Mobile IP goals in mobile computing
ABSTRACT
Mobile IP is an internet protocol designed to support host mobility. Its goal is to provide the ability of a host to stay connected to the internet regardless of their location. Mobile IP is able to track a mobile host without needing to change the mobile host's long-term IP address.
Mobile Internet Protocol (IP) 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. This paper describes and summarizes the characteristics of the current Internet draft for Mobile IP. In addition to the current internet draft, this paper also discusses alternative Mobile IP proposals so that the reader may understand the different design issues associated with the different protocols.
Features:
Mobile IP has several features associated with it:
No geographical limitations:
A user can take a palmtop or laptop computer anywhere without losing the connection to the home network.
No physical connection required:
Mobile IP finds local IP routers and connects automatically. It is phone jack and wire free.
Modifications to other routers and hosts is not required:
Other than mobile nodes/routers, the remaining routers and hosts will still use current IP. Mobile IP leaves transport and higher protocols unaffected.No modifications to the current IP address and IP address format:
The current IP address and address format remains the same.Supports security:
Authentication is performed to ensure that rights are being protected.Entities:
Mobile Node (MN):
A host or router that may change its point of attachment from one network or subnetwork to another through the internet. This entity is pre-assigned a fixed home address on a home network, which other correspondent hosts will use to address their packets to, regardless of its current location.
Home Agent (HA):
A router that maintains a list of registered mobile nodes in a visitor list. It is used to forward mobile node-addressed packets to the appropriate local network when the mobile nodes are away from home. After checking with the current mobility bindings for a particular mobile node, it encapsulates (see below) datagrams and sends it to the mobile host's current temporary address when the mobile node.Foreign Agent (FA):
A router that assists a locally reachable mobile node that is away from its home network. It delivers information between the mobile node and the home agent.Care-of-address (COA):
An address which identifies the mobile node's current location. It can be viewed as the end of a tunnel (see below) directed towards a mobile node. It can be either assigned dynamically or associated with its foreign agent.Correspondent Node (CN):
This node sends the packets which are addressed to the mobile node.Home Address:
A permanent IP address that is assigned to a mobile node. It remains unchanged regardless of where the mobile node is attached to the internet.Mobility Agent:
An agent which supports mobility. It could be either a home agent or a foreign agent.
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