=read_buffer,json=readBuffer" json:"read_buffer,omitempty"`
 	HeaderConfig     *v2ray_core_common_serial.TypedMessage `protobuf:"bytes,8,opt,name=header_config,json=headerConfig" json:"header_config,omitempty"`
-	ConnectionReuse  *ConnectionReuse                       `protobuf:"bytes,9,opt,name=connection_reuse,json=connectionReuse" json:"connection_reuse,omitempty"`
 }
 
 func (m *Config) Reset()                    { *m = Config{} }
@@ -207,13 +206,6 @@ func (m *Config) GetHeaderConfig() *v2ray_core_common_serial.TypedMessage {
 	return nil
 }
 
-func (m *Config) GetConnectionReuse() *ConnectionReuse {
-	if m != nil {
-		return m.ConnectionReuse
-	}
-	return nil
-}
-
 func init() {
 	proto.RegisterType((*MTU)(nil), "v2ray.core.transport.internet.kcp.MTU")
 	proto.RegisterType((*TTI)(nil), "v2ray.core.transport.internet.kcp.TTI")
@@ -228,36 +220,35 @@ func init() {
 func init() { proto.RegisterFile("v2ray.com/core/transport/internet/kcp/config.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 487 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x94, 0x5f, 0x6f, 0xd3, 0x30,
-	0x14, 0xc5, 0xd5, 0x75, 0x2d, 0xe3, 0x76, 0x5b, 0x4b, 0x84, 0x50, 0x04, 0x12, 0x5a, 0x2b, 0x31,
-	0x8d, 0x07, 0x1c, 0xc8, 0x5e, 0x78, 0x5e, 0x79, 0xa9, 0xa6, 0x22, 0xb0, 0x52, 0x90, 0x26, 0xa1,
-	0xe0, 0x3a, 0xb7, 0x25, 0x6a, 0x63, 0x47, 0x8e, 0xb3, 0xaa, 0x7c, 0x23, 0xf8, 0x94, 0xc8, 0x4e,
-	0xd3, 0x7f, 0x68, 0x6b, 0xde, 0x6a, 0xdf, 0x73, 0x7f, 0xae, 0xce, 0x3d, 0x37, 0xe0, 0xdf, 0xfb,
-	0x8a, 0x2d, 0x09, 0x97, 0x89, 0xc7, 0xa5, 0x42, 0x4f, 0x2b, 0x26, 0xb2, 0x54, 0x2a, 0xed, 0xc5,
-	0x42, 0xa3, 0x12, 0xa8, 0xbd, 0x19, 0x4f, 0x3d, 0x2e, 0xc5, 0x24, 0x9e, 0x92, 0x54, 0x49, 0x2d,
-	0x9d, 0x6e, 0xd9, 0xa3, 0x90, 0xac, 0xf5, 0xa4, 0xd4, 0x93, 0x19, 0x4f, 0x5f, 0xbe, 0xdf, 0xc3,
-	0x72, 0x99, 0x24, 0x52, 0x78, 0x19, 0xaa, 0x98, 0xcd, 0x3d, 0xbd, 0x4c, 0x31, 0x0a, 0x13, 0xcc,
-	0x32, 0x36, 0xc5, 0x02, 0xda, 0x7b, 0x05, 0xf5, 0x61, 0x30, 0x72, 0x9e, 0x43, 0xe3, 0x9e, 0xcd,
-	0x73, 0x74, 0x6b, 0x17, 0xb5, 0xab, 0x33, 0x5a, 0x1c, 0x4c, 0x31, 0x08, 0x06, 0x0f, 0x14, 0x2f,
-	0xe1, 0x7c, 0x94, 0xce, 0x63, 0x31, 0xeb, 0xb3, 0x94, 0xf1, 0x58, 0x2f, 0x1f, 0xd0, 0x5d, 0x41,
-	0xe7, 0x93, 0x5c, 0x88, 0x0a, 0xca, 0x2e, 0xb4, 0xbe, 0xab, 0x58, 0xe3, 0x4d, 0x3e, 0x99, 0xa0,
-	0x72, 0x1c, 0x38, 0xce, 0xe2, 0xdf, 0xa5, 0xc6, 0xfe, 0xee, 0x5d, 0x00, 0x50, 0x64, 0xd1, 0x23,
-	0x8a, 0xb7, 0xd0, 0xee, 0x4b, 0x21, 0x90, 0xeb, 0x58, 0x0a, 0x8a, 0x79, 0x86, 0xce, 0x0b, 0x68,
-	0xa2, 0x60, 0xe3, 0x79, 0x21, 0x3c, 0xa1, 0xab, 0x53, 0xef, 0x4f, 0x03, 0x9a, 0x7d, 0xeb, 0xb0,
-	0xf3, 0x11, 0xea, 0x89, 0xce, 0x6d, 0xbd, 0xe5, 0x5f, 0x92, 0x83, 0x4e, 0x93, 0x61, 0x30, 0xa2,
-	0xa6, 0xc5, 0x74, 0x6a, 0x1d, 0xbb, 0x47, 0x95, 0x3b, 0x83, 0x60, 0x40, 0x4d, 0x8b, 0x73, 0x07,
-	0xed, 0xdc, 0x1a, 0x18, 0xf2, 0x95, 0x2f, 0x6e, 0xdd, 0x52, 0x3e, 0x54, 0xa0, 0xec, 0x5a, 0x4f,
-	0xcf, 0xf3, 0xdd, 0x51, 0xfc, 0x84, 0x67, 0xd1, 0xca, 0xf4, 0x0d, 0xfd, 0xd8, 0xd2, 0xaf, 0x2b,
-	0xd0, 0xf7, 0x07, 0x46, 0x3b, 0xd1, 0xfe, 0x08, 0x5f, 0x03, 0x70, 0x29, 0xa6, 0x98, 0x19, 0x9f,
-	0xdd, 0x86, 0x35, 0x76, 0xeb, 0xc6, 0xf9, 0x0a, 0xa7, 0x0b, 0x33, 0xcc, 0x70, 0x6c, 0x67, 0xe5,
-	0x36, 0xed, 0xe3, 0xa4, 0xc2, 0xe3, 0x5b, 0x19, 0xa0, 0xad, 0xc5, 0x56, 0x20, 0x3e, 0x43, 0x4b,
-	0x21, 0x8b, 0x4a, 0xe2, 0x13, 0x4b, 0x7c, 0x57, 0x81, 0xb8, 0x89, 0x0c, 0x05, 0xb5, 0x89, 0xcf,
-	0x2d, 0x9c, 0xfd, 0x42, 0x16, 0xa1, 0x0a, 0x8b, 0x3d, 0x73, 0x4f, 0xfe, 0x1f, 0x62, 0xb1, 0x41,
-	0xa4, 0xd8, 0x20, 0x12, 0x98, 0x0d, 0x1a, 0x16, 0x0b, 0x44, 0x4f, 0x8b, 0xe6, 0x55, 0x82, 0x7e,
-	0x40, 0x87, 0xaf, 0x73, 0x17, 0x2a, 0x13, 0x3c, 0xf7, 0xa9, 0xe5, 0xf9, 0x15, 0xfe, 0xe1, 0x5e,
-	0x64, 0x69, 0x9b, 0xef, 0x5e, 0xdc, 0x50, 0x78, 0xc3, 0x65, 0x72, 0x98, 0xf4, 0xa5, 0x76, 0x57,
-	0x9f, 0xf1, 0xf4, 0xef, 0x51, 0xf7, 0x9b, 0x4f, 0xd9, 0x92, 0xf4, 0x8d, 0x34, 0x58, 0x4b, 0x07,
