diff --git a/connector/relay/bind.go b/connector/relay/bind.go
index a8df615..42e6c93 100644
--- a/connector/relay/bind.go
+++ b/connector/relay/bind.go
@@ -6,7 +6,7 @@ import (
 	"net"
 	"strconv"
 
-	"github.com/go-gost/core/common/util/udp"
+	"github.com/go-gost/core/common/net/udp"
 	"github.com/go-gost/core/connector"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
@@ -67,11 +67,15 @@ func (c *relayConnector) bindUDP(ctx context.Context, conn net.Conn, network, ad
 
 	ln := udp.NewListener(
 		relay_util.UDPTunClientPacketConn(conn),
-		laddr,
-		opts.Backlog,
-		opts.UDPDataQueueSize, opts.UDPDataBufferSize,
-		opts.UDPConnTTL,
-		log)
+		&udp.ListenConfig{
+			Addr:           laddr,
+			Backlog:        opts.Backlog,
+			ReadQueueSize:  opts.UDPDataQueueSize,
+			ReadBufferSize: opts.UDPDataBufferSize,
+			TTL:            opts.UDPConnTTL,
+			KeepAlive:      true,
+			Logger:         log,
+		})
 
 	return ln, nil
 }
diff --git a/handler/dns/handler.go b/handler/dns/handler.go
index 8d2be54..d0ecd3b 100644
--- a/handler/dns/handler.go
+++ b/handler/dns/handler.go
@@ -114,7 +114,7 @@ func (h *dnsHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.
 		}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
 	}()
 
-	b := bufpool.Get(4096)
+	b := bufpool.Get(defaultBufferSize)
 	defer bufpool.Put(b)
 
 	n, err := conn.Read(*b)
@@ -165,7 +165,7 @@ func (h *dnsHandler) exchange(ctx context.Context, msg []byte, log logger.Logger
 
 	mr = h.lookupHosts(&mq, log)
 	if mr != nil {
-		b := bufpool.Get(4096)
+		b := bufpool.Get(defaultBufferSize)
 		return mr.PackBuffer(*b)
 	}
 
@@ -177,7 +177,7 @@ func (h *dnsHandler) exchange(ctx context.Context, msg []byte, log logger.Logger
 			log.Debugf("exchange message %d (cached): %s", mq.Id, mq.Question[0].String())
 			mr.Id = mq.Id
 
-			b := bufpool.Get(4096)
+			b := bufpool.Get(defaultBufferSize)
 			return mr.PackBuffer(*b)
 		}
 
@@ -188,7 +188,7 @@ func (h *dnsHandler) exchange(ctx context.Context, msg []byte, log logger.Logger
 		}()
 	}
 
-	b := bufpool.Get(4096)
+	b := bufpool.Get(defaultBufferSize)
 	defer bufpool.Put(b)
 
 	query, err := mq.PackBuffer(*b)
diff --git a/handler/dns/metadata.go b/handler/dns/metadata.go
index bd641db..e69b105 100644
--- a/handler/dns/metadata.go
+++ b/handler/dns/metadata.go
@@ -7,6 +7,10 @@ import (
 	mdata "github.com/go-gost/core/metadata"
 )
 
+const (
+	defaultBufferSize = 1024
+)
+
 type metadata struct {
 	readTimeout time.Duration
 	ttl         time.Duration
diff --git a/listener/ftcp/listener.go b/listener/ftcp/listener.go
index 45a0c63..eab7b4f 100644
--- a/listener/ftcp/listener.go
+++ b/listener/ftcp/listener.go
@@ -3,7 +3,7 @@ package ftcp
 import (
 	"net"
 
-	"github.com/go-gost/core/common/util/udp"
+	"github.com/go-gost/core/common/net/udp"
 	"github.com/go-gost/core/listener"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
@@ -39,11 +39,6 @@ func (l *ftcpListener) Init(md md.Metadata) (err error) {
 		return
 	}
 
-	laddr, err := net.ResolveTCPAddr("tcp", l.options.Addr)
-	if err != nil {
-		return
-	}
-
 	var conn net.PacketConn
 	conn, err = tcpraw.Listen("tcp", l.options.Addr)
 	if err != nil {
@@ -53,11 +48,14 @@ func (l *ftcpListener) Init(md md.Metadata) (err error) {
 
 	l.ln = udp.NewListener(
 		conn,
-		laddr,
-		l.md.backlog,
-		l.md.readQueueSize, l.md.readBufferSize,
-		l.md.ttl,
-		l.logger)
+		&udp.ListenConfig{
+			Backlog:        l.md.backlog,
+			ReadQueueSize:  l.md.readQueueSize,
+			ReadBufferSize: l.md.readBufferSize,
+			TTL:            l.md.ttl,
+			KeepAlive:      true,
+			Logger:         l.logger,
+		})
 	return
 }