Fixed message header length in conn_linux

src/conn.go

@@ -45,15 +45,20 @@ func UpdateUDPListener(device *Device) error {
 	// close existing sockets
 
 	if netc.bind != nil {
+		println("close bind")
 		if err := netc.bind.Close(); err != nil {
 			return err
 		}
+		netc.bind = nil
+		println("closed")
 	}
 
 	// open new sockets
 
 	if device.tun.isUp.Get() {
 
+		println("creat")
+
 		// bind to new port
 
 		var err error
@@ -69,6 +74,8 @@ func UpdateUDPListener(device *Device) error {
 			return err
 		}
 
+		println("okay")
+
 		// clear cached source addresses
 
 		for _, peer := range device.peers {