Seminar technical
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Transcript of Seminar technical
Introduction
Mobile IP Entities
Mobile IP Process
Security in Mobile IP
Problems with Mobile IP
Mobility in IPV6
Applications of Mobile IP
Conclusion
Outlines
Mobile IP was designed to allow mobile device users to move from one network to another .
Enables hosts to stay connected to the Internet regardless of their location.
Enables hosts to be tracked without needing to change their IP address.
Requires no changes to software of non-mobile hosts/routers.
Has no geographical limitations.
Supports security.
Standardized by IETF .
Introduction
1)Mobile Node (MN)
The entity that may change its point of attachment from network to network in the Internet.
Detects it has moved and registers with “best” FA.
Assigned a permanent IP called its home address to which other hosts send packets regardless of MN’s location.
Since this IP doesn’t change it can be used by long-lived applications as MN’s location changes.
Mobile IP Entities
2)Home Agent (HA)
This is router with additional functionality
Located on home network of MN
Does mobility binding of MN’s IP with its COA
Forwards packets to appropriate network when MN is away
Home Network
The network within which the device receives its Home address
Mobile IP Entities Contd.
3)Foreign Agent (FA)
Another router with enhanced functionality
If MN is away from HA the it uses an FA to send/receive data to/from HA
Advertises itself periodically
Forward’s MN’s registration request
Foreign Network
Network in which the Mobile Node is away from its Home network.
Mobile IP Entities Contd.
Care-of-address (COA)
Address which identifies MN’s current location
Sent by FA to HA when MN attaches
Usually the IP address of the FA
Correspondent Node (CN)
End host to which MN is corresponding (eg. a web server)
Mobile IP Entities Contd.
The Mobile IP process has three main phases.
Agent Discovery - A mobile node discovers its foreign agents and home agents during agent discovery.(Agent advertisement)
Registration - The mobile node registers its current location with the foreign agent and home agent during registration.(Set up routing mechanism for transporting packet)
Data Transfer- MN can communicate with CN
Mobile IP Process
Authentication can be performed by all parties
Only authentication between MN and HA is required
Keyed MD5 is the default
The hash-based message authentication code (HMAC)
HA and FA do not have to share any security information.
Security in Mobile IP
“Triangle” routing
The Correspondent Node (CN) has to send packets to the Mobile Node (MN) via the Home Agent (HA),while the MN sends packets directly to the CN.
Problems with Mobile IP
Single HA model is easily broken
Frequent reports to HA if MN is moving
Security-Hijacking
Other Mobile IP Problems
Route Optimization is a fundamental part of Mobile IPv6
Mobile IPv4 it is an optional set of extensions that may not be supported by all nodes
Foreign Agents are not needed in Mobile IPv6
MNs can function in any location without the services of any special router in that location
Security
Nodes are expected to employ strong authentication and encryption
Mobility in IPv6
If route optimization is used, the MN and the CN can, after performing the correspondent registration process, communicate with each other directly without the need for sending data packets through the HA and tunneling between the HA and the MN is not needed.
Here data packet sent from the MN to the CN using route optimization.
Route Optimization
In many applications 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
Applications of Mobile IP
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communications standard designed to provide 30 to 40 megabit per second data rates.
The bandwidth and range of WiMAX make it suitable for the following potential applications:
Providing portable mobile broadband connectivity across cities and countries through a variety of devices.
Providing a wireless alternative to cable and digital subscriber line (DSL) for "last mile" broadband access.
WiMAX can provide at home or mobile Internet access across whole cities or countries.
WIMAX
Mobile IP is the new generation technology to bring wireless data communication in to common use.
Mobile IP will play an increasingly important part in the deployment of future Internet mobile networking.
Mobile IPv6 is
An efficient protocol for handling mobility with IPv6
To minimize the control traffic needed to effect mobility
Conclusion