Methods and apparatus for enabling a node that does not support Mobile IP
to roam from a first Foreign Agent to a second Foreign Agent are
disclosed. In a Foreign Agent that supports Mobile IP, a method of
registering a node that does not support Mobile IP with a Home Agent that
supports Mobile IP includes detecting a node in a vicinity of the Foreign
Agent, composing a registration request specifying a node ID associated
with the node, and sending the registration request to the Home Agent.
When the Home Agent receives the registration request from a first Foreign
Agent, the Home Agent updates a mobility binding table to associate the
first Foreign Agent with the node. In addition, the Home Agent notifies a
second Foreign Agent to update its visitor table to reflect roaming of the
node from the second Foreign Agent to the first Foreign Agent.
