Study About Synchronizing Mobile Ip Networks

Essay add: 24-10-2015, 21:30   /   Views: 317

Mobile IP is an upcoming service in the broadband business for mobile service providers. To derive revenue, high bandwidth must be offered to the users at low cost and be augmented with value added services.The motive of mobile IP is to enable the users to use their static IP for accessing Internet with mobility. Ultimately for deploying a standards-based synchronization solution for next generation mobile networks is the key to investment protection, as well as meeting long term requirements.

A platform for universal synchronization is the most cost-effective, more robust and also plays a large part in the optimization of the network.


The Mobile IP is an open standard, released by the Internet Engineering Task Force (IETF) as RFC 2002, which allow users to use the same home IP address to stay connected, and use the applications even while the user is not located at its home destination. This scenario is possible only when the home IP address and Care of Address (CoA) are synchronized. Mobile IP has a feature of scalability for the Internet as it is based on IP to any portable media that can support IP address and can support synchronizing Mobile IP's.

Thus objective is focused on the methodology and technologies being used to enable synchronizing mobile IP networks.


The scope that would be covered under the topic is to focus on what is understood by Synchronizing Mobile IP Networks, its working, applications using Mobile IP and other features of Mobile IP networks.


The Mobile Internet Protocol allows the user for location-independent routing of IP data-grams over the Internet. Every mobile node is identified from its static home IP address irrespective of its current geographical location. The user will be associated to CoA(Care of Address) while being away from its home network. This CoA will identify the user's current location and synchronize the home IP address with the CoA using the local endpoint of a tunnel of its home IP agent.

The mobile IP agent specifies how a mobile's node can register with the respective home agent and also how these home agents' route the data-grams to the mobile node through the tunnel using the tunneling protocol and binding the home and CoA IP's for accessing Internet.Mobility in IP addresses provides an efficient, scalable mechanism for roaming within the Internet. The mobile nodes may change their point-of-attachment for the Internet without changing their static home IP address. This allows the user to maintain higher-layer connections even while roaming in any geographical location.

The node mobility of an IP is realized without the requirement to propagate the host specific route through the Internet routing.


In Mobile IP technology is often found in the wired and wireless environments, where the users need to move with their mobile devices across the multiple LAN networks of the world. It is best suited for devices used for overlapping various wireless systems. Presently, the mobile IP is no more required within a cellular system like 3G, so as to provide transparency when the users migrate between multiple cellular towers, and since these cellular systems provide their own data link layer handover and roaming facilities.

In many applications (e.g., VoIP, VPN) sudden changes in the network connectivity and their IP addresses may cause problems for the Internet users.

Working Of Mobile Internet Protocol (IP)

Any mobile IP node can have 2 addresses, one a permanent static home address and second a Care of Address associated with the network which the mobile IP node is visiting. Thus there are two types of entities for a Mobile IP:The home IP agent stores the information about all mobile nodes whose permanent and static home address is in the home mobile IP agent's networkThe foreign IP agent stores the information about all mobile nodes visiting this network. Mobile foreign agents also emphasize on CoA, which in-turn are used by the Mobile IP's.The node wanting to communicate with the mobile node will use the permanent static home address of the mobile nodes as the destination addresses to send packets over the Internet.

The home IP address belongs logically with the network linked with the home IP agent, and the normal IP address routing mechanisms will forward these packets to the destination address i.e the home address. Therefore by forwarding these packets to a destination which is physically present in the same network as the home IP agent, and the agent redirects these packets towards the foreign IP agent using a tunneling protocol by encapsulating the datagram through the IP tunnel with a fresh IP header using the CoA of a mobile node.The mobile device acts as a transmitter node and sends these packets directly to the corresponding communicating node with the help of the foreign IP agent, even without sending these packets through the home IP agent, by using its permanent static home addresses as the source addresses for the IP datagram packets in the Internet. This is known as triangular routing.

The foreign IP agent could only employ the reverse tunneling mechanism by tunneling the mobile IP node's datagram packets to the home IP agent, which will in-turn, forward them to the respective communicating nodes, whenever it is required. This will be needed in the networks where the gateway routers have extensive filtering enabled and thus the source mobile IP address of the mobile IP host would need to belong