diff --git a/common/mux/client.go b/common/mux/client.go
index 4be9915d..f94675d1 100644
--- a/common/mux/client.go
+++ b/common/mux/client.go
@@ -43,7 +43,7 @@ func NewClient(ctx context.Context, dialer N.Dialer, protocol Protocol, maxConne
 
 func NewClientWithOptions(ctx context.Context, dialer N.Dialer, options option.MultiplexOptions) (N.Dialer, error) {
 	if !options.Enabled {
-		return dialer, nil
+		return nil, nil
 	}
 	if options.MaxConnections == 0 && options.MaxStreams == 0 {
 		options.MinStreams = 8
diff --git a/common/mux/protocol.go b/common/mux/protocol.go
index 95baccb2..80ce2898 100644
--- a/common/mux/protocol.go
+++ b/common/mux/protocol.go
@@ -23,18 +23,18 @@ var Destination = M.Socksaddr{
 }
 
 const (
-	ProtocolYAMux Protocol = 0
-	ProtocolSMux  Protocol = 1
+	ProtocolSMux Protocol = iota
+	ProtocolYAMux
 )
 
 type Protocol byte
 
 func ParseProtocol(name string) (Protocol, error) {
 	switch name {
-	case "", "yamux":
-		return ProtocolYAMux, nil
-	case "smux":
+	case "", "smux":
 		return ProtocolSMux, nil
+	case "yamux":
+		return ProtocolYAMux, nil
 	default:
 		return ProtocolYAMux, E.New("unknown multiplex protocol: ", name)
 	}
@@ -42,14 +42,14 @@ func ParseProtocol(name string) (Protocol, error) {
 
 func (p Protocol) newServer(conn net.Conn) (abstractSession, error) {
 	switch p {
-	case ProtocolYAMux:
-		return yamux.Server(conn, yaMuxConfig())
 	case ProtocolSMux:
 		session, err := smux.Server(conn, nil)
 		if err != nil {
 			return nil, err
 		}
 		return &smuxSession{session}, nil
+	case ProtocolYAMux:
+		return yamux.Server(conn, yaMuxConfig())
 	default:
 		panic("unknown protocol")
 	}
@@ -57,14 +57,14 @@ func (p Protocol) newServer(conn net.Conn) (abstractSession, error) {
 
 func (p Protocol) newClient(conn net.Conn) (abstractSession, error) {
 	switch p {
-	case ProtocolYAMux:
-		return yamux.Client(conn, yaMuxConfig())
 	case ProtocolSMux:
 		session, err := smux.Client(conn, nil)
 		if err != nil {
 			return nil, err
 		}
 		return &smuxSession{session}, nil
+	case ProtocolYAMux:
+		return yamux.Client(conn, yaMuxConfig())
 	default:
 		panic("unknown protocol")
 	}
@@ -80,10 +80,10 @@ func yaMuxConfig() *yamux.Config {
 
 func (p Protocol) String() string {
 	switch p {
-	case ProtocolYAMux:
-		return "yamux"
 	case ProtocolSMux:
 		return "smux"
+	case ProtocolYAMux:
+		return "yamux"
 	default:
 		return "unknown"
 	}
diff --git a/docs/configuration/shared/multiplex.md b/docs/configuration/shared/multiplex.md
index 73b6bdd0..b48b04c7 100644
--- a/docs/configuration/shared/multiplex.md
+++ b/docs/configuration/shared/multiplex.md
@@ -7,7 +7,7 @@
 ```json
 {
   "enabled": true,
-  "protocol": "yamux",
+  "protocol": "smux",
   "max_connections": 4,
   "min_streams": 4,
   "max_streams": 0
@@ -26,10 +26,10 @@ Multiplex protocol.
 
 | Protocol | Description                        |
 |----------|------------------------------------|
-| yamux    | https://github.com/hashicorp/yamux |
 | smux     | https://github.com/xtaci/smux      |
+| yamux    | https://github.com/hashicorp/yamux |
 
-YAMux is used by default.
+SMux is used by default.
 
 #### max_connections
 
diff --git a/outbound/shadowsocks.go b/outbound/shadowsocks.go
index 3fa4fd33..ba5f52e5 100644
--- a/outbound/shadowsocks.go
+++ b/outbound/shadowsocks.go
@@ -54,11 +54,33 @@ func NewShadowsocks(ctx context.Context, router adapter.Router, logger log.Conte
 }
 
 func (h *Shadowsocks) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	return h.multiplexDialer.DialContext(ctx, network, destination)
+	if h.multiplexDialer == nil {
+		switch N.NetworkName(network) {
+		case N.NetworkTCP:
+			h.logger.InfoContext(ctx, "outbound connection to ", destination)
+		case N.NetworkUDP:
+			h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
+		}
+		return (*shadowsocksDialer)(h).DialContext(ctx, network, destination)
+	} else {
+		switch N.NetworkName(network) {
+		case N.NetworkTCP:
+			h.logger.InfoContext(ctx, "outbound multiplex connection to ", destination)
+		case N.NetworkUDP:
+			h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
+		}
+		return h.multiplexDialer.DialContext(ctx, network, destination)
+	}
 }
 
 func (h *Shadowsocks) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	return h.multiplexDialer.ListenPacket(ctx, destination)
+	if h.multiplexDialer == nil {
+		h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
+		return (*shadowsocksDialer)(h).ListenPacket(ctx, destination)
+	} else {
+		h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
+		return h.multiplexDialer.ListenPacket(ctx, destination)
+	}
 }
 
 func (h *Shadowsocks) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
@@ -83,14 +105,12 @@ func (h *shadowsocksDialer) DialContext(ctx context.Context, network string, des
 	metadata.Destination = destination
 	switch N.NetworkName(network) {
 	case N.NetworkTCP:
-		h.logger.InfoContext(ctx, "outbound connection to ", destination)
 		outConn, err := h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
 		if err != nil {
 			return nil, err
 		}
 		return h.method.DialEarlyConn(outConn, destination), nil
 	case N.NetworkUDP:
-		h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
 		outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
 		if err != nil {
 			return nil, err
@@ -105,7 +125,6 @@ func (h *shadowsocksDialer) ListenPacket(ctx context.Context, destination M.Sock
 	ctx, metadata := adapter.AppendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
-	h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
 	outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
 	if err != nil {
 		return nil, err
diff --git a/route/router_dns.go b/route/router_dns.go
index 8d8c8b44..63a35e77 100644
--- a/route/router_dns.go
+++ b/route/router_dns.go
@@ -38,9 +38,9 @@ func (r *Router) Lookup(ctx context.Context, domain string, strategy dns.DomainS
 	defer cancel()
 	addrs, err := r.dnsClient.Lookup(ctx, transport, domain, strategy)
 	if len(addrs) > 0 {
-		r.logger.InfoContext(ctx, "lookup succeed for ", domain, ": ", strings.Join(F.MapToString(addrs), " "))
+		r.dnsLogger.InfoContext(ctx, "lookup succeed for ", domain, ": ", strings.Join(F.MapToString(addrs), " "))
 	} else {
-		r.logger.ErrorContext(ctx, E.Cause(err, "lookup failed for ", domain))
+		r.dnsLogger.ErrorContext(ctx, E.Cause(err, "lookup failed for ", domain))
 	}
 	return addrs, err
 }