diff --git a/pom.xml b/pom.xml
index 7ade7c5..412fe36 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
 	<groupId>com.github.immueggpain</groupId>
 	<artifactId>bettermultiplayer</artifactId>
-	<version>0.3.8</version>
+	<version>0.3.9</version>
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
diff --git a/src/main/java/com/github/immueggpain/bettermultiplayer/BMPPeer.java b/src/main/java/com/github/immueggpain/bettermultiplayer/BMPPeer.java
index f6ea629..0bf0a46 100644
--- a/src/main/java/com/github/immueggpain/bettermultiplayer/BMPPeer.java
+++ b/src/main/java/com/github/immueggpain/bettermultiplayer/BMPPeer.java
@@ -68,8 +68,9 @@ public Void call() throws Exception {
 		// start ovpn
 		startOvpnProcess(Launcher.LOCAL_PORT);
 
-		recvOvpnThread.join();
-		recvServerThread.join();
+		// no need to join, if ovpn process exits, we exit too.
+		// recvOvpnThread.join();
+		// recvServerThread.join();
 
 		return null;
 	}
diff --git a/src/main/java/com/github/immueggpain/bettermultiplayer/BMPUDPHub.java b/src/main/java/com/github/immueggpain/bettermultiplayer/BMPUDPHub.java
index 4c50435..2cca759 100644
--- a/src/main/java/com/github/immueggpain/bettermultiplayer/BMPUDPHub.java
+++ b/src/main/java/com/github/immueggpain/bettermultiplayer/BMPUDPHub.java
@@ -54,6 +54,7 @@ private void recv_thread(int listen_port) {
 				p.setData(recvBuf);
 				socket.receive(p);
 				InetSocketAddress saddr = (InetSocketAddress) p.getSocketAddress();
+				System.out.println("recv from " + saddr);
 				updatePlayerInfo(saddr, System.currentTimeMillis());
 				broadcastPacket(saddr, p);
 			}
@@ -101,6 +102,7 @@ private void broadcastPacket(InetSocketAddress source, DatagramPacket p) {
 				p.setSocketAddress(dest);
 				try {
 					socket.send(p);
+					System.out.println("send to " + dest);
 				} catch (IOException e) {
 					e.printStackTrace();
 				}
diff --git a/src/main/java/com/github/immueggpain/bettermultiplayer/Launcher.java b/src/main/java/com/github/immueggpain/bettermultiplayer/Launcher.java
index be4881b..34facb0 100644
--- a/src/main/java/com/github/immueggpain/bettermultiplayer/Launcher.java
+++ b/src/main/java/com/github/immueggpain/bettermultiplayer/Launcher.java
@@ -10,7 +10,7 @@
 		version = Launcher.VERSTR, subcommands = { HelpCommand.class, BMPUDPHub.class, BMPPeer.class })
 public class Launcher implements Callable<Void> {
 
-	public static final String VERSTR = "0.3.8";
+	public static final String VERSTR = "0.3.9";
 	public static final int LOCAL_PORT = 2233;
 	public static final int LOCAL_OVPN_PORT = 1194;