UPDATE 2.2

src/org/kne/cloud/network/nathole/ICMPNatholeTest.java

@@ -0,0 +1,27 @@
+package org.kne.cloud.network.nathole;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.util.Arrays;
+
+public class ICMPNatholeTest {
+	public static void main(String[] args) throws IllegalStateException, IOException {
+		
+	}
+	 public static String toString(byte[] a) {
+	        if (a == null)
+	            return "null";
+	        int iMax = a.length - 1;
+	        if (iMax == -1)
+	            return "[]";
+
+	        StringBuilder b = new StringBuilder();
+	        b.append('[');
+	        for (int i = 0; ; i++) {
+	            b.append( Integer.toString(a[i]&0xff,16));
+	            if (i == iMax)
+	                return b.append(']').toString();
+	            b.append(", ");
+	        }
+	    }
+}

src/org/kne/cloud/network/nathole/UDPNatholeTest.java

@@ -0,0 +1,42 @@
+package org.kne.cloud.network.nathole;
+
+import java.io.IOException;
+import java.net.BindException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.MulticastSocket;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.net.SocketOption;
+import java.net.SocketOptions;
+import java.nio.channels.SocketChannel;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class UDPNatholeTest {
+	public static ExecutorService exc=Executors.newCachedThreadPool();
+	public static void main(String[] args) throws IOException {
+		InetAddress addr=InetAddress.getByName("10.235.16.1");
+		for (int i1 = 1024; i1 < 65536; i1++) {
+		MulticastSocket ms=new MulticastSocket(i1);
+		//ms.setReuseAddress(true);
+		ms.setSendBufferSize(65536);
+		DatagramPacket fp=new DatagramPacket(new byte[1], 1, addr, 13000);
+		ms.send(fp);
+		new Thread(()->{
+			DatagramPacket rp=new DatagramPacket(new byte[10], 10);
+			try {
+				ms.receive(rp);
+				System.err.println(rp.getAddress());
+				System.err.println(rp.getLength());
+				System.exit(0);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}).start();
+		System.out.println(i1);
+		}
+	}
+}