-	0xa5, 0xf4, 0x96, 0xa7, 0xe3, 0xa6, 0xfd, 0x04, 0x5c, 0xff, 0x0b, 0x00, 0x00, 0xff, 0xff, 0x1d,
-	0x04, 0x18, 0x2b, 0x8d, 0x04, 0x00, 0x00,
+	// 471 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x53, 0x5f, 0x6f, 0xd3, 0x3e,
+	0x14, 0x55, 0xd7, 0xae, 0xbf, 0xfe, 0x6e, 0xf7, 0xa7, 0x44, 0x08, 0x45, 0x20, 0xa1, 0xb5, 0x12,
+	0xd3, 0x78, 0xc0, 0x81, 0xee, 0x85, 0xe7, 0x95, 0x97, 0x32, 0x15, 0x81, 0x95, 0x82, 0xb4, 0x97,
+	0xe2, 0x3a, 0xb7, 0xc5, 0x6a, 0x63, 0x5b, 0x8e, 0xb3, 0xaa, 0x7c, 0x24, 0x3e, 0x0d, 0x1f, 0x09,
+	0xc5, 0x6e, 0xd6, 0xae, 0x68, 0x2c, 0x6f, 0x71, 0xee, 0x39, 0xc7, 0xd6, 0x39, 0xf7, 0x40, 0xff,
+	0xb6, 0x6f, 0xd8, 0x9a, 0x70, 0x95, 0x46, 0x5c, 0x19, 0x8c, 0xac, 0x61, 0x32, 0xd3, 0xca, 0xd8,
+	0x48, 0x48, 0x8b, 0x46, 0xa2, 0x8d, 0x16, 0x5c, 0x47, 0x5c, 0xc9, 0x99, 0x98, 0x13, 0x6d, 0x94,
+	0x55, 0x41, 0xb7, 0xe4, 0x18, 0x24, 0x77, 0x78, 0x52, 0xe2, 0xc9, 0x82, 0xeb, 0xe7, 0x6f, 0xf7,
+	0x64, 0xb9, 0x4a, 0x53, 0x25, 0xa3, 0x0c, 0x8d, 0x60, 0xcb, 0xc8, 0xae, 0x35, 0x26, 0x93, 0x14,
+	0xb3, 0x8c, 0xcd, 0xd1, 0x8b, 0xf6, 0x5e, 0x40, 0x7d, 0x14, 0x8f, 0x83, 0xa7, 0x70, 0x78, 0xcb,
+	0x96, 0x39, 0x86, 0xb5, 0xb3, 0xda, 0xc5, 0x31, 0xf5, 0x87, 0x62, 0x18, 0xc7, 0xc3, 0x07, 0x86,
+	0xe7, 0x70, 0x32, 0xd6, 0x4b, 0x21, 0x17, 0x03, 0xa6, 0x19, 0x17, 0x76, 0xfd, 0x00, 0xee, 0x02,
+	0x3a, 0x1f, 0xd4, 0x4a, 0x56, 0x40, 0x76, 0xa1, 0xfd, 0xcd, 0x08, 0x8b, 0x57, 0xf9, 0x6c, 0x86,
+	0x26, 0x08, 0xa0, 0x91, 0x89, 0x9f, 0x25, 0xc6, 0x7d, 0xf7, 0xce, 0x00, 0x28, 0xb2, 0xe4, 0x1f,
+	0x88, 0xd7, 0x70, 0x3a, 0x50, 0x52, 0x22, 0xb7, 0x42, 0x49, 0x8a, 0x79, 0x86, 0xc1, 0x33, 0x68,
+	0xa2, 0x64, 0xd3, 0xa5, 0x07, 0xb6, 0xe8, 0xe6, 0xd4, 0xfb, 0xdd, 0x80, 0xe6, 0xc0, 0x39, 0x1c,
+	0xbc, 0x87, 0x7a, 0x6a, 0x73, 0x37, 0x6f, 0xf7, 0xcf, 0xc9, 0xa3, 0x4e, 0x93, 0x51, 0x3c, 0xa6,
+	0x05, 0xa5, 0x60, 0x5a, 0x2b, 0xc2, 0x83, 0xca, 0xcc, 0x38, 0x1e, 0xd2, 0x82, 0x12, 0xdc, 0xc0,
+	0x69, 0xee, 0x0c, 0x9c, 0xf0, 0x8d, 0x2f, 0x61, 0xdd, 0xa9, 0xbc, 0xab, 0xa0, 0x72, 0xdf, 0x7a,
+	0x7a, 0x92, 0xdf, 0x8f, 0xe2, 0x3b, 0x3c, 0x49, 0x36, 0xa6, 0x6f, 0xd5, 0x1b, 0x4e, 0xfd, 0xb2,
+	0x82, 0xfa, 0x7e, 0x60, 0xb4, 0x93, 0xec, 0x47, 0xf8, 0x12, 0x80, 0x2b, 0x39, 0xc7, 0xac, 0xf0,
+	0x39, 0x3c, 0x74, 0xc6, 0xee, 0xfc, 0x09, 0xbe, 0xc0, 0xd1, 0xaa, 0x08, 0x73, 0x32, 0x75, 0x59,
+	0x85, 0x4d, 0x77, 0x39, 0xa9, 0x70, 0xf9, 0xce, 0x0e, 0xd0, 0xf6, 0x6a, 0x67, 0x21, 0x3e, 0x41,
+	0xdb, 0x20, 0x4b, 0x4a, 0xc5, 0xff, 0x9c, 0xe2, 0x9b, 0x0a, 0x8a, 0xdb, 0x95, 0xa1, 0x60, 0xb6,
+	0xeb, 0x73, 0x0d, 0xc7, 0x3f, 0x90, 0x25, 0x68, 0x26, 0xbe, 0x67, 0x61, 0xeb, 0xef, 0x10, 0x7d,
+	0x83, 0x88, 0x6f, 0x10, 0x89, 0x8b, 0x06, 0x8d, 0x7c, 0x81, 0xe8, 0x91, 0x27, 0xfb, 0x0d, 0xfa,
+	0xd8, 0x68, 0xfd, 0xdf, 0x81, 0x2b, 0x0a, 0xaf, 0xb8, 0x4a, 0x1f, 0x7f, 0xd2, 0xe7, 0xda, 0x4d,
+	0x7d, 0xc1, 0xf5, 0xaf, 0x83, 0xee, 0xd7, 0x3e, 0x65, 0x6b, 0x32, 0x28, 0xa0, 0xf1, 0x1d, 0x74,
+	0x58, 0x42, 0xaf, 0xb9, 0x9e, 0x36, 0x5d, 0x53, 0x2f, 0xff, 0x04, 0x00, 0x00, 0xff, 0xff, 0x54,
+	0xdd, 0xba, 0xf9, 0x34, 0x04, 0x00, 0x00,
 }
diff --git a/transport/internet/kcp/config.proto b/transport/internet/kcp/config.proto
index 41658be80..b6f61ab47 100644
--- a/transport/internet/kcp/config.proto
+++ b/transport/internet/kcp/config.proto
@@ -51,5 +51,5 @@ message Config {
   WriteBuffer write_buffer = 6;
   ReadBuffer read_buffer = 7;
   v2ray.core.common.serial.TypedMessage header_config = 8;
-  ConnectionReuse connection_reuse = 9;
+  reserved 9;
 }
\ No newline at end of file
diff --git a/transport/internet/kcp/connection.go b/transport/internet/kcp/connection.go
index baedeb0b1..d59b162ad 100644
--- a/transport/internet/kcp/connection.go
+++ b/transport/internet/kcp/connection.go
@@ -10,7 +10,6 @@ import (
 	"v2ray.com/core/app/log"
 	"v2ray.com/core/common/errors"
 	"v2ray.com/core/common/predicate"
-	"v2ray.com/core/transport/internet/internal"
 )
 
