This document defines Mobile IP, a protocol that allows IP datagrams to be transparently routed to mobile nodes regardless of their current point of attachment to the Internet. Mobile nodes are always identified by their home address, and when away from home, they are associated with a care-of address that indicates their current point of attachment. The home agent registers the care-of address and tunnels datagrams to the mobile node. The protocol supports registration, authentication, and mobility management, enabling nodes to change their point of attachment without changing their IP address. Mobile IP introduces new architectural entities: mobile nodes, home agents, and foreign agents. Mobile nodes can communicate with other nodes using their home address, even when away from home. Home agents tunnel datagrams to the mobile node's care-of address, while foreign agents provide routing services and may act as default routers for registered mobile nodes. The protocol defines message formats, extensions, and procedures for agent discovery, registration, and routing. Agent discovery allows mobile nodes to determine their current network and detect when they have moved. Registration enables mobile nodes to register their care-of address with their home agent, and the home agent forwards datagrams to the mobile node. The protocol supports two types of care-of addresses: foreign agent care-of addresses and co-located care-of addresses. Mobile IP provides mechanisms for authentication, security, and mobility management. It supports various extensions for agent discovery, registration, and routing. The protocol is designed to be scalable and efficient, minimizing administrative messages and power consumption for mobile nodes. It is applicable for both homogeneous and heterogeneous media, and is suitable for node mobility across different networks. Mobile IP is less suitable for micro-mobility applications, such as handoffs between wireless transceivers. The protocol is intended to be used in conjunction with standard IP routing mechanisms and is designed to be compatible with existing IP infrastructure.This document defines Mobile IP, a protocol that allows IP datagrams to be transparently routed to mobile nodes regardless of their current point of attachment to the Internet. Mobile nodes are always identified by their home address, and when away from home, they are associated with a care-of address that indicates their current point of attachment. The home agent registers the care-of address and tunnels datagrams to the mobile node. The protocol supports registration, authentication, and mobility management, enabling nodes to change their point of attachment without changing their IP address. Mobile IP introduces new architectural entities: mobile nodes, home agents, and foreign agents. Mobile nodes can communicate with other nodes using their home address, even when away from home. Home agents tunnel datagrams to the mobile node's care-of address, while foreign agents provide routing services and may act as default routers for registered mobile nodes. The protocol defines message formats, extensions, and procedures for agent discovery, registration, and routing. Agent discovery allows mobile nodes to determine their current network and detect when they have moved. Registration enables mobile nodes to register their care-of address with their home agent, and the home agent forwards datagrams to the mobile node. The protocol supports two types of care-of addresses: foreign agent care-of addresses and co-located care-of addresses. Mobile IP provides mechanisms for authentication, security, and mobility management. It supports various extensions for agent discovery, registration, and routing. The protocol is designed to be scalable and efficient, minimizing administrative messages and power consumption for mobile nodes. It is applicable for both homogeneous and heterogeneous media, and is suitable for node mobility across different networks. Mobile IP is less suitable for micro-mobility applications, such as handoffs between wireless transceivers. The protocol is intended to be used in conjunction with standard IP routing mechanisms and is designed to be compatible with existing IP infrastructure.