1.INTRODUCTION
Mobile IP is a proposed standard protocol that builds on
the Internet Protocol by making mobility transparent to applications and
higher-level protocols like TCP. This paper aims at discussing the design
principles of Mobile IP and how it can be incorporated with the already
existing Internet architecture.
Mobile Internet Protocol is a new recommended Internet protocol
designed to support the mobility of a user (host). Host mobility is becoming
important because of the recent blossoming of laptop computers and the high
desire to have continuous network connectivity anywhere the host happens to be.
The development of Mobile IP makes this possible.
There are mainly three processes in Mobile IP:
1.Agent Discovery:
The process by which a Mobile node determines its current location and obtains the care of address.
The process by which a Mobile node determines its current location and obtains the care of address.
2.Registration:
The process by which a Mobile node request service from a foreign agent on foreign link and informs its home agent of its current care-off address.
The process by which a Mobile node request service from a foreign agent on foreign link and informs its home agent of its current care-off address.
3.Tunneling:
The specific mechanism by which packets are routed to and from a Mobile node that is connected to a foreign link.
The specific mechanism by which packets are routed to and from a Mobile node that is connected to a foreign link.
2.
Terminology
Mobile IP
introduces the following new functional entities:
Mobile node – A mobile node is a host or a
router that changes its point of attachment from one network or sub network to
another. A mobile node may change its location without changing its IP address.
It may continue to communicate with other Internet nodes at any location using
its (constant) IP address, assuming link-layer connectivity to a point of
attachment is available.
Home
agent – A home agent is a router on a mobile node’s home network
that tunnels datagrams for delivery to the mobile node when it is away from
home and maintains current location information for the mobile node.
Foreign agent – A foreign agent is a router
on a mobile node’s visited network that provides routing services to the mobile
node while registered. The foreign agent detunnels and delivers datagrams to
the mobile node that were tunneled by the mobile node’s home agent. The foreign
agent may always be selected as a default router by registered mobile nodes.
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