Methods and apparatus for sending a registration request packet on behalf of a node that supports PPP but does not support Mobile IP is implemented in a Foreign Agent. The method comprises accepting a call from the node and receiving authentication information associated with a PPP authentication protocol...http://www.google.ca/patents/US7152238?utm_source=gb-gplus-sharePatent US7152238 - Enabling mobility for point to point protocol (PPP) users using a node that does not support mobility
