diff --git a/README.md b/README.md
index 9c2e784..34d3727 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ glider -h
   -rules-dir string
     	rule file folder
   -service value
-    	enable services
+    	run specified services, format: SERVICE_NAME[,SERVICE_CONFIG]
   -strategy string
     	forward strategy, default: rr (default "rr")
   -verbose
@@ -373,9 +373,9 @@ glider -config CONFIGPATH -listen :8080 -verbose
 
 #### Scheme: 
 
-service=SERVICE_NAME[,SERVICE_CONFIG]
+```service=SERVICE_NAME[,SERVICE_CONFIG]```
 
-- dhcpd(from v0.11.0): 
+- dhcpd: 
   - service=dhcpd,INTERFACE,START_IP,END_IP
   - e.g., service=dhcpd,en0,192.168.254.100,192.168.254.199
 
diff --git a/config.go b/config.go
index 4b1440c..65ddd9a 100644
--- a/config.go
+++ b/config.go
@@ -63,7 +63,7 @@ func parseConfig() *Config {
 	flag.IntVar(&conf.DNSConfig.MinTTL, "dnsminttl", 0, "minimum TTL value for entries in the CACHE(seconds)")
 	flag.StringSliceUniqVar(&conf.DNSConfig.Records, "dnsrecord", nil, "custom dns record, format: domain/ip")
 
-	flag.StringSliceUniqVar(&conf.Services, "service", nil, "enable services")
+	flag.StringSliceUniqVar(&conf.Services, "service", nil, "run specified services, format: SERVICE_NAME[,SERVICE_CONFIG]")
 
 	flag.Usage = usage
 	err := flag.Parse()
diff --git a/common/conn/conn.go b/proxy/conn.go
similarity index 99%
rename from common/conn/conn.go
rename to proxy/conn.go
index 3ce6d4c..4e64a40 100644
--- a/common/conn/conn.go
+++ b/proxy/conn.go
@@ -1,4 +1,4 @@
-package conn
+package proxy
 
 import (
 	"bufio"
diff --git a/proxy/http/client.go b/proxy/http/client.go
index 3a653c7..da44e7e 100644
--- a/proxy/http/client.go
+++ b/proxy/http/client.go
@@ -6,7 +6,6 @@ import (
 	"net"
 	"net/textproto"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/common/pool"
 	"github.com/nadoo/glider/proxy"
@@ -51,7 +50,7 @@ func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
 		return nil, err
 	}
 
-	c := conn.NewConn(rc)
+	c := proxy.NewConn(rc)
 	tpr := textproto.NewReader(c.Reader())
 	line, err := tpr.ReadLine()
 	if err != nil {
diff --git a/proxy/http/server.go b/proxy/http/server.go
index e69a7a4..1c6abd6 100644
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -9,7 +9,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/common/pool"
 	"github.com/nadoo/glider/proxy"
@@ -46,15 +45,15 @@ func (s *HTTP) ListenAndServe() {
 func (s *HTTP) Serve(cc net.Conn) {
 	defer cc.Close()
 
-	var c *conn.Conn
+	var c *proxy.Conn
 	switch cc := cc.(type) {
-	case *conn.Conn:
+	case *proxy.Conn:
 		c = cc
 	case *net.TCPConn:
 		cc.SetKeepAlive(true)
-		c = conn.NewConn(cc)
+		c = proxy.NewConn(cc)
 	default:
-		c = conn.NewConn(cc)
+		c = proxy.NewConn(cc)
 	}
 
 	req, err := parseRequest(c.Reader())
@@ -72,7 +71,7 @@ func (s *HTTP) Serve(cc net.Conn) {
 	s.servRequest(req, c)
 }
 
-func (s *HTTP) servRequest(req *request, c *conn.Conn) {
+func (s *HTTP) servRequest(req *request, c *proxy.Conn) {
 	// Auth
 	if s.user != "" && s.password != "" {
 		if user, pass, ok := extractUserPass(req.auth); !ok || user != s.user || pass != s.password {
@@ -103,7 +102,7 @@ func (s *HTTP) servHTTPS(r *request, c net.Conn) {
 
 	log.F("[http] %s <-> %s [c] via %s", c.RemoteAddr(), r.uri, dialer.Addr())
 
-	if err = conn.Relay(c, rc); err != nil {
+	if err = proxy.Relay(c, rc); err != nil {
 		log.F("[http] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), r.uri, dialer.Addr(), err)
 		// record remote conn failure only
 		if !strings.Contains(err.Error(), s.addr) {
@@ -112,7 +111,7 @@ func (s *HTTP) servHTTPS(r *request, c net.Conn) {
 	}
 }
 
