Patent ID: 7502331

Claim:
In a Home Agent, a method of supporting a session in Mobile IP, comprising: receiving a first Mobile IP message identifying a Mobile Node from the Mobile Node, wherein the first Mobile IP message indicates to the Home Agent that the Mobile Node is requesting dynamic configuration of a Mobile-Home authentication key to be shared between the Mobile Node and the Home Agent during the session; obtaining a Mobile-Home authentication key to be shared between the Home Agent and the Mobile Node during the session from the first Mobile IP message or generating the Mobile-Home authentication key to be shared between the Home Agent and the Mobile Node during the session, wherein the Mobile-Home authentication key is not valid after the session has ended or during another session; allocating a home address to the Mobile Node for the session; and sending a second Mobile IP message identifying the Home Agent to the Mobile Node, the second Mobile IP message including the allocated home address for the session and a lifetime associated with the session, wherein the lifetime indicates a lifetime of the Mobile-Home authentication key, thereby enabling the Mobile Node to register with the Home Agent using the allocated home address and the Mobile-Home authentication key to be shared between the Home Agent and the Mobile Node during the session for the allocated home address.