diff --git a/gold/link/send.go b/gold/link/send.go
index 3b3030b..16596e5 100644
--- a/gold/link/send.go
+++ b/gold/link/send.go
@@ -96,7 +96,7 @@ func (l *Link) write(p *head.Packet, teatype uint8, additional uint16, datasz ui
 	}
 	if l.doublepacket {
 		cpp := p.Copy()
-		_ = time.AfterFunc(time.Millisecond*(100+time.Duration(rand.Intn(50))), func() {
+		_ = time.AfterFunc(time.Millisecond*(10+time.Duration(rand.Intn(40))), func() {
 			defer cpp.Put()
 			_, _ = l.writeonce(cpp, teatype, additional, datasz, offset, istransfer, hasmore)
 		})
diff --git a/gold/p2p/udplite/lite.go b/gold/p2p/udplite/lite.go
index b9daa29..f0ab9d5 100644
--- a/gold/p2p/udplite/lite.go
+++ b/gold/p2p/udplite/lite.go
@@ -75,11 +75,11 @@ func listenUDPLite(network string, laddr *net.UDPAddr) (*net.UDPConn, error) {
 	}
 	var errsys error
 	err = rc.Control(func(fd uintptr) {
-		errsys = syscall.SetsockoptInt(int(fd), SOL_UDPLITE, UDPLITE_SEND_CSCOV, head.PacketHeadLen)
+		errsys = syscall.SetsockoptInt(int(fd), SOL_UDPLITE, UDPLITE_SEND_CSCOV, head.PacketHeadLen+8) // for xor rand
 		if errsys != nil {
 			return
 		}
-		errsys = syscall.SetsockoptInt(int(fd), SOL_UDPLITE, UDPLITE_RECV_CSCOV, head.PacketHeadLen)
+		errsys = syscall.SetsockoptInt(int(fd), SOL_UDPLITE, UDPLITE_RECV_CSCOV, head.PacketHeadLen+8) // for xor rand
 	})
 	if err != nil {
 		_ = conn.Close()