 var (
@@ -165,21 +164,19 @@ func (u *Updater) SetInterval(d time.Duration) {
 
 type SystemConnection interface {
 	net.Conn
-	Id() internal.ConnectionID
 	Reset(func([]Segment))
 	Overhead() int
 }
 
 // Connection is a KCP connection over UDP.
 type Connection struct {
-	conn         SystemConnection
-	connRecycler internal.ConnectionRecyler
-	rd           time.Time
-	wd           time.Time // write deadline
-	since        int64
-	dataInput    chan bool
-	dataOutput   chan bool
-	Config       *Config
+	conn       SystemConnection
+	rd         time.Time
+	wd         time.Time // write deadline
+	since      int64
+	dataInput  chan bool
+	dataOutput chan bool
+	Config     *Config
 
 	conv             uint16
 	state            State
@@ -197,24 +194,21 @@ type Connection struct {
 
 	dataUpdater *Updater
 	pingUpdater *Updater
-
-	reusable bool
 }
 
 // NewConnection create a new KCP connection between local and remote.
-func NewConnection(conv uint16, sysConn SystemConnection, recycler internal.ConnectionRecyler, config *Config) *Connection {
+func NewConnection(conv uint16, sysConn SystemConnection, config *Config) *Connection {
 	log.Trace(errors.New("KCP|Connection: creating connection ", conv))
 
 	conn := &Connection{
-		conv:         conv,
-		conn:         sysConn,
-		connRecycler: recycler,
-		since:        nowMillisec(),
-		dataInput:    make(chan bool, 1),
-		dataOutput:   make(chan bool, 1),
-		Config:       config,
-		output:       NewSegmentWriter(sysConn),
-		mss:          config.GetMTUValue() - uint32(sysConn.Overhead()) - DataSegmentOverhead,
+		conv:       conv,
+		conn:       sysConn,
+		since:      nowMillisec(),
+		dataInput:  make(chan bool, 1),
+		dataOutput: make(chan bool, 1),
+		Config:     config,
+		output:     NewSegmentWriter(sysConn),
+		mss:        config.GetMTUValue() - uint32(sysConn.Overhead()) - DataSegmentOverhead,
 		roundTrip: &RoundTripInfo{
 			rto:    100,
 			minRtt: config.GetTTIValue(),
@@ -443,14 +437,6 @@ func (v *Connection) updateTask() {
 	v.flush()
 }
 
-func (v *Connection) Reusable() bool {
-	return v.Config.IsConnectionReuse() && v.reusable
-}
-
-func (v *Connection) SetReusable(b bool) {
-	v.reusable = b
-}
-
 func (v *Connection) Terminate() {
 	if v == nil {
 		return
@@ -461,11 +447,7 @@ func (v *Connection) Terminate() {
 	v.OnDataInput()
 	v.OnDataOutput()
 
-	if v.Config.IsConnectionReuse() && v.reusable {
-		v.connRecycler.Put(v.conn.Id(), v.conn)
-	} else {
-		v.conn.Close()
-	}
+	v.conn.Close()
 	v.sendingWorker.Release()
 	v.receivingWorker.Release()
 }
diff --git a/transport/internet/kcp/connection_test.go b/transport/internet/kcp/connection_test.go
index 1c47b5acd..ae660622b 100644
--- a/transport/internet/kcp/connection_test.go
+++ b/transport/internet/kcp/connection_test.go
@@ -6,7 +6,6 @@ import (
 	"time"
 
 	"v2ray.com/core/testing/assert"
-	"v2ray.com/core/transport/internet/internal"
 	. "v2ray.com/core/transport/internet/kcp"
 )
 
@@ -48,20 +47,12 @@ func (o *NoOpConn) SetWriteDeadline(time.Time) error {
 	return nil
 }
 
-func (o *NoOpConn) Id() internal.ConnectionID {
-	return internal.ConnectionID{}
-}
-
 func (o *NoOpConn) Reset(input func([]Segment)) {}
 
-type NoOpRecycler struct{}
-
-func (o *NoOpRecycler) Put(internal.ConnectionID, net.Conn) {}
-
 func TestConnectionReadTimeout(t *testing.T) {
 	assert := assert.On(t)
 
-	conn := NewConnection(1, &NoOpConn{}, &NoOpRecycler{}, &Config{})
+	conn := NewConnection(1, &NoOpConn{}, &Config{})
 	conn.SetReadDeadline(time.Now().Add(time.Second))
 
 	b := make([]byte, 1024)
diff --git a/transport/internet/kcp/dialer.go b/transport/internet/kcp/dialer.go
index 40a2cbef6..63c3e37ed 100644
--- a/transport/internet/kcp/dialer.go
+++ b/transport/internet/kcp/dialer.go
@@ -15,19 +15,16 @@ import (
 	"v2ray.com/core/common/errors"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
 
 var (
 	globalConv = uint32(dice.RandomUint16())
-	globalPool = internal.NewConnectionPool()
 )
 
 type ClientConnection struct {
 	sync.RWMutex
 	net.Conn
-	id     internal.ConnectionID
 	input  func([]Segment)
 	reader PacketReader
 	writer PacketWriter
@@ -57,10 +54,6 @@ func (o *ClientConnection) Read([]byte) (int, error) {
 	panic("KCP|ClientConnection: Read should not be called.")
 }
 
