diff --git a/common/defines.hpp b/common/defines.hpp
index 0eb6b94..321bd39 100644
--- a/common/defines.hpp
+++ b/common/defines.hpp
@@ -1,4 +1,8 @@
 #ifndef DEFINES_HPP_
 #define DEFINES_HPP
 
+#include <chrono>
+
+typedef std::chrono::high_resolution_clock Clock;
+
 #endif
diff --git a/common/packet_type.hpp b/common/packet_type.hpp
index 65e0693..54845bd 100644
--- a/common/packet_type.hpp
+++ b/common/packet_type.hpp
@@ -23,66 +23,65 @@ enum class PacketType {
 	PLAYER_NEW = 9,
 	PLAYER_DELETE = 10,
 	PLAYER_MOVE = 11,
-
 };
 
 struct Ping {
-	PacketType type = PacketType::PING;
+	PacketType type;
 };
 
 struct Pong {
-	PacketType type = PacketType::PONG;
+	PacketType type;
 };
 
 struct BroadcastRequest {
-	PacketType type = PacketType::BROADCAST_REQUEST;
+	PacketType type;
 };
 
 struct BroadcastResponse {
-	PacketType type = PacketType::BROADCAST_RESPONSE;
+	PacketType type;
 	char name[PACKET_STRING_SIZE];
 	//TODO: version
 };
 
 struct JoinRequest {
-	PacketType type = PacketType::JOIN_REQUEST;
+	PacketType type;
 	//TODO: player data
 };
 
 struct JoinResponse {
-	PacketType type = PacketType::JOIN_RESPONSE;
+	PacketType type;
 	int playerIndex;
 	//resource list
 };
 
 struct Disconnect {
-	PacketType type = PacketType::DISCONNECT;
+	PacketType type;
 };
 
 struct Synchronize {
-	PacketType type = PacketType::SYNCHRONIZE;
+	PacketType type;
 };
 
 struct PlayerNew {
-	PacketType type = PacketType::PLAYER_NEW;
+	PacketType type;
 	int playerIndex;
 	//TODO Playerdata
 };
 
 struct PlayerDelete {
-	PacketType type = PacketType::PLAYER_DELETE;
+	PacketType type;
 	int playerIndex;
 };
 
 struct PlayerMove {
-	PacketType type = PacketType::PLAYER_MOVE;
+	PacketType type;
 	int playerIndex;
 	Vector2 position;
 	Vector2 motion;
 };
 
 union Packet {
-	Packet() {}
+	Packet() {};
 	PacketType type = PacketType::NONE;
 
 	Ping ping;
diff --git a/rsc/config.cfg b/rsc/config.cfg
new file mode 100644
index 0000000..a7e8805
--- /dev/null
+++ b/rsc/config.cfg
@@ -0,0 +1 @@
+serverport=1991
\ No newline at end of file
diff --git a/server/makefile b/server/makefile
index 7738991..3df7ea7 100644
--- a/server/makefile
+++ b/server/makefile
@@ -1,6 +1,7 @@
 #config
 LIBDIR=../libs
-LIB=-lmingw32 -lSDLmain -lSDL $(LIBDIR)/out/libCodebase.a $(LIBDIR)/out/libSDL_net.a
+LOCALLIBS=$(LIBDIR)/out/libCodebase.a $(LIBDIR)/out/libSDL_net.a
+LIB=$(LOCALLIBS) -lwsock32 -liphlpapi -lmingw32 -lSDLmain -lSDL
 INCLUDES=$(LIBDIR)/Codebase $(LIBDIR)/SDL_net ../common
 CXXFLAGS+=-std=c++11 -DDEBUG $(addprefix -I,$(INCLUDES))
 
diff --git a/server/server_application.cpp b/server/server_application.cpp
index 242f5af..8901f16 100644
--- a/server/server_application.cpp
+++ b/server/server_application.cpp
@@ -1,5 +1,14 @@
 #include "server_application.hpp"
 
