ClientIPAddress = IncomingPacket.getAddress();
ClientPort = IncomingPacket.getPort();
OutToClientSocket = new DatagramSocket();
DatagramPacket PacketToClient = new DatagramPacket(sendBuffer, sendBuffer.length,     ClientIPAddress, ClientPort);
OutToClientSocket.send(PacketToClient);

ServerIP = InetAddress.getByName(MachineName);
DatagramPacket IncomingPacket = new DatagramPacket(buf, buf.length);
MySocket.receive(IncomingPacket);
buf = IncomingPacket.getData();
...