-func (o *ClientConnection) Id() internal.ConnectionID {
-	return o.id
-}
-
 func (o *ClientConnection) Close() error {
 	return o.Conn.Close()
 }
@@ -114,25 +107,18 @@ func DialKCP(ctx context.Context, dest v2net.Destination) (internet.Connection,
 	log.Trace(errors.New("KCP|Dialer: Dialing KCP to ", dest))
 
 	src := internet.DialerSourceFromContext(ctx)
-	id := internal.NewConnectionID(src, dest)
-	conn := globalPool.Get(id)
-	if conn == nil {
-		rawConn, err := internet.DialSystem(ctx, src, dest)
-		if err != nil {
-			log.Trace(errors.New("KCP|Dialer: Failed to dial to dest: ", err).AtError())
-			return nil, err
-		}
-		c := &ClientConnection{
-			Conn: rawConn,
-			id:   id,
-		}
-		go c.Run()
-		conn = c
+	rawConn, err := internet.DialSystem(ctx, src, dest)
+	if err != nil {
+		log.Trace(errors.New("KCP|Dialer: Failed to dial to dest: ", err).AtError())
+		return nil, err
 	}
+	conn := &ClientConnection{
+		Conn: rawConn,
+	}
+	go conn.Run()
 
 	kcpSettings := internet.TransportSettingsFromContext(ctx).(*Config)
 
-	clientConn := conn.(*ClientConnection)
 	header, err := kcpSettings.GetPackerHeader()
 	if err != nil {
 		return nil, errors.New("KCP|Dialer: Failed to create packet header.").Base(err)
@@ -141,9 +127,9 @@ func DialKCP(ctx context.Context, dest v2net.Destination) (internet.Connection,
 	if err != nil {
 		return nil, errors.New("KCP|Dialer: Failed to create security.").Base(err)
 	}
-	clientConn.ResetSecurity(header, security)
+	conn.ResetSecurity(header, security)
 	conv := uint16(atomic.AddUint32(&globalConv, 1))
-	session := NewConnection(conv, clientConn, globalPool, kcpSettings)
+	session := NewConnection(conv, conn, kcpSettings)
 
 	var iConn internet.Connection
 	iConn = session
@@ -156,7 +142,7 @@ func DialKCP(ctx context.Context, dest v2net.Destination) (internet.Connection,
 				config.ServerName = dest.Address.Domain()
 			}
 			tlsConn := tls.Client(iConn, config)
-			iConn = UnreusableConnection{Conn: tlsConn}
+			iConn = tlsConn
 		}
 	}
 
diff --git a/transport/internet/kcp/listener.go b/transport/internet/kcp/listener.go
index 339cb5227..37beb9115 100644
--- a/transport/internet/kcp/listener.go
+++ b/transport/internet/kcp/listener.go
@@ -15,7 +15,6 @@ import (
 	"v2ray.com/core/common/errors"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 	"v2ray.com/core/transport/internet/udp"
 )
@@ -27,7 +26,6 @@ type ConnectionID struct {
 }
 
 type ServerConnection struct {
-	id     internal.ConnectionID
 	local  net.Addr
 	remote net.Addr
 	writer PacketWriter
@@ -73,10 +71,6 @@ func (*ServerConnection) SetWriteDeadline(time.Time) error {
 	return nil
 }
 
-func (c *ServerConnection) Id() internal.ConnectionID {
-	return c.id
-}
-
 // Listener defines a server listening for connections
 type Listener struct {
 	sync.Mutex
@@ -94,7 +88,6 @@ type Listener struct {
 func NewListener(ctx context.Context, address v2net.Address, port v2net.Port, conns chan<- internet.Connection) (*Listener, error) {
 	networkSettings := internet.TransportSettingsFromContext(ctx)
 	kcpSettings := networkSettings.(*Config)
-	kcpSettings.ConnectionReuse = &ConnectionReuse{Enable: false}
 
 	header, err := kcpSettings.GetPackerHeader()
 	if err != nil {
@@ -182,7 +175,6 @@ func (v *Listener) OnReceive(payload *buf.Buffer, src v2net.Destination, origina
 		}
 		localAddr := v.hub.Addr()
 		sConn := &ServerConnection{
-			id:     internal.NewConnectionID(v2net.LocalHostIP, src),
 			local:  localAddr,
 			remote: remoteAddr,
 			writer: &KCPPacketWriter{
@@ -192,17 +184,16 @@ func (v *Listener) OnReceive(payload *buf.Buffer, src v2net.Destination, origina
 			},
 			closer: writer,
 		}
-		conn = NewConnection(conv, sConn, v, v.config)
+		conn = NewConnection(conv, sConn, v.config)
 		var netConn internet.Connection = conn
 		if v.tlsConfig != nil {
 			tlsConn := tls.Server(conn, v.tlsConfig)
-			netConn = UnreusableConnection{Conn: tlsConn}
+			netConn = tlsConn
 		}
 
 		select {
 		case v.conns <- netConn:
 		case <-time.After(time.Second * 5):
-			conn.SetReusable(false)
 			conn.Close()
 			return
 		}
@@ -248,8 +239,6 @@ func (v *Listener) Addr() net.Addr {
 	return v.hub.Addr()
 }
 
-func (v *Listener) Put(internal.ConnectionID, net.Conn) {}
-
 type Writer struct {
 	id       ConnectionID
 	dest     v2net.Destination
diff --git a/transport/internet/kcp/tls.go b/transport/internet/kcp/tls.go
deleted file mode 100644
index 3d036dd6a..000000000
--- a/transport/internet/kcp/tls.go
+++ /dev/null
@@ -1,13 +0,0 @@
-package kcp
-
-import "net"
-
-type UnreusableConnection struct {
-	net.Conn
-}
-
-func (c UnreusableConnection) Reusable() bool {
-	return false
-}
-
-func (c UnreusableConnection) SetReusable(bool) {}
diff --git a/transport/internet/tcp/config.go b/transport/internet/tcp/config.go
index 021b974b3..cd8cc0f79 100644
--- a/transport/internet/tcp/config.go
+++ b/transport/internet/tcp/config.go
@@ -5,13 +5,6 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
-func (v *Config) IsConnectionReuse() bool {
-	if v == nil || v.ConnectionReuse == nil {
-		return true
-	}
-	return v.ConnectionReuse.Enable
-}
-
 func init() {
 	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_TCP, func() interface{} {
 		return new(Config)
diff --git a/transport/internet/tcp/config.pb.go b/transport/internet/tcp/config.pb.go
index ac022e965..08d1fc565 100644
--- a/transport/internet/tcp/config.pb.go
+++ b/transport/internet/tcp/config.pb.go
@@ -16,38 +16,14 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
 