-func (s *HTTP) servHTTP(req *request, c *conn.Conn) {
+func (s *HTTP) servHTTP(req *request, c *proxy.Conn) {
 	rc, dialer, err := s.proxy.Dial("tcp", req.target)
 	if err != nil {
 		fmt.Fprintf(c, "%s 502 ERROR\r\n\r\n", req.proto)
@@ -134,7 +133,7 @@ func (s *HTTP) servHTTP(req *request, c *conn.Conn) {
 	// copy the left request bytes to remote server. eg. length specificed or chunked body.
 	go func() {
 		if _, err := c.Reader().Peek(1); err == nil {
-			conn.Copy(rc, c)
+			proxy.Copy(rc, c)
 			rc.SetDeadline(time.Now())
 			c.SetDeadline(time.Now())
 		}
@@ -168,5 +167,5 @@ func (s *HTTP) servHTTP(req *request, c *conn.Conn) {
 	log.F("[http] %s <-> %s via %s", c.RemoteAddr(), req.target, dialer.Addr())
 	c.Write(buf.Bytes())
 
-	conn.Copy(c, r)
+	proxy.Copy(c, r)
 }
diff --git a/proxy/mixed/mixed.go b/proxy/mixed/mixed.go
index 54f7a04..e53908c 100644
--- a/proxy/mixed/mixed.go
+++ b/proxy/mixed/mixed.go
@@ -5,7 +5,6 @@ import (
 	"net"
 	"net/url"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/proxy/http"
@@ -87,7 +86,7 @@ func (m *Mixed) Serve(c net.Conn) {
 		c.SetKeepAlive(true)
 	}
 
-	cc := conn.NewConn(c)
+	cc := proxy.NewConn(c)
 	head, err := cc.Peek(1)
 	if err != nil {
 		// log.F("[mixed] socks5 peek error: %s", err)
diff --git a/proxy/redir/redir_linux.go b/proxy/redir/redir_linux.go
index c91390c..92ccc21 100644
--- a/proxy/redir/redir_linux.go
+++ b/proxy/redir/redir_linux.go
@@ -11,7 +11,6 @@ import (
 	"syscall"
 	"unsafe"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/common/socks"
 	"github.com/nadoo/glider/proxy"
@@ -114,7 +113,7 @@ func (s *RedirProxy) Serve(c net.Conn) {
 
 	log.F("[redir] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
 
-	if err = conn.Relay(c, rc); err != nil {
+	if err = proxy.Relay(c, rc); err != nil {
 		log.F("[redir] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
 		// record remote conn failure only
 		if !strings.Contains(err.Error(), s.addr) {
diff --git a/proxy/socks5/socks5.go b/proxy/socks5/socks5.go
index 8442f27..2f14f5a 100644
--- a/proxy/socks5/socks5.go
+++ b/proxy/socks5/socks5.go
@@ -19,7 +19,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/common/pool"
 	"github.com/nadoo/glider/common/socks"
@@ -142,7 +141,7 @@ func (s *Socks5) Serve(c net.Conn) {
 
 	log.F("[socks5] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
 
-	if err = conn.Relay(c, rc); err != nil {
+	if err = proxy.Relay(c, rc); err != nil {
 		log.F("[socks5] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
 		// record remote conn failure only
 		if !strings.Contains(err.Error(), s.addr) {
@@ -163,7 +162,7 @@ func (s *Socks5) ListenAndServeUDP() {
 	log.F("[socks5-udp] listening UDP on %s", s.addr)
 
 	var nm sync.Map
-	buf := make([]byte, conn.UDPBufSize)
+	buf := make([]byte, proxy.UDPBufSize)
 
 	for {
 		c := NewPktConn(lc, nil, nil, true, nil)
@@ -192,7 +191,7 @@ func (s *Socks5) ListenAndServeUDP() {
 			nm.Store(raddr.String(), pc)
 
 			go func() {
-				conn.RelayUDP(c, raddr, pc, 2*time.Minute)
+				proxy.RelayUDP(c, raddr, pc, 2*time.Minute)
 				pc.Close()
 				nm.Delete(raddr.String())
 			}()
diff --git a/proxy/ss/ss.go b/proxy/ss/ss.go
index 8baded1..de45b1e 100644
--- a/proxy/ss/ss.go
+++ b/proxy/ss/ss.go
@@ -10,7 +10,6 @@ import (
 
 	"github.com/nadoo/go-shadowsocks2/core"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/common/pool"
 	"github.com/nadoo/glider/common/socks"
@@ -122,7 +121,7 @@ func (s *SS) Serve(c net.Conn) {
 		}
 		defer rc.Close()
 
-		buf := pool.GetBuffer(conn.UDPBufSize)
+		buf := pool.GetBuffer(proxy.UDPBufSize)
 		defer pool.PutBuffer(buf)
 
 		n, err := c.Read(buf)
@@ -160,7 +159,7 @@ func (s *SS) Serve(c net.Conn) {
 
 	log.F("[ss] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
 
-	if err = conn.Relay(c, rc); err != nil {
+	if err = proxy.Relay(c, rc); err != nil {
 		log.F("[ss] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
 		// record remote conn failure only
 		if !strings.Contains(err.Error(), s.addr) {
@@ -183,7 +182,7 @@ func (s *SS) ListenAndServeUDP() {
 	log.F("[ss-udp] listening UDP on %s", s.addr)
 
 	var nm sync.Map
-	buf := make([]byte, conn.UDPBufSize)
+	buf := make([]byte, proxy.UDPBufSize)
 
