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 current
point of attachment to the Internet. While situated away from its home,
a mobile node is also associated with a care-of address, which provides
information about its current point of attachment to the Internet. The
protocol allows registration of the care-of address with a home agent.
The home agent sends datagrams destined for the mobile node through a
tunnel to the care-of address. After arriving at the end of the tunnel,
each datagram is then delivered to the mobile node. It can be used for
mobility across both homogeneous and heterogeneous media. Mobile IP
defines a set of new control messages, sent with UDP, Registration
Request and Registration Reply.
Mobile IP
Terminology:
Mobile Node (MN): A node
capable of performing network roaming
Home Agent (HA): IP address
of the mobile node's home agent (such as a router).
Foreign Agent (FA): IP
address of the mobile node's foreign agent (such as a router).
Care of Address (CA):
Address of the end-of-tunnel towards the mobile node
Correspondent Node (CN):
The other node that the MN is communicating with
Home Address :
Mobile’s permanent IP address
Mobile IP References:
Princeton University Tutorial
Mobile Networking Through Mobile IP
Mobile IP Protocol Info
Wikipedia
-Mobile IP
Mobile IP Simulator for the Agilent E5515C
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