-type ConnectionReuse struct {
-	Enable bool `protobuf:"varint,1,opt,name=enable" json:"enable,omitempty"`
-}
-
-func (m *ConnectionReuse) Reset()                    { *m = ConnectionReuse{} }
-func (m *ConnectionReuse) String() string            { return proto.CompactTextString(m) }
-func (*ConnectionReuse) ProtoMessage()               {}
-func (*ConnectionReuse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
-
-func (m *ConnectionReuse) GetEnable() bool {
-	if m != nil {
-		return m.Enable
-	}
-	return false
-}
-
 type Config struct {
-	ConnectionReuse *ConnectionReuse                       `protobuf:"bytes,1,opt,name=connection_reuse,json=connectionReuse" json:"connection_reuse,omitempty"`
-	HeaderSettings  *v2ray_core_common_serial.TypedMessage `protobuf:"bytes,2,opt,name=header_settings,json=headerSettings" json:"header_settings,omitempty"`
+	HeaderSettings *v2ray_core_common_serial.TypedMessage `protobuf:"bytes,2,opt,name=header_settings,json=headerSettings" json:"header_settings,omitempty"`
 }
 
 func (m *Config) Reset()                    { *m = Config{} }
 func (m *Config) String() string            { return proto.CompactTextString(m) }
 func (*Config) ProtoMessage()               {}
-func (*Config) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
-
-func (m *Config) GetConnectionReuse() *ConnectionReuse {
-	if m != nil {
-		return m.ConnectionReuse
-	}
-	return nil
-}
+func (*Config) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
 
 func (m *Config) GetHeaderSettings() *v2ray_core_common_serial.TypedMessage {
 	if m != nil {
@@ -57,30 +33,25 @@ func (m *Config) GetHeaderSettings() *v2ray_core_common_serial.TypedMessage {
 }
 
 func init() {
-	proto.RegisterType((*ConnectionReuse)(nil), "v2ray.core.transport.internet.tcp.ConnectionReuse")
 	proto.RegisterType((*Config)(nil), "v2ray.core.transport.internet.tcp.Config")
 }
 
 func init() { proto.RegisterFile("v2ray.com/core/transport/internet/tcp/config.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 273 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x84, 0x90, 0xc1, 0x4a, 0xf4, 0x30,
-	0x14, 0x85, 0xe9, 0xfc, 0x50, 0x7e, 0x22, 0x58, 0xe9, 0x42, 0x06, 0x57, 0xce, 0x80, 0xa2, 0x9b,
-	0x44, 0xea, 0x1b, 0xd8, 0x95, 0x0b, 0x51, 0x62, 0x71, 0x21, 0x48, 0xc9, 0xdc, 0xb9, 0xd6, 0xc2,
-	0x34, 0x37, 0x24, 0x57, 0xa1, 0xaf, 0xe4, 0x13, 0xf8, 0x78, 0xd2, 0x76, 0x5a, 0xa4, 0x9b, 0x59,
-	0x06, 0xbe, 0xef, 0xe4, 0x9c, 0x2b, 0xb2, 0xaf, 0xcc, 0x9b, 0x56, 0x02, 0x35, 0x0a, 0xc8, 0xa3,
-	0x62, 0x6f, 0x6c, 0x70, 0xe4, 0x59, 0xd5, 0x96, 0xd1, 0x5b, 0x64, 0xc5, 0xe0, 0x14, 0x90, 0x7d,
-	0xaf, 0x2b, 0xe9, 0x3c, 0x31, 0xa5, 0xab, 0xd1, 0xf1, 0x28, 0x27, 0x5e, 0x8e, 0xbc, 0x64, 0x70,
-	0x67, 0x37, 0xb3, 0x58, 0xa0, 0xa6, 0x21, 0xab, 0x02, 0xfa, 0xda, 0xec, 0x14, 0xb7, 0x0e, 0xb7,
-	0x65, 0x83, 0x21, 0x98, 0x0a, 0x87, 0xd0, 0xf5, 0xb5, 0x48, 0x72, 0xb2, 0x16, 0x81, 0x6b, 0xb2,
-	0x1a, 0x3f, 0x03, 0xa6, 0xa7, 0x22, 0x46, 0x6b, 0x36, 0x3b, 0x5c, 0x46, 0xe7, 0xd1, 0xd5, 0x7f,
-	0xbd, 0x7f, 0xad, 0x7f, 0x22, 0x11, 0xe7, 0x7d, 0xa1, 0xf4, 0x4d, 0x9c, 0xc0, 0x64, 0x95, 0xbe,
-	0xd3, 0x7a, 0xf8, 0x28, 0xcb, 0xe4, 0xc1, 0x96, 0x72, 0xf6, 0xa1, 0x4e, 0x60, 0xd6, 0xe0, 0x51,
-	0x24, 0x1f, 0x68, 0xb6, 0xe8, 0xcb, 0x80, 0xcc, 0xb5, 0xad, 0xc2, 0x72, 0xd1, 0xa7, 0x5f, 0xfe,
-	0x4d, 0x1f, 0xc6, 0xc9, 0x61, 0x9c, 0x2c, 0xba, 0x71, 0x0f, 0xc3, 0x36, 0x7d, 0x3c, 0xe8, 0xcf,
-	0x7b, 0xfb, 0x4e, 0x8b, 0x0b, 0xa0, 0xe6, 0x70, 0xb5, 0xa7, 0xe8, 0xf5, 0x1f, 0x83, 0xfb, 0x5e,
-	0xac, 0x5e, 0x32, 0x6d, 0x5a, 0x99, 0x77, 0x68, 0x31, 0xa1, 0xf7, 0x23, 0x5a, 0x80, 0xdb, 0xc4,
-	0xfd, 0x01, 0x6f, 0x7f, 0x03, 0x00, 0x00, 0xff, 0xff, 0x17, 0x2c, 0x8e, 0x55, 0xcb, 0x01, 0x00,
-	0x00,
+	// 223 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x84, 0x8e, 0xc1, 0x4a, 0xc4, 0x30,
+	0x10, 0x86, 0x69, 0x95, 0x45, 0x2a, 0xa8, 0xec, 0x49, 0x3c, 0xb9, 0x82, 0xe2, 0x69, 0x22, 0xf1,
+	0x0d, 0xdc, 0x93, 0x82, 0x28, 0xb5, 0x78, 0xf0, 0x52, 0xe2, 0xec, 0x58, 0x03, 0x26, 0x13, 0x26,
+	0x83, 0xd0, 0x57, 0xf2, 0x29, 0x65, 0x37, 0x76, 0x11, 0x2f, 0xde, 0xbf, 0xef, 0xfb, 0xff, 0xc6,
+	0x7e, 0x5a, 0x71, 0x23, 0x20, 0x07, 0x83, 0x2c, 0x64, 0x54, 0x5c, 0xcc, 0x89, 0x45, 0x8d, 0x8f,
+	0x4a, 0x12, 0x49, 0x8d, 0x62, 0x32, 0xc8, 0xf1, 0xcd, 0x0f, 0x90, 0x84, 0x95, 0xe7, 0x8b, 0xc9,
+	0x11, 0x82, 0x2d, 0x0f, 0x13, 0x0f, 0x8a, 0xe9, 0xe4, 0xea, 0x4f, 0x16, 0x39, 0x04, 0x8e, 0x26,
+	0x93, 0x78, 0xf7, 0x61, 0x74, 0x4c, 0xb4, 0xea, 0x03, 0xe5, 0xec, 0x06, 0x2a, 0xd1, 0xb3, 0xbe,
+	0x99, 0x2d, 0x37, 0x23, 0xf3, 0x87, 0xe6, 0xf0, 0x9d, 0xdc, 0x8a, 0xa4, 0xcf, 0xa4, 0xea, 0xe3,
+	0x90, 0x8f, 0xeb, 0xd3, 0xea, 0x72, 0xdf, 0x5e, 0xc0, 0xaf, 0xe1, 0x52, 0x84, 0x52, 0x84, 0x6e,
+	0x5d, 0xbc, 0x2f, 0xc1, 0xf6, 0xa0, 0xe8, 0x4f, 0x3f, 0xf6, 0xdd, 0xee, 0x5e, 0x75, 0x54, 0xdf,
+	0xb4, 0xcd, 0x39, 0x72, 0x80, 0x7f, 0xbf, 0x3f, 0x56, 0x2f, 0x3b, 0x8a, 0xe9, 0xab, 0x5e, 0x3c,
+	0xdb, 0xd6, 0x8d, 0xb0, 0x5c, 0xa3, 0xdd, 0x16, 0xbd, 0x9d, 0xd0, 0x0e, 0xd3, 0xeb, 0x6c, 0xf3,
+	0xfd, 0xfa, 0x3b, 0x00, 0x00, 0xff, 0xff, 0x15, 0xf9, 0x1f, 0xa0, 0x46, 0x01, 0x00, 0x00,
 }
diff --git a/transport/internet/tcp/config.proto b/transport/internet/tcp/config.proto
index 37479f5ac..dadfb5938 100644
--- a/transport/internet/tcp/config.proto
+++ b/transport/internet/tcp/config.proto
@@ -8,10 +8,7 @@ option java_multiple_files = true;
 
