diff --git a/infra/conf/cfgcommon/muxcfg/mux.go b/infra/conf/cfgcommon/muxcfg/mux.go
new file mode 100644
index 000000000..ccd3bd776
--- /dev/null
+++ b/infra/conf/cfgcommon/muxcfg/mux.go
@@ -0,0 +1,25 @@
+package muxcfg
+
+import "github.com/v2fly/v2ray-core/v4/app/proxyman"
+
+type MuxConfig struct {
+	Enabled     bool  `json:"enabled"`
+	Concurrency int16 `json:"concurrency"`
+}
+
+// Build creates MultiplexingConfig, Concurrency < 0 completely disables mux.
+func (m *MuxConfig) Build() *proxyman.MultiplexingConfig {
+	if m.Concurrency < 0 {
+		return nil
+	}
+
+	var con uint32 = 8
+	if m.Concurrency > 0 {
+		con = uint32(m.Concurrency)
+	}
+
+	return &proxyman.MultiplexingConfig{
+		Enabled:     m.Enabled,
+		Concurrency: con,
+	}
+}
diff --git a/infra/conf/cfgcommon/proxycfg/proxy.go b/infra/conf/cfgcommon/proxycfg/proxy.go
new file mode 100644
index 000000000..239fe10ac
--- /dev/null
+++ b/infra/conf/cfgcommon/proxycfg/proxy.go
@@ -0,0 +1,21 @@
+package proxycfg
+
+import "github.com/v2fly/v2ray-core/v4/transport/internet"
+
+type ProxyConfig struct {
+	Tag                 string `json:"tag"`
+	TransportLayerProxy bool   `json:"transportLayer"`
+}
+
+//go:generate go run github.com/v2fly/v2ray-core/v4/common/errors/errorgen
+
+// Build implements Buildable.
+func (v *ProxyConfig) Build() (*internet.ProxyConfig, error) {
+	if v.Tag == "" {
+		return nil, newError("Proxy tag is not set.")
+	}
+	return &internet.ProxyConfig{
+		Tag:                 v.Tag,
+		TransportLayerProxy: v.TransportLayerProxy,
+	}, nil
+}
diff --git a/infra/conf/v4/transport_internet.go b/infra/conf/v4/transport_internet.go
index e45907332..b79fcbe53 100644
--- a/infra/conf/v4/transport_internet.go
+++ b/infra/conf/v4/transport_internet.go
@@ -406,19 +406,3 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 	}
 	return config, nil
 }
-
-type ProxyConfig struct {
-	Tag                 string `json:"tag"`
-	TransportLayerProxy bool   `json:"transportLayer"`
-}
-
-// Build implements Buildable.
-func (v *ProxyConfig) Build() (*internet.ProxyConfig, error) {
-	if v.Tag == "" {
-		return nil, newError("Proxy tag is not set.")
-	}
-	return &internet.ProxyConfig{
-		Tag:                 v.Tag,
-		TransportLayerProxy: v.TransportLayerProxy,
-	}, nil
-}
diff --git a/infra/conf/v4/v2ray.go b/infra/conf/v4/v2ray.go
index 306de1525..c41832ade 100644
--- a/infra/conf/v4/v2ray.go
+++ b/infra/conf/v4/v2ray.go
@@ -3,6 +3,8 @@ package v4
 import (
 	"encoding/json"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/cfgcommon/loader"
+	"github.com/v2fly/v2ray-core/v4/infra/conf/cfgcommon/muxcfg"
+	"github.com/v2fly/v2ray-core/v4/infra/conf/cfgcommon/proxycfg"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/cfgcommon/sniffer"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/synthetic/dns"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/synthetic/log"
@@ -58,28 +60,6 @@ func toProtocolList(s []string) ([]proxyman.KnownProtocols, error) {
 	return kp, nil
 }
 
-type MuxConfig struct {
-	Enabled     bool  `json:"enabled"`
-	Concurrency int16 `json:"concurrency"`
-}
-
-// Build creates MultiplexingConfig, Concurrency < 0 completely disables mux.
-func (m *MuxConfig) Build() *proxyman.MultiplexingConfig {
-	if m.Concurrency < 0 {
-		return nil
-	}
-
-	var con uint32 = 8
-	if m.Concurrency > 0 {
-		con = uint32(m.Concurrency)
-	}
-
-	return &proxyman.MultiplexingConfig{
-		Enabled:     m.Enabled,
-		Concurrency: con,
-	}
-}
-
 type InboundDetourAllocationConfig struct {
 	Strategy    string  `json:"strategy"`
 	Concurrency *uint32 `json:"concurrency"`
@@ -221,13 +201,13 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 }
 
 type OutboundDetourConfig struct {
-	Protocol      string             `json:"protocol"`
-	SendThrough   *cfgcommon.Address `json:"sendThrough"`
-	Tag           string             `json:"tag"`
-	Settings      *json.RawMessage   `json:"settings"`
-	StreamSetting *StreamConfig      `json:"streamSettings"`
-	ProxySettings *ProxyConfig       `json:"proxySettings"`
-	MuxSettings   *MuxConfig         `json:"mux"`
+	Protocol      string                `json:"protocol"`
+	SendThrough   *cfgcommon.Address    `json:"sendThrough"`
+	Tag           string                `json:"tag"`
+	Settings      *json.RawMessage      `json:"settings"`
+	StreamSetting *StreamConfig         `json:"streamSettings"`
+	ProxySettings *proxycfg.ProxyConfig `json:"proxySettings"`
+	MuxSettings   *muxcfg.MuxConfig     `json:"mux"`
 }
 
 // Build implements Buildable.