diff --git a/app/vpndialer/config.pb.go b/app/vpndialer/config.pb.go
deleted file mode 100644
index f2cc5e9e..00000000
--- a/app/vpndialer/config.pb.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package vpndialer
-
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import math "math"
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
-
-type Config struct {
-	Address string `protobuf:"bytes,1,opt,name=address" json:"address,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{0} }
-
-func (m *Config) GetAddress() string {
-	if m != nil {
-		return m.Address
-	}
-	return ""
-}
-
-func init() {
-	proto.RegisterType((*Config)(nil), "v2ray.core.app.vpndialer.Config")
-}
-
-func init() { proto.RegisterFile("v2ray.com/core/app/vpndialer/config.proto", fileDescriptor0) }
-
-var fileDescriptor0 = []byte{
-	// 150 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xd2, 0x2c, 0x33, 0x2a, 0x4a,
-	0xac, 0xd4, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0x2f, 0x4a, 0xd5, 0x4f, 0x2c, 0x28, 0xd0, 0x2f,
-	0x2b, 0xc8, 0x4b, 0xc9, 0x4c, 0xcc, 0x49, 0x2d, 0xd2, 0x4f, 0xce, 0xcf, 0x4b, 0xcb, 0x4c, 0xd7,
-	0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x92, 0x80, 0x29, 0x2d, 0x4a, 0xd5, 0x4b, 0x2c, 0x28, 0xd0,
-	0x83, 0x2b, 0x53, 0x52, 0xe2, 0x62, 0x73, 0x06, 0xab, 0x14, 0x92, 0xe0, 0x62, 0x4f, 0x4c, 0x49,
-	0x29, 0x4a, 0x2d, 0x2e, 0x96, 0x60, 0x54, 0x60, 0xd4, 0xe0, 0x0c, 0x82, 0x71, 0x9d, 0xdc, 0xb8,
-	0x64, 0x92, 0xf3, 0x73, 0xf5, 0x70, 0x99, 0x11, 0xc0, 0x18, 0xc5, 0x09, 0xe7, 0xac, 0x62, 0x92,
-	0x08, 0x33, 0x0a, 0x4a, 0xac, 0xd4, 0x73, 0x06, 0xa9, 0x73, 0x2c, 0x28, 0xd0, 0x0b, 0x2b, 0xc8,
-	0x73, 0x01, 0x4b, 0x25, 0xb1, 0x81, 0x1d, 0x63, 0x0c, 0x08, 0x00, 0x00, 0xff, 0xff, 0x97, 0xfc,
-	0x09, 0x70, 0xb9, 0x00, 0x00, 0x00,
-}
diff --git a/app/vpndialer/config.proto b/app/vpndialer/config.proto
deleted file mode 100644
index b5b801fb..00000000
--- a/app/vpndialer/config.proto
+++ /dev/null
@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-package v2ray.core.app.vpndialer;
-option csharp_namespace = "V2Ray.Core.App.VpnDialer";
-option go_package = "vpndialer";
-option java_package = "com.v2ray.core.app.vpndialer";
-option java_multiple_files = true;
-
-message Config {
-  string address = 1;
-}
diff --git a/app/vpndialer/unix/errors.generated.go b/app/vpndialer/unix/errors.generated.go
deleted file mode 100644
index d5873901..00000000
--- a/app/vpndialer/unix/errors.generated.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package unix
-
-import "v2ray.com/core/common/errors"
-
-func newError(values ...interface{}) *errors.Error {
-	return errors.New(values...).Path("App", "VPNDialer", "Unix")
-}
diff --git a/app/vpndialer/unix/unix.go b/app/vpndialer/unix/unix.go
deleted file mode 100644
index 47e9906f..00000000
--- a/app/vpndialer/unix/unix.go
+++ /dev/null
@@ -1,217 +0,0 @@
-package unix
-
-import (
-	"context"
-	"os"
-	"sync"
-
-	"golang.org/x/sys/unix"
-	"v2ray.com/core/app/vpndialer"
-	"v2ray.com/core/common"
-	"v2ray.com/core/common/net"
-	"v2ray.com/core/common/serial"
-	"v2ray.com/core/transport/internet"
-)
-
-//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg unix -path App,VPNDialer,Unix
-
-type status int
-
-const (
-	statusNew status = iota
-	statusOK
-	statusFail
-)
-
-type fdStatus struct {
-	status   status
-	fd       int
-	callback chan<- error
-}
-
-type protector struct {
-	sync.Mutex
-	address string
-	conn    *net.UnixConn
-	status  chan fdStatus
-}
-
-func readFrom(conn *net.UnixConn, schan chan<- fdStatus) {
-	var payload [6]byte
-	for {
-		_, err := conn.Read(payload[:])
-		if err != nil {
-			break
-		}
-		fd := serial.BytesToInt(payload[1:5])