 import "v2ray.com/core/common/serial/typed_message.proto";
 
-message ConnectionReuse {
-  bool enable = 1;
-}
 message Config {
-  ConnectionReuse connection_reuse = 1;
+  reserved 1;
   v2ray.core.common.serial.TypedMessage header_settings = 2;
 }
\ No newline at end of file
diff --git a/transport/internet/tcp/dialer.go b/transport/internet/tcp/dialer.go
index de9f823c8..b59afb3c6 100644
--- a/transport/internet/tcp/dialer.go
+++ b/transport/internet/tcp/dialer.go
@@ -3,61 +3,47 @@ package tcp
 import (
 	"context"
 	"crypto/tls"
-	"net"
 
 	"v2ray.com/core/app/log"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/errors"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
 
-var (
-	globalCache = internal.NewConnectionPool()
-)
-
 func Dial(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
 	log.Trace(errors.New("Internet|TCP: Dailing TCP to ", dest))
 	src := internet.DialerSourceFromContext(ctx)
 
 	tcpSettings := internet.TransportSettingsFromContext(ctx).(*Config)
 
-	id := internal.NewConnectionID(src, dest)
-	var conn net.Conn
-	if dest.Network == v2net.Network_TCP && tcpSettings.IsConnectionReuse() {
-		conn = globalCache.Get(id)
+	conn, err := internet.DialSystem(ctx, src, dest)
+	if err != nil {
+		return nil, err
 	}
-	if conn == nil {
-		var err error
-		conn, err = internet.DialSystem(ctx, src, dest)
+	if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil {
+		tlsConfig, ok := securitySettings.(*v2tls.Config)
+		if ok {
+			config := tlsConfig.GetTLSConfig()
+			if dest.Address.Family().IsDomain() {
+				config.ServerName = dest.Address.Domain()
+			}
+			conn = tls.Client(conn, config)
+		}
+	}
+	if tcpSettings.HeaderSettings != nil {
+		headerConfig, err := tcpSettings.HeaderSettings.GetInstance()
 		if err != nil {
-			return nil, err
+			return nil, errors.New("Internet|TCP: Failed to get header settings.").Base(err)
 		}
-		if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil {
-			tlsConfig, ok := securitySettings.(*v2tls.Config)
-			if ok {
-				config := tlsConfig.GetTLSConfig()
-				if dest.Address.Family().IsDomain() {
-					config.ServerName = dest.Address.Domain()
-				}
-				conn = tls.Client(conn, config)
-			}
-		}
-		if tcpSettings.HeaderSettings != nil {
-			headerConfig, err := tcpSettings.HeaderSettings.GetInstance()
-			if err != nil {
-				return nil, errors.New("Internet|TCP: Failed to get header settings.").Base(err)
-			}
-			auth, err := internet.CreateConnectionAuthenticator(headerConfig)
-			if err != nil {
-				return nil, errors.New("Internet|TCP: Failed to create header authenticator.").Base(err)
-			}
-			conn = auth.Client(conn)
+		auth, err := internet.CreateConnectionAuthenticator(headerConfig)
+		if err != nil {
+			return nil, errors.New("Internet|TCP: Failed to create header authenticator.").Base(err)
 		}
+		conn = auth.Client(conn)
 	}
-	return internal.NewConnection(id, conn, globalCache, internal.ReuseConnection(tcpSettings.IsConnectionReuse())), nil
+	return internet.Connection(conn), nil
 }
 
 func init() {
diff --git a/transport/internet/tcp/hub.go b/transport/internet/tcp/hub.go
index 43ec711bf..b21177478 100644
--- a/transport/internet/tcp/hub.go
+++ b/transport/internet/tcp/hub.go
@@ -12,7 +12,6 @@ import (
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/common/retry"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
 
@@ -97,23 +96,13 @@ func (v *TCPListener) KeepAccepting() {
 		}
 
 		select {
-		case v.conns <- internal.NewConnection(internal.ConnectionID{}, conn, v, internal.ReuseConnection(v.config.IsConnectionReuse())):
+		case v.conns <- internet.Connection(conn):
 		case <-time.After(time.Second * 5):
 			conn.Close()
 		}
 	}
 }
 
