报文长度修改为5k

src/main/java/com/virjar/echo/nat/client/EchoClient.java

@@ -134,7 +134,8 @@ public class EchoClient {
             natMessage.setType(PacketCommon.TYPE_TRANSFER);
             //write,但是不需要 flush
             natChannel.write(natMessage);
-            EchoLogger.getLogger().info("receive data from real server endpoint with big packet, forward to natChannel");
+            EchoLogger.getLogger().info("receive data from real server endpoint with big packet," +
+                    " forward to natChannel with segment packet");
         }
         if (msg.readableBytes() > 0) {
             EchoPacket natMessage = new EchoPacket();
@@ -145,6 +146,8 @@ public class EchoClient {
             natMessage.setType(PacketCommon.TYPE_TRANSFER);
 
             natChannel.writeAndFlush(natMessage);
+            EchoLogger.getLogger().info("receive data from real server endpoint with big packet," +
+                    " forward to natChannel for final packet");
         } else {
             natChannel.flush();
         }

src/main/java/com/virjar/echo/nat/protocol/PacketCommon.java

@@ -14,7 +14,7 @@ public class PacketCommon {
     static final long magic = 0x6563686F2E303031L;
 
     //单个报文，最大1M，超过1M需要分段
-    public static final int MAX_FRAME_LENGTH = 1024 * 1024;
+    public static final int MAX_FRAME_LENGTH = 5 * 1024;
 
     //心跳相关