diff --git a/message.hpp b/message.hpp
new file mode 100644
index 0000000..b6b4131
--- /dev/null
+++ b/message.hpp
@@ -0,0 +1,108 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+
+namespace message
+{
+
+enum class PayloadType : uint8_t
+{
+    IPMI                  = 0x00,
+    OPEN_SESSION_REQUEST  = 0x10,
+    OPEN_SESSION_RESPONSE = 0x11,
+    RAKP1                 = 0x12,
+    RAKP2                 = 0x13,
+    RAKP3                 = 0x14,
+    RAKP4                 = 0x15,
+    INVALID               = 0xFF,
+};
+
+/*
+ * @ struct Message
+ *
+ * IPMI message is data encapsulated in an IPMI Session packet. The IPMI
+ * Session packets are encapsulated in RMCP packets, which are encapsulated in
+ * UDP datagrams. Refer Section 13.5 of IPMI specification(IPMI Messages
+ * Encapsulation Under RMCP). IPMI payload is a special class of data
+ * encapsulated in an IPMI session packet.
+ */
+struct Message
+{
+    static constexpr uint32_t MESSAGE_INVALID_SESSION_ID = 0xBADBADFF;
+
+    Message()
+        : payloadType(PayloadType::INVALID),
+          rcSessionID(Message::MESSAGE_INVALID_SESSION_ID),
+          bmcSessionID(Message::MESSAGE_INVALID_SESSION_ID) {}
+
+    ~Message() = default;
+    Message(const Message&) = default;
+    Message& operator=(const Message&) = default;
+    Message(Message&&) = default;
+    Message& operator=(Message&&) = default;
+
+    bool isPacketEncrypted;         // Message's Encryption Status
+    bool isPacketAuthenticated;     // Message's Authentication Status
+    PayloadType payloadType;        // Type of message payload (IPMI,SOL ..etc)
+    uint32_t rcSessionID;           // Remote Client's Session ID
+    uint32_t bmcSessionID;          // BMC's session ID
+    uint32_t sessionSeqNum;         // Session Sequence Number
+
+    /*
+     * “Payloads” are a capability specified for RMCP+ that enable an IPMI
+     * session to carry types of traffic that are in addition to IPMI Messages.
+     * Payloads can be ‘standard’ or ‘OEM’.Standard payload types include IPMI
+     * Messages, messages for session setup under RMCP+, and the payload for the
+     * “Serial Over LAN” capability introduced in IPMI v2.0.
+     */
+    std::vector<uint8_t> payload;
+};
+
+namespace LAN
+{
+
+namespace header
+{
+
+// IPMI LAN Message Request Header
+struct Request
+{
+    uint8_t rsaddr;
+    uint8_t netfn;
+    uint8_t cs;
+    uint8_t rqaddr;
+    uint8_t rqseq;
+    uint8_t cmd;
+} __attribute__((packed));
+
+// IPMI LAN Message Response Header
+struct Response
+{
+    uint8_t rqaddr;
+    uint8_t netfn;
+    uint8_t cs;
+    uint8_t rsaddr;
+    uint8_t rqseq;
+    uint8_t cmd;
+} __attribute__((packed));
+
+} // namespace header
+
+namespace trailer
+{
+
+// IPMI LAN Message Trailer
+struct Request
+{
+    uint8_t checksum;
+} __attribute__((packed));
+
+using Response = Request;
+
+} // namespace trailer
+
+} // namespace LAN
+
+} // namespace message
+