diff --git a/gold/p2p/tcp/tcp.go b/gold/p2p/tcp/tcp.go
index 61118e4..883601a 100644
--- a/gold/p2p/tcp/tcp.go
+++ b/gold/p2p/tcp/tcp.go
@@ -3,9 +3,9 @@ package tcp
 import (
 	"errors"
 	"io"
-	"math/rand"
 	"net"
 	"reflect"
+	"runtime"
 	"strconv"
 	"time"
 
@@ -49,45 +49,22 @@ func (ep *EndPoint) Listen() (p2p.Conn, error) {
 	ep.addr = lstn.Addr().(*net.TCPAddr)
 	peerstimeout := ep.peerstimeout
 	if peerstimeout < time.Second {
-		peerstimeout = time.Second
+		peerstimeout = time.Second * 5
 	}
 	chansz := ep.recvchansize
 	if chansz < 32 {
 		chansz = 32
 	}
 	conn := &Conn{
-		addr: ep,
-		lstn: lstn,
-		peers: ttl.NewCacheOn(peerstimeout, [4]func(string, *net.TCPConn){
-			nil,
-			nil,
-			func(s string, t *net.TCPConn) {
-				err := t.Close()
-				if err != nil {
-					logrus.Debugln("[tcp] close conn from", ep, "to", s, "err:", err)
-				} else {
-					logrus.Debugln("[tcp] close conn from", ep, "to", s)
-				}
-			},
-			ep.keepAlive,
-		}),
-		recv: make(chan *connrecv, chansz),
+		addr:  ep,
+		lstn:  lstn,
+		peers: ttl.NewCache[string, *net.TCPConn](peerstimeout),
+		recv:  make(chan *connrecv, chansz),
 	}
 	go conn.accept()
 	return conn, nil
 }
 
-func (ep *EndPoint) keepAlive(_ string, t *net.TCPConn) {
-	_, err := io.Copy(t, &packet{
-		typ: packetTypeKeepAlive,
-		len: 1,
-		dat: []byte{byte(rand.Intn(256))},
-	})
-	if err != nil {
-		logrus.Debugln("[tcp] write keepalive from", ep, "to conn", t.RemoteAddr(), "err:", err)
-	}
-}
-
 type connrecv struct {
 	addr *EndPoint // cast from tcpconn.RemoteAddr()
 	pckt packet
@@ -210,7 +187,7 @@ func (conn *Conn) WriteToPeer(b []byte, ep p2p.EndPoint) (n int, err error) {
 		if dialtimeout < time.Second {
 			dialtimeout = time.Second
 		}
-		logrus.Infoln("[tcp] dial to", tcpep.addr, "timeout", dialtimeout)
+		logrus.Debugln("[tcp] dial to", tcpep.addr, "timeout", dialtimeout)
 		var cn net.Conn
 		// must use another port to send because there's no exsiting conn
 		cn, err = net.DialTimeout(tcpep.Network(), tcpep.addr.String(), dialtimeout)
@@ -221,8 +198,18 @@ func (conn *Conn) WriteToPeer(b []byte, ep p2p.EndPoint) (n int, err error) {
 		if !ok {
 			return 0, errors.New("expect *net.TCPConn but got " + reflect.ValueOf(cn).Type().String())
 		}
-		logrus.Infoln("[tcp] dial to", tcpep.addr, "success, local:", tcpconn.LocalAddr())
+		runtime.SetFinalizer(tcpconn, func(t *net.TCPConn) {
+			err := t.CloseWrite()
+			if err != nil {
+				logrus.Debugln("[tcp] close write from", t.LocalAddr(), "to", t.RemoteAddr(), "err:", err)
+			} else {
+				logrus.Debugln("[tcp] close write from", t.LocalAddr(), "to", t.RemoteAddr())
+			}
+		})
+		logrus.Debugln("[tcp] dial to", tcpep.addr, "success, local:", tcpconn.LocalAddr())
 		conn.peers.Set(tcpep.String(), tcpconn)
+	} else {
+		logrus.Debugln("[tcp] reuse tcpconn from", tcpconn.LocalAddr(), "to", tcpconn.RemoteAddr())
 	}
 	cnt, err := io.Copy(tcpconn, &packet{
 		typ: packetTypeNormal,