Mobile IP is a communication protocol created by extending the Internet protocol, IP. The full name of Mobile IP is Mobile Internet Protocol. It is also called MIP. It is a standard communication protocol through which mobile users can move from one network to another via a permanent IP address, ie the IP address of the users does not change when moving to another network. It has been defined in internet engineering task force (IETF) RFC 2002.
Mobile IP is based on internet protocol, so it is scalable to the Internet. Any media that supports IP can also support mobile IP.
Element Mobile IP ( Components Of Mobile IP)
- Mobile Node (MN)
- Home Agent (HA)
- Foreign Agent (FA)
- Home Network (HN)
- Foreign Network (FN)
- Corresponding Node (CN)
- Care of Address (COA)
A mobile node is a device or a user or a router that can often change the state of its network without changing its original IP address. Examples of mobile nodes are cell phones, personal digital assistant (PDA), laptops etc. Mobile Node has roaming facilities.
A home agent is a router in a home network. It acts as an anchor point for communication with the mobile node. Which helps in communicating with the mobile node. It stores the complete information of the mobile nodes and it sends the data through tunnel through the correspondent node to the roaming mobile node.
A foreign agent is a router that provides many services such as tunneling a data node whenever a mobile node moves into a foreign network. Then the home agent sends the IP address to the care-of-address, after that the care-of-address sends it to the foreign agent and finally the foreign agent sends this IP address to the mobile device.
The home network is the base station network, this network does not require any mobile IP support.
All the networks except the home network which have a registered IP in the mobile node are called foreign networks.
Partner nodes that are used for communication with mobile nodes are called corresponding nodes.
Care of address
It is a temporary address used by a mobile node when it goes out of its home network.
Methodology of mobile IP ( Working Of Mobile IP)
The function of Mobile IP can be described in 3 steps:
1. Agent Discovery
In this, mobile nodes discover their foreign and home agents. Home agents and foreign agents advertise their services on the network using the ICMP Router Discovery Protocol (IRDP).
The main purpose of registration is to inform the home agent of the current location to forward the packet correctly. In this, the mobile node registers its current location with foreign agent and home agent.
It is used to establish a virtual connection as a pipe to transfer data packets between the tunnel entry and the tunnel endpoint. Tunneling is also known as “port forwarding”
Mobile IP Application ( Applications Of Mobile IP)
- Mobile IP technology is used in many applications where network connectivity and sudden change in IP address can cause problems. It was designed to have simple and continuous Internet connectivity.
- It is used in many wired and wireless devices where users have to move their mobile devices to multiple LAN subnets.
- Although mobile IP is not required in cellular systems such as 3G, it is often used for different packet data serving node (PDSN) domains in 3G systems.
Benefits of Mobile IP ( Advantage Of Mobile IP)
- Through this we can use internet without any problem.
- Through this we can also use our mobile in roaming.
Drawbacks of Mobile IP ( Disadvantage Of Mobile IP)
Its one problem is that in mobile devices sometimes the signal becomes weak and internet does not run even after the signal.