Mobile IP is a standard that allows users with mobile devices
whose IP addresses are associated with one network to stay
connected when moving to a network with a different IP address.
Mobile IP provides an efficient, scalable mechanism for node
mobility within the Internet. Using Mobile IP, nodes may change
their point-of-attachment to the Internet without changing their
IP address. This allows them to maintain transport and higher-
layer connections while moving. Node mobility is realized
without the need to propagate host-specific routes throughout
the Internet routing fabric. When a user leaves the network with
which his device is associated (home network) and enters the
domain of a foreign network, the foreign network uses the Mobile
IP protocol to inform the home network of a care-of address to
which all packets for the user's device should be sent. The
Mobile IP protocol enables nodes to move from one IP subnet to
another. Each mobile node is always identified by its home
address, regardless of its curr