diff --git a/app/router/rules/json/fieldrule.go b/app/router/rules/json/fieldrule.go
index 2369f6a3..dfcf108f 100644
--- a/app/router/rules/json/fieldrule.go
+++ b/app/router/rules/json/fieldrule.go
@@ -8,7 +8,6 @@ import (
 	"strings"
 
 	v2net "github.com/v2ray/v2ray-core/common/net"
-	v2netjson "github.com/v2ray/v2ray-core/common/net/json"
 )
 
 type StringList []string
@@ -83,7 +82,7 @@ type FieldRule struct {
 	Domain  []DomainMatcher
 	IP      []*net.IPNet
 	Port    *v2net.PortRange
-	Network v2net.NetworkList
+	Network *v2net.NetworkList
 }
 
 func (this *FieldRule) Apply(dest v2net.Destination) bool {
@@ -139,10 +138,10 @@ func (this *FieldRule) Apply(dest v2net.Destination) bool {
 func (this *FieldRule) UnmarshalJSON(data []byte) error {
 	type RawFieldRule struct {
 		Rule
-		Domain  *StringList            `json:"domain"`
-		IP      *StringList            `json:"ip"`
-		Port    *v2net.PortRange       `json:"port"`
-		Network *v2netjson.NetworkList `json:"network"`
+		Domain  *StringList        `json:"domain"`
+		IP      *StringList        `json:"ip"`
+		Port    *v2net.PortRange   `json:"port"`
+		Network *v2net.NetworkList `json:"network"`
 	}
 	rawFieldRule := RawFieldRule{}
 	err := json.Unmarshal(data, &rawFieldRule)
diff --git a/common/net/json/network.go b/common/net/json/network.go
deleted file mode 100644
index de990f1a..00000000
--- a/common/net/json/network.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package json
-
-import (
-	"strings"
-
-	v2net "github.com/v2ray/v2ray-core/common/net"
-	serialjson "github.com/v2ray/v2ray-core/common/serial/json"
-)
-
-type NetworkList []string
-
-func NewNetworkList(networks []string) NetworkList {
-	list := NetworkList(make([]string, len(networks)))
-	for idx, network := range networks {
-		list[idx] = strings.ToLower(strings.TrimSpace(network))
-	}
-	return list
-}
-
-func (this *NetworkList) UnmarshalJSON(data []byte) error {
-	strlist, err := serialjson.UnmarshalStringList(data)
-	if err != nil {
-		return err
-	}
-	*this = NewNetworkList(strlist)
-	return nil
-}
-
-func (this *NetworkList) HasNetwork(network v2net.Network) bool {
-	for _, value := range *this {
-		if value == string(network) {
-			return true
-		}
-	}
-	return false
-}
diff --git a/common/net/network.go b/common/net/network.go
index bfc57e6d..b5fb610d 100644
--- a/common/net/network.go
+++ b/common/net/network.go
@@ -1,5 +1,9 @@
 package net
 
+import (
+	"strings"
+)
+
 const (
 	TCPNetwork = Network("tcp")
 	UDPNetwork = Network("udp")
@@ -7,6 +11,21 @@ const (
 
 type Network string
 
-type NetworkList interface {
-	HasNetwork(Network) bool
+type NetworkList []Network
+
+func NewNetworkList(networks []string) NetworkList {
+	list := NetworkList(make([]Network, len(networks)))
+	for idx, network := range networks {
+		list[idx] = Network(strings.ToLower(strings.TrimSpace(network)))
+	}
+	return list
+}
+
+func (this *NetworkList) HasNetwork(network Network) bool {
+	for _, value := range *this {
+		if string(value) == string(network) {
+			return true
+		}
+	}
+	return false
 }
diff --git a/common/net/network_json.go b/common/net/network_json.go
new file mode 100644
index 00000000..1d720a16
--- /dev/null
+++ b/common/net/network_json.go
@@ -0,0 +1,16 @@
+// +build json
+
+package net
+
+import (
+	serialjson "github.com/v2ray/v2ray-core/common/serial/json"
+)
+
+func (this *NetworkList) UnmarshalJSON(data []byte) error {
+	strlist, err := serialjson.UnmarshalStringList(data)
+	if err != nil {
+		return err
+	}
+	*this = NewNetworkList(strlist)
+	return nil
+}
diff --git a/common/net/json/network_test.go b/common/net/network_json_test.go
similarity index 61%
rename from common/net/json/network_test.go
rename to common/net/network_json_test.go
index cf7064c9..b0d0f81d 100644
--- a/common/net/json/network_test.go
+++ b/common/net/network_json_test.go
@@ -1,9 +1,12 @@
-package json
+// +build json
+
+package net_test
 