 	for {
 		c := NewPktConn(lc, nil, nil, true)
@@ -207,7 +206,7 @@ func (s *SS) ListenAndServeUDP() {
 			nm.Store(raddr.String(), pc)
 
 			go func() {
-				conn.RelayUDP(c, raddr, pc, 2*time.Minute)
+				proxy.RelayUDP(c, raddr, pc, 2*time.Minute)
 				pc.Close()
 				nm.Delete(raddr.String())
 			}()
diff --git a/proxy/tcptun/tcptun.go b/proxy/tcptun/tcptun.go
index e76e85b..2db3927 100644
--- a/proxy/tcptun/tcptun.go
+++ b/proxy/tcptun/tcptun.go
@@ -6,7 +6,6 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/proxy"
 )
@@ -90,7 +89,7 @@ func (s *TCPTun) Serve(c net.Conn) {
 
 	log.F("[tcptun] %s <-> %s via %s", c.RemoteAddr(), s.raddr, dialer.Addr())
 
-	if err = conn.Relay(c, rc); err != nil {
+	if err = proxy.Relay(c, rc); err != nil {
 		log.F("[tcptun] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), s.raddr, dialer.Addr(), err)
 		// record remote conn failure only
 		if !strings.Contains(err.Error(), s.addr) {
diff --git a/proxy/trojan/packet.go b/proxy/trojan/packet.go
index 8ad4050..09d284f 100644
--- a/proxy/trojan/packet.go
+++ b/proxy/trojan/packet.go
@@ -6,9 +6,9 @@ import (
 	"io"
 	"net"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/pool"
 	"github.com/nadoo/glider/common/socks"
+	"github.com/nadoo/glider/proxy"
 )
 
 // PktConn .
@@ -41,7 +41,7 @@ func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	}
 
 	length := int(binary.BigEndian.Uint16(b[:2]))
-	if length > conn.UDPBufSize {
+	if length > proxy.UDPBufSize {
 		return 0, nil, errors.New("packet invalid")
 	}
 
diff --git a/proxy/udptun/udptun.go b/proxy/udptun/udptun.go
index 9aef394..9b1c778 100644
--- a/proxy/udptun/udptun.go
+++ b/proxy/udptun/udptun.go
@@ -8,7 +8,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/proxy"
 )
@@ -66,7 +65,7 @@ func (s *UDPTun) ListenAndServe() {
 	log.F("[udptun] listening UDP on %s", s.addr)
 
 	var nm sync.Map
-	buf := make([]byte, conn.UDPBufSize)
+	buf := make([]byte, proxy.UDPBufSize)
 
 	for {
 		n, raddr, err := c.ReadFrom(buf)
@@ -88,7 +87,7 @@ func (s *UDPTun) ListenAndServe() {
 			nm.Store(raddr.String(), pc)
 
 			go func(c, pc net.PacketConn, raddr net.Addr) {
-				conn.RelayUDP(c, raddr, pc, 2*time.Minute)
+				proxy.RelayUDP(c, raddr, pc, 2*time.Minute)
 				pc.Close()
 				nm.Delete(raddr.String())
 			}(c, pc, raddr)
diff --git a/proxy/uottun/uottun.go b/proxy/uottun/uottun.go
index 97cdb54..4f3699c 100644
--- a/proxy/uottun/uottun.go
+++ b/proxy/uottun/uottun.go
@@ -8,7 +8,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/log"
 	"github.com/nadoo/glider/proxy"
 )
@@ -64,7 +63,7 @@ func (s *UoTTun) ListenAndServe() {
 
 	log.F("[uottun] listening UDP on %s", s.addr)
 
-	buf := make([]byte, conn.UDPBufSize)
+	buf := make([]byte, proxy.UDPBufSize)
 
 	for {
 		n, clientAddr, err := c.ReadFrom(buf)
@@ -82,7 +81,7 @@ func (s *UoTTun) ListenAndServe() {
 		go func() {
 			// no remote forwarder, just a local udp forwarder
 			if urc, ok := rc.(*net.UDPConn); ok {
-				conn.RelayUDP(c, clientAddr, urc, 2*time.Minute)
+				proxy.RelayUDP(c, clientAddr, urc, 2*time.Minute)
 				urc.Close()
 				return
 			}
diff --git a/proxy/vless/client.go b/proxy/vless/client.go
index 7e5760b..4fe1fc4 100644
--- a/proxy/vless/client.go
+++ b/proxy/vless/client.go
@@ -9,8 +9,8 @@ import (
 	"net"
 	"strings"
 
-	"github.com/nadoo/glider/common/conn"
 	"github.com/nadoo/glider/common/pool"
+	"github.com/nadoo/glider/proxy"
 )
 
 const Version byte = 0
@@ -69,7 +69,7 @@ func (c *Conn) Read(b []byte) (n int, err error) {
 		}
 
 		if addLen := int64(buf[1]); addLen > 0 {
-			conn.CopyN(ioutil.Discard, c.Conn, addLen)
+			proxy.CopyN(ioutil.Discard, c.Conn, addLen)
 		}
 		c.rcved = true
 	}