21-12-2012, 02:38 PM
Mobile IP
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Introduction
The Mobile IP protocol allows location-independent routing of IP datagrams on the Internet. Each mobile node
is identified by its home address disregarding its current location in the Internet. While away from its home
network, a mobile node is associated with a care-of address which identifies its current location and its home
address is associated with the local endpoint of a tunnel to its home agent. Mobile IP specifies how a mobile
node registers with its home agent and how the home agent routes datagrams to the mobile node through the
tunnel.
Applications
In many applications (e.g., VPN, VoIP), sudden changes in network connectivity and IP address can cause
problems. Mobile IP was designed to support seamless and continuous Internet connectivity.
Mobile IP is most often found in wired and wireless environments where users need to carry their mobile
devices across multiple LAN subnets. Examples of use are in roaming between overlapping wireless systems,
e.g., IP over DVB, WLAN, WiMAX and BWA.
Performance
A performance evaluation of Mobile IPv6 can be found in.[1] Additionally, a performance comparison between
Mobile IPv6 and some of its proposed enhancements (Hierarchical Mobile IPv6, Fast Handovers for Mobile
IPv6 and their Combination) is available at.[2]
Development
Enhancements to the Mobile IP technique, such as Mobile IPv6[3] and Hierarchical Mobile IPv6 (HMIPv6)
defined in RFC 5380 (http://tools.ietfhtml/rfc5380) ,[4] are being developed to improve mobile
communications in certain circumstances by making the processes more secure and more efficient. HMIPv6
explanation can be found at Hierarchical-Mobile-IPv6
(http://searchmobilecomputing.techtargetd...obile-IPv6) .
Definition of terms
Home network
The home network of a mobile device is the network within which the device receives its identifying IP
address (home address).
Home address
The home address of a mobile device is the IP address assigned to the device within its home network.
Foreign network
A foreign network is the network in which a mobile node is operating when away from its home network.
Care-of address
The care-of address of a mobile device is the network-native IP address of the device when operating in
a foreign network.