 import (
 	"encoding/json"
 	"testing"
 
+	. "github.com/v2ray/v2ray-core/common/net"
 	v2testing "github.com/v2ray/v2ray-core/testing"
 	"github.com/v2ray/v2ray-core/testing/assert"
 )
@@ -14,8 +17,8 @@ func TestArrayNetworkList(t *testing.T) {
 	var list NetworkList
 	err := json.Unmarshal([]byte("[\"Tcp\"]"), &list)
 	assert.Error(err).IsNil()
-	assert.Bool(list.HasNetwork("tcp")).IsTrue()
-	assert.Bool(list.HasNetwork("udp")).IsFalse()
+	assert.Bool(list.HasNetwork(Network("tcp"))).IsTrue()
+	assert.Bool(list.HasNetwork(Network("udp"))).IsFalse()
 }
 
 func TestStringNetworkList(t *testing.T) {
@@ -24,6 +27,6 @@ func TestStringNetworkList(t *testing.T) {
 	var list NetworkList
 	err := json.Unmarshal([]byte("\"TCP, ip\""), &list)
 	assert.Error(err).IsNil()
-	assert.Bool(list.HasNetwork("tcp")).IsTrue()
-	assert.Bool(list.HasNetwork("udp")).IsFalse()
+	assert.Bool(list.HasNetwork(Network("tcp"))).IsTrue()
+	assert.Bool(list.HasNetwork(Network("udp"))).IsFalse()
 }
diff --git a/proxy/dokodemo/config.go b/proxy/dokodemo/config.go
index 4416d71b..44d02e28 100644
--- a/proxy/dokodemo/config.go
+++ b/proxy/dokodemo/config.go
@@ -7,6 +7,6 @@ import (
 type Config struct {
 	Address v2net.Address
 	Port    v2net.Port
-	Network v2net.NetworkList
+	Network *v2net.NetworkList
 	Timeout int
 }
diff --git a/proxy/dokodemo/config_json.go b/proxy/dokodemo/config_json.go
index d5f6ada4..4e170db1 100644
--- a/proxy/dokodemo/config_json.go
+++ b/proxy/dokodemo/config_json.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 
 	v2net "github.com/v2ray/v2ray-core/common/net"
-	v2netjson "github.com/v2ray/v2ray-core/common/net/json"
 	"github.com/v2ray/v2ray-core/proxy/internal/config"
 )
 
@@ -14,10 +13,10 @@ func init() {
 	config.RegisterInboundConnectionConfig("dokodemo-door",
 		func(data []byte) (interface{}, error) {
 			type DokodemoConfig struct {
-				Host         *v2net.AddressJson     `json:"address"`
-				PortValue    v2net.Port             `json:"port"`
-				NetworkList  *v2netjson.NetworkList `json:"network"`
-				TimeoutValue int                    `json:"timeout"`
+				Host         *v2net.AddressJson `json:"address"`
+				PortValue    v2net.Port         `json:"port"`
+				NetworkList  *v2net.NetworkList `json:"network"`
+				TimeoutValue int                `json:"timeout"`
 			}
 			rawConfig := new(DokodemoConfig)
 			if err := json.Unmarshal(data, rawConfig); err != nil {