add CtosMessage.ExternalAddress

Game/GameClient.cs

-using System.IO;
+using System;
+using System.IO;
 using System.Linq;
 using System.Net;
-using System.Text;
 using YGOSharp.Network;
 using YGOSharp.Network.Enums;
 using YGOSharp.Network.Utils;
@@ -65,7 +65,12 @@ namespace WindBot.Game
 
         private void OnConnected()
         {
-            BinaryWriter packet = GamePacketFactory.Create(CtosMessage.PlayerInfo);
+            BinaryWriter packet = GamePacketFactory.Create(CtosMessage.ExternalAddress);
+            packet.Write((UInt32)0); // real_ip, is always 0 in normal client
+            packet.WriteUnicodeAutoLength(_serverHost, 255);
+            Connection.Send(packet);
+
+            packet = GamePacketFactory.Create(CtosMessage.PlayerInfo);
             packet.WriteUnicode(Username, 20);
             Connection.Send(packet);
 

YGOSharp.Network/Enums/CtosMessage.cs

@@ -13,6 +13,7 @@
         Surrender = 0x14,
         TimeConfirm = 0x15,
         Chat = 0x16,
+        ExternalAddress = 0x17,
         HsToDuelist = 0x20,
         HsToObserver = 0x21,
         HsReady = 0x22,