-		s := status(payload[5])
-		schan <- fdStatus{
-			fd:     fd,
-			status: s,
-		}
-	}
-}
-
-func (m *protector) dial() (*net.UnixConn, error) {
-	m.Lock()
-	defer m.Unlock()
-
-	if m.conn != nil {
-		return m.conn, nil
-	}
-
-	conn, err := net.DialUnix("unix", nil, &net.UnixAddr{
-		Name: m.address,
-		Net:  "unix",
-	})
-	if err != nil {
-		return nil, err
-	}
-	m.conn = conn
-	m.status = make(chan fdStatus, 32)
-	go readFrom(conn, m.status)
-	go m.monitor(conn)
-	return conn, nil
-}
-
-func (m *protector) close() {
-	m.Lock()
-	defer m.Unlock()
-	if m.conn == nil {
-		return
-	}
-	m.conn.Close()
-	m.conn = nil
-}
-
-func (m *protector) monitor(c *net.UnixConn) {
-	pendingFd := make(map[int]chan<- error, 32)
-	for s := range m.status {
-		switch s.status {
-		case statusNew:
-			pendingFd[s.fd] = s.callback
-		case statusOK:
-			if c, f := pendingFd[s.fd]; f {
-				close(c)
-				delete(pendingFd, s.fd)
-			}
-		case statusFail:
-			if c, f := pendingFd[s.fd]; f {
-				c <- newError("failed to protect fd")
-				close(c)
-				delete(pendingFd, s.fd)
-			}
-		}
-	}
-}
-
-func (m *protector) protect(fd int) error {
-	conn, err := m.dial()
-	if err != nil {
-		return err
-	}
-
-	var payload [6]byte
-	serial.IntToBytes(fd, payload[1:1])
-	payload[5] = byte(statusNew)
-	if _, err := conn.Write(payload[:]); err != nil {
-		return err
-	}
-
-	wait := make(chan error)
-	m.status <- fdStatus{
-		status:   statusNew,
-		fd:       fd,
-		callback: wait,
-	}
-	return <-wait
-}
-
-type App struct {
-	protector *protector
-	dialer    *Dialer
-}
-
-func NewApp(ctx context.Context, config *vpndialer.Config) (*App, error) {
-	a := &App{
-		dialer: &Dialer{},
-		protector: &protector{
-			address: config.Address,
-		},
-	}
-	a.dialer.protect = a.protector.protect
-	return a, nil
-}
-
-func (*App) Interface() interface{} {
-	return (*App)(nil)
-}
-
-func (a *App) Start() error {
-	internet.UseAlternativeSystemDialer(a.dialer)
-	return nil
-}
-
-func (a *App) Close() {
-	internet.UseAlternativeSystemDialer(nil)
-}
-
-type Dialer struct {
-	protect func(fd int) error
-}
-
-func socket(dest net.Destination) (int, error) {
-	switch dest.Network {
-	case net.Network_TCP:
-		return unix.Socket(unix.AF_INET6, unix.SOCK_STREAM, unix.IPPROTO_TCP)
-	case net.Network_UDP:
-		return unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, unix.IPPROTO_UDP)
-	default:
-		return 0, newError("unknown network ", dest.Network)
-	}
-}
-
-func getIP(addr net.Address) (net.IP, error) {
-	if addr.Family().Either(net.AddressFamilyIPv4, net.AddressFamilyIPv6) {
-		return addr.IP(), nil
-	}
-	ips, err := net.LookupIP(addr.Domain())
-	if err != nil {
-		return nil, err
-	}
-	return ips[0], nil
-}
-
-func (d *Dialer) Dial(ctx context.Context, source net.Address, dest net.Destination) (net.Conn, error) {
-	fd, err := socket(dest)
-	if err != nil {
-		return nil, err
-	}
-	if err := d.protect(fd); err != nil {
-		return nil, err
-	}
-
-	ip, err := getIP(dest.Address)
-	if err != nil {
-		return nil, err
-	}
-
-	addr := &unix.SockaddrInet6{
-		Port:   int(dest.Port),
-		ZoneId: 0,
-	}
-	copy(addr.Addr[:], ip.To16())
-
-	if err := unix.Connect(fd, addr); err != nil {
-		return nil, err
-	}
-
-	file := os.NewFile(uintptr(fd), "Socket")
-	return net.FileConn(file)
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*vpndialer.Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
-		return NewApp(ctx, config.(*vpndialer.Config))
-	}))
-}
diff --git a/app/vpndialer/vpndialer.go b/app/vpndialer/vpndialer.go
deleted file mode 100644
index a4a3ea92..00000000
--- a/app/vpndialer/vpndialer.go
+++ /dev/null
@@ -1 +0,0 @@
-package vpndialer