-func (v *TCPListener) Put(id internal.ConnectionID, conn net.Conn) {
-	select {
-	case v.conns <- internal.NewConnection(internal.ConnectionID{}, conn, v, internal.ReuseConnection(v.config.IsConnectionReuse())):
-	case <-time.After(time.Second * 5):
-		conn.Close()
-	case <-v.ctx.Done():
-		conn.Close()
-	}
-}
-
 func (v *TCPListener) Addr() net.Addr {
 	return v.listener.Addr()
 }
diff --git a/transport/internet/udp/dialer.go b/transport/internet/udp/dialer.go
index e70220f36..18557c1ed 100644
--- a/transport/internet/udp/dialer.go
+++ b/transport/internet/udp/dialer.go
@@ -6,7 +6,6 @@ import (
 	"v2ray.com/core/common"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 )
 
 func init() {
@@ -18,6 +17,6 @@ func init() {
 				return nil, err
 			}
 			// TODO: handle dialer options
-			return internal.NewConnection(internal.NewConnectionID(src, dest), conn, internal.NoOpConnectionRecyler{}, internal.ReuseConnection(false)), nil
+			return internet.Connection(conn), nil
 		}))
 }
diff --git a/transport/internet/websocket/config.go b/transport/internet/websocket/config.go
index 93a8ad07a..4082f4fde 100644
--- a/transport/internet/websocket/config.go
+++ b/transport/internet/websocket/config.go
@@ -5,13 +5,6 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
-func (c *Config) IsConnectionReuse() bool {
-	if c == nil || c.ConnectionReuse == nil {
-		return true
-	}
-	return c.ConnectionReuse.Enable
-}
-
 func (c *Config) GetNormailzedPath() string {
 	path := c.Path
 	if len(path) == 0 {
diff --git a/transport/internet/websocket/config.pb.go b/transport/internet/websocket/config.pb.go
index 670af4046..c2a6abaf1 100644
--- a/transport/internet/websocket/config.pb.go
+++ b/transport/internet/websocket/config.pb.go
@@ -32,8 +32,6 @@ func (m *ConnectionReuse) GetEnable() bool {
 }
 
 type Config struct {
-	// Whether or not to reuse WebSocket connections.
-	ConnectionReuse *ConnectionReuse `protobuf:"bytes,1,opt,name=connection_reuse,json=connectionReuse" json:"connection_reuse,omitempty"`
 	// URL path to the WebSocket service. Empty value means root(/).
 	Path string `protobuf:"bytes,2,opt,name=path" json:"path,omitempty"`
 }
@@ -43,13 +41,6 @@ func (m *Config) String() string            { return proto.CompactTextString(m)
 func (*Config) ProtoMessage()               {}
 func (*Config) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
 
-func (m *Config) GetConnectionReuse() *ConnectionReuse {
-	if m != nil {
-		return m.ConnectionReuse
-	}
-	return nil
-}
-
 func (m *Config) GetPath() string {
 	if m != nil {
 		return m.Path
@@ -67,20 +58,18 @@ func init() {
 }
 
 var fileDescriptor0 = []byte{
-	// 226 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0xd0, 0xb1, 0x4a, 0x03, 0x41,
-	0x10, 0x80, 0x61, 0x36, 0xc8, 0x61, 0xd6, 0x22, 0x72, 0x85, 0xa4, 0x0c, 0x69, 0x12, 0x11, 0x76,
-	0xe1, 0x6c, 0x52, 0x7b, 0x95, 0x9d, 0x2c, 0xa2, 0x60, 0x23, 0x7b, 0xe3, 0xa8, 0x87, 0x66, 0xe6,
-	0x98, 0x1b, 0x95, 0x94, 0xbe, 0x8e, 0x4f, 0x29, 0x39, 0xb2, 0x5b, 0xa4, 0xba, 0x6e, 0x07, 0xe6,
-	0xe3, 0x5f, 0xc6, 0x6e, 0xbe, 0x2b, 0x89, 0x3b, 0x07, 0xbc, 0xf5, 0xc0, 0x82, 0x5e, 0x25, 0x52,
-	0xdf, 0xb1, 0xa8, 0x6f, 0x49, 0x51, 0x08, 0xd5, 0xff, 0x60, 0xd3, 0x33, 0x7c, 0xa0, 0x7a, 0x60,
-	0x7a, 0x6d, 0xdf, 0x5c, 0x27, 0xac, 0x5c, 0xae, 0x92, 0x14, 0x74, 0x59, 0xb9, 0xa4, 0x5c, 0x56,
-	0xcb, 0x4b, 0x3b, 0xab, 0x99, 0x08, 0x41, 0x5b, 0xa6, 0x80, 0x5f, 0x3d, 0x96, 0x17, 0xb6, 0x40,
-	0x8a, 0xcd, 0x27, 0xce, 0xcd, 0xc2, 0xac, 0x4f, 0xc3, 0x61, 0x5a, 0xfe, 0x1a, 0x5b, 0xd4, 0x43,
-	0xa4, 0x04, 0x7b, 0x0e, 0x59, 0x3d, 0xcb, 0x9e, 0x0d, 0xcb, 0x67, 0xd5, 0xc6, 0x8d, 0x2c, 0xbb,
-	0xa3, 0x6c, 0x98, 0xc1, 0xd1, 0x3f, 0x4a, 0x7b, 0xd2, 0x45, 0x7d, 0x9f, 0x4f, 0x16, 0x66, 0x3d,
-	0x0d, 0xc3, 0xfb, 0xe6, 0xc5, 0x5e, 0x01, 0x6f, 0xc7, 0x36, 0xee, 0xcc, 0xd3, 0x34, 0x0f, 0x7f,
-	0x93, 0xd5, 0x43, 0x15, 0xe2, 0xce, 0xd5, 0x7b, 0x76, 0x9f, 0xd9, 0x6d, 0x62, 0x8f, 0x69, 0xb3,
-	0x29, 0x86, 0x23, 0x5e, 0xff, 0x07, 0x00, 0x00, 0xff, 0xff, 0x22, 0x65, 0x99, 0x41, 0x80, 0x01,
-	0x00, 0x00,
+	// 204 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0xcf, 0x31, 0x4b, 0xc7, 0x30,
+	0x10, 0x05, 0x70, 0x52, 0xfe, 0x94, 0x36, 0x8b, 0x92, 0x41, 0x3a, 0x96, 0x2e, 0xad, 0x08, 0x09,
+	0xd4, 0xc5, 0xd9, 0x4e, 0x3a, 0x49, 0x10, 0x05, 0xb7, 0x34, 0x9e, 0x5a, 0xb4, 0x77, 0x25, 0x3d,
+	0x95, 0x7e, 0x25, 0x3f, 0xa5, 0x58, 0x4c, 0xe6, 0xff, 0x76, 0x0f, 0xee, 0xc7, 0xe3, 0xc9, 0xab,
+	0xaf, 0x3e, 0xb8, 0x4d, 0x7b, 0x9a, 0x8d, 0xa7, 0x00, 0x86, 0x83, 0xc3, 0x75, 0xa1, 0xc0, 0x66,
+	0x42, 0x86, 0x80, 0xc0, 0xe6, 0x1b, 0xc6, 0x95, 0xfc, 0x3b, 0xb0, 0xf1, 0x84, 0x2f, 0xd3, 0xab,
+	0x5e, 0x02, 0x31, 0xa9, 0x36, 0xca, 0x00, 0x3a, 0x29, 0x1d, 0x95, 0x4e, 0xaa, 0x39, 0x97, 0x27,
+	0x03, 0x21, 0x82, 0xe7, 0x89, 0xd0, 0xc2, 0xe7, 0x0a, 0xea, 0x4c, 0xe6, 0x80, 0x6e, 0xfc, 0x80,
+	0x4a, 0xd4, 0xa2, 0x2b, 0xec, 0x7f, 0x6a, 0x1a, 0x99, 0x0f, 0x7b, 0x87, 0x52, 0xf2, 0xb0, 0x38,
+	0x7e, 0xab, 0xb2, 0x5a, 0x74, 0xa5, 0xdd, 0xef, 0xdb, 0x43, 0x21, 0x4e, 0xb3, 0xeb, 0x67, 0x79,
+	0xe1, 0x69, 0xd6, 0x47, 0xb6, 0xdf, 0x89, 0xa7, 0x32, 0x85, 0x9f, 0xac, 0x7d, 0xe8, 0xad, 0xdb,
+	0xf4, 0xf0, 0xc7, 0xee, 0x13, 0xbb, 0x89, 0xec, 0x31, 0x7e, 0x8e, 0xf9, 0x3e, 0xf2, 0xf2, 0x37,
+	0x00, 0x00, 0xff, 0xff, 0x7a, 0xf3, 0x2b, 0x77, 0x20, 0x01, 0x00, 0x00,
 }
diff --git a/transport/internet/websocket/config.proto b/transport/internet/websocket/config.proto
index 3de9c63f5..ebf47dbf4 100644
--- a/transport/internet/websocket/config.proto
+++ b/transport/internet/websocket/config.proto
@@ -11,8 +11,7 @@ message ConnectionReuse {
 }
 
