diff --git a/include/ki/protocol/control/ClientHello.h b/include/ki/protocol/control/ClientHello.h
new file mode 100644
index 0000000..ee00b66
--- /dev/null
+++ b/include/ki/protocol/control/ClientHello.h
@@ -0,0 +1,49 @@
+#pragma once
+#include "../../util/Serializable.h"
+#include "../Packet.h"
+#include "Opcode.h"
+#include <iostream>
+#include <cstdint>
+
+namespace ki
+{
+namespace protocol
+{
+namespace control
+{
+	class ClientHello : public util::Serializable
+	{
+	public:
+		ClientHello(uint16_t session_id = 0,
+			uint64_t timestamp = 0, uint32_t milliseconds = 0);
+		virtual ~ClientHello() = default;
+
+		uint16_t get_session_id() const;
+		void set_session_id(uint16_t session_id);
+
+		uint64_t get_timestamp() const;
+		void set_timestamp(uint64_t timestamp);
+
+		uint32_t get_milliseconds() const;
+		void set_milliseconds(uint32_t milliseconds);
+
+		void write_to(std::ostream &ostream) const final;
+		void read_from(std::istream &istream) final;
+		size_t get_size() const final;
+
+		static Packet *create_packet(uint16_t session_id = 0,
+			uint64_t timestamp = 0, uint32_t milliseconds = 0)
+		{
+			ClientHello data(session_id, timestamp, milliseconds);
+			auto *packet = new Packet(true, (uint8_t)Opcode::CLIENT_HELLO);
+			packet->set_payload_data(data);
+			return packet;
+		}
+	private:
+		uint16_t m_session_id;
+		uint64_t m_timestamp;
+		uint32_t m_milliseconds;
+	};
+}
+}
+}
diff --git a/include/ki/protocol/control/Opcode.h b/include/ki/protocol/control/Opcode.h
new file mode 100644
index 0000000..8442a56
--- /dev/null
+++ b/include/ki/protocol/control/Opcode.h
@@ -0,0 +1,20 @@
+#pragma once
+#include <cstdint>
+
+namespace ki
+{
+namespace protocol
+{
+namespace control
+{
+	enum class Opcode : uint8_t
+	{
+		SERVER_HELLO = 0,
+		UDP_HELLO = 1,
+		PING = 3,
+		PING_RSP = 4,
+		CLIENT_HELLO = 5
+	};
+}
+}
+}
\ No newline at end of file
diff --git a/include/ki/protocol/control/Ping.h b/include/ki/protocol/control/Ping.h
new file mode 100644
index 0000000..dff0ed9
--- /dev/null
+++ b/include/ki/protocol/control/Ping.h
@@ -0,0 +1,50 @@
+#pragma once
+#include "../../util/Serializable.h"
+#include "../Packet.h"
+#include "Opcode.h"
+#include <cstdint>
+
+namespace ki
+{
+	namespace protocol
+	{
+		namespace control
+		{
+			class Ping : public util::Serializable
+			{
+			public:
+				Ping(uint16_t session_id = 0,
+					uint16_t milliseconds = 0, uint8_t minutes = 0);
+				virtual ~Ping() = default;
+
+				uint16_t get_session_id() const;
+				void set_session_id(uint16_t session_id);
+
+				uint16_t get_milliseconds() const;
+				void set_milliseconds(uint16_t milliseconds);
+
+				uint8_t get_minutes() const;
+				void set_minutes(uint8_t minutes);
+
+				void write_to(std::ostream &ostream) const final;
+				void read_from(std::istream &istream) final;
+				size_t get_size() const final;
+
+				static Packet *create_packet(uint16_t session_id = 0,
+					uint16_t milliseconds = 0, uint8_t minutes = 0,
+					bool response = false)
+				{
+					Ping data(session_id, milliseconds, minutes);
+					auto *packet = new Packet(true, 
+						(uint8_t)(response ? Opcode::PING_RSP : Opcode::PING));
+					packet->set_payload_data(data);
+					return packet;
+				}
+			private:
+				uint16_t m_session_id;
+				uint16_t m_milliseconds;
+				uint8_t m_minutes;
+			};
+		}
+	}
+}
diff --git a/include/ki/protocol/control/ServerHello.h b/include/ki/protocol/control/ServerHello.h
new file mode 100644
index 0000000..2c0d50e
--- /dev/null
+++ b/include/ki/protocol/control/ServerHello.h
@@ -0,0 +1,49 @@
+#pragma once
+#include "../../util/Serializable.h"
+#include "../Packet.h"
+#include "Opcode.h"
+#include <iostream>
+#include <cstdint>
+
+namespace ki
+{
+namespace protocol
+{
+namespace control
+{
+	class ServerHello : public util::Serializable
+	{
+	public:
+		ServerHello(uint16_t session_id = 0,
+			uint64_t timestamp = 0, uint32_t milliseconds = 0);
+		virtual ~ServerHello() = default;
+
+		uint16_t get_session_id() const;
+		void set_session_id(uint16_t session_id);
+
+		uint64_t get_timestamp() const;
+		void set_timestamp(uint64_t timestamp);
+
+		uint32_t get_milliseconds() const;
+		void set_milliseconds(uint32_t milliseconds);
+
+		void write_to(std::ostream &ostream) const final;
+		void read_from(std::istream &istream) final;
+		size_t get_size() const final;
+
+		static Packet *create_packet(uint16_t session_id = 0,
+			uint64_t timestamp = 0, uint32_t milliseconds = 0)
+		{
+			ServerHello data(session_id, timestamp, milliseconds);
+			auto *packet = new Packet(true, (uint8_t)Opcode::SERVER_HELLO);
+			packet->set_payload_data(data);
+			return packet;
+		}
+	private:
+		uint16_t m_session_id;
+		uint64_t m_timestamp;
+		uint32_t m_milliseconds;
+	};
+}
+}
+}