Patent ID: 7409549

Claim:
In a Mobility Agent supporting Mobile IP, a method of registering a Mobile Node, comprising: receiving a Mobile IP registration request packet from the Mobile Node indicating that a key to be shared by the Mobile Node and an agent with which the Mobile Node is registering is requested for purposes of registering the Mobile Node with the agent, wherein the agent with which the Mobile Node is registering is a Home Agent that is dynamically assigned to the Mobile Node; obtaining a key to be shared by the Mobile Node and the agent with which the Mobile Node is registering in response to receiving the Mobile IP registration request packet; storing the key to be shared by the Mobile Node and the agent with which the Mobile Node is registering; and sending a Mobile IP registration reply packet to the mobile node including the key to be shared by the Mobile Node and the agent with which the Mobile Node is registering, thereby enabling the Mobile Node to register with the agent, wherein the Mobile IP registration reply packet indicates that the Mobile node needs to register with the agent using the key to be shared by the Mobile Node and the agent with which the Mobile Node is registering.