 message Config {
-  // Whether or not to reuse WebSocket connections.
-  ConnectionReuse connection_reuse = 1;
+  reserved 1;
 
   // URL path to the WebSocket service. Empty value means root(/).
   string path = 2;
diff --git a/transport/internet/websocket/dialer.go b/transport/internet/websocket/dialer.go
index db8617e10..15f7cd209 100644
--- a/transport/internet/websocket/dialer.go
+++ b/transport/internet/websocket/dialer.go
@@ -10,32 +10,17 @@ import (
 	"v2ray.com/core/common/errors"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
 
-var (
-	globalCache = internal.NewConnectionPool()
-)
-
 func Dial(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
-	log.Trace(errors.New("WebSocket|Dialer: Creating connection to ", dest))
-	src := internet.DialerSourceFromContext(ctx)
-	wsSettings := internet.TransportSettingsFromContext(ctx).(*Config)
+	log.Trace(errors.New("creating connection to ", dest).Path("Transport", "Internet", "WebSocket"))
 
-	id := internal.NewConnectionID(src, dest)
-	var conn net.Conn
-	if dest.Network == v2net.Network_TCP && wsSettings.IsConnectionReuse() {
-		conn = globalCache.Get(id)
+	conn, err := dialWebsocket(ctx, dest)
+	if err != nil {
+		return nil, errors.New("dial failed").Path("WebSocket", "Dialer")
 	}
-	if conn == nil {
-		var err error
-		conn, err = dialWebsocket(ctx, dest)
-		if err != nil {
-			return nil, errors.New("dial failed").Path("WebSocket", "Dialer")
-		}
-	}
-	return internal.NewConnection(id, conn, globalCache, internal.ReuseConnection(wsSettings.IsConnectionReuse())), nil
+	return internet.Connection(conn), nil
 }
 
 func init() {
diff --git a/transport/internet/websocket/hub.go b/transport/internet/websocket/hub.go
index 49b4d0052..c20e9c463 100644
--- a/transport/internet/websocket/hub.go
+++ b/transport/internet/websocket/hub.go
@@ -15,7 +15,6 @@ import (
 	"v2ray.com/core/common/errors"
 	v2net "v2ray.com/core/common/net"
 	"v2ray.com/core/transport/internet"
-	"v2ray.com/core/transport/internet/internal"
 	v2tls "v2ray.com/core/transport/internet/tls"
 )
 
@@ -42,7 +41,7 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 	select {
 	case <-h.ln.ctx.Done():
 		conn.Close()
-	case h.ln.conns <- internal.NewConnection(internal.ConnectionID{}, conn, h.ln, internal.ReuseConnection(h.ln.config.IsConnectionReuse())):
+	case h.ln.conns <- internet.Connection(conn):
 	case <-time.After(time.Second * 5):
 		conn.Close()
 	}
@@ -120,16 +119,6 @@ func converttovws(w http.ResponseWriter, r *http.Request) (*connection, error) {
 	return &connection{wsc: conn}, nil
 }
 
-func (ln *Listener) Put(id internal.ConnectionID, conn net.Conn) {
-	select {
-	case <-ln.ctx.Done():
-		conn.Close()
-	case ln.conns <- internal.NewConnection(internal.ConnectionID{}, conn, ln, internal.ReuseConnection(ln.config.IsConnectionReuse())):
-	case <-time.After(time.Second * 5):
-		conn.Close()
-	}
-}
-
 func (ln *Listener) Addr() net.Addr {
 	return ln.listener.Addr()
 }
diff --git a/transport/internet/websocket/ws_test.go b/transport/internet/websocket/ws_test.go
index 6a8f0689b..8e106ed31 100644
--- a/transport/internet/websocket/ws_test.go
+++ b/transport/internet/websocket/ws_test.go
@@ -30,7 +30,6 @@ func Test_listenWSAndDial(t *testing.T) {
 				n, err := c.Read(b[:])
 				//assert.Error(err).IsNil()
 				if err != nil {
-					c.SetReusable(false)
 					return
 				}
 				assert.Bool(bytes.HasPrefix(b[:n], []byte("Test connection"))).IsTrue()
@@ -87,9 +86,6 @@ func Test_listenWSAndDial_TLS(t *testing.T) {
 
 	ctx := internet.ContextWithTransportSettings(context.Background(), &Config{
 		Path: "wss",
-		ConnectionReuse: &ConnectionReuse{
-			Enable: true,
-		},
 	})
 	ctx = internet.ContextWithSecuritySettings(ctx, &v2tls.Config{
 		AllowInsecure: true,