+#include <stdexcept>
+#include <iostream>
+
+using namespace std;
+
+//-------------------------
+//Public access members
+//-------------------------
+
 ServerApplication::ServerApplication() {
 	//
 }
@@ -9,13 +18,87 @@ ServerApplication::~ServerApplication() {
 }
 
 void ServerApplication::Init() {
-	//
+	if (SDLNet_Init()) {
+		throw(runtime_error("Failed to initialide SDL_net"));
+	}
+
+	configUtil.Load("rsc/config.cfg");
+	netUtil.Open(configUtil.Int("serverport"), sizeof(Packet));
+	running = true;
 }
 
 void ServerApplication::Proc() {
-	//
+	while(running) {
+		HandleNetwork();
+		UpdateWorld();
+		SDL_Delay(10);
+	}
 }
 
 void ServerApplication::Quit() {
-	//
+	netUtil.Close();
+	SDLNet_Quit();
 }
+
+//-------------------------
+//Game loop
+//-------------------------
+
+void ServerApplication::HandleNetwork() {
+	Packet p;
+	while(netUtil.Receive()) {
+		memcpy(&p, netUtil.GetInData(), sizeof(Packet));
+		switch(p.type) {
+			case PacketType::PING:
+				//
+			break;
+			case PacketType::PONG:
+				//
+			break;
+			case PacketType::BROADCAST_REQUEST:
+				//
+			break;
+			case PacketType::BROADCAST_RESPONSE:
+				//
+			break;
+			case PacketType::JOIN_REQUEST:
+				//
+			break;
+			case PacketType::JOIN_RESPONSE:
+				//
+			break;
+			case PacketType::DISCONNECT:
+				//
+			break;
+			case PacketType::SYNCHRONIZE:
+				//
+			break;
+			case PacketType::PLAYER_NEW:
+				//
+			break;
+			case PacketType::PLAYER_DELETE:
+				//
+			break;
+			case PacketType::PLAYER_MOVE:
+				//
+			break;
+			default:
+				throw(runtime_error("Failed to recognize the packet type"));
+		}
+	}
+}
+
+void ServerApplication::UpdateWorld() {
+	Clock::duration delta = Clock::now() - lastTick;
+	lastTick = Clock::now();
+	double d = double(delta.count()) / Clock::duration::period::den;
+	for (auto it : players) {
+		it.second.Update(d);
+	}
+}
+
+//-------------------------
+//Network loop
+//-------------------------
+
+//...
\ No newline at end of file
diff --git a/server/server_application.hpp b/server/server_application.hpp
index 254dbb5..80aecba 100644
--- a/server/server_application.hpp
+++ b/server/server_application.hpp
@@ -1,6 +1,16 @@
 #ifndef SERVERAPPLICATION_HPP_
 #define SERVERAPPLICATION_HPP_
 
+#include "defines.hpp"
+#include "packet_type.hpp"
+
+#include "config_Utility.hpp"
+#include "udp_network_utility.hpp"
+#include "vector2.hpp"
+
+#include <map>
+#include <chrono>
+
 class ServerApplication {
 public:
 	ServerApplication();
@@ -8,8 +18,40 @@ public:
 	void Init();
 	void Proc();
 	void Quit();
+
+	ServerApplication(ServerApplication const&) = delete;
 private:
-	bool running = true;
+	struct ClientData {
+		int index;
+		int channel;
+		int playerIndex;
+	};
+	struct PlayerData {
+		int index;
+		int clientIndex;
+		Vector2 position;
+		Vector2 motion;
+
+		void Update(double delta) {
+			position += motion * delta;
+		}
+	};
+
+	//game loop
+	void HandleNetwork();
+	void UpdateWorld();
+
+	//network loop
+	//...
+
+	Clock::time_point lastTick = Clock::now();
+
+	std::map<int, ClientData> clients;
+	std::map<int, PlayerData> players;
+
+	ConfigUtility configUtil;
+	UDPNetworkUtility netUtil;
+	bool running = false;
 };
 
 #endif
diff --git a/test/main.cpp b/test/main.cpp
index dba7af3..cf90d1c 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -1,13 +1,19 @@
-//#include "packet_type.hpp"
+#include "packet_type.hpp"
 #include "service_locator.hpp"
 #include "foobar.hpp"
 
+#include "vector2.hpp"
+
 #include <iostream>
 using namespace std;
 
 int main() {
 	ServiceLocator<int>::Set(new int(42));
+	ServiceLocator<Packet>::Set(new Packet());
+
 	cout << FooBar() << endl;
+
 	ServiceLocator<int>::Set(nullptr);
+	ServiceLocator<Packet>::Set(nullptr);
 	return 0;
 }
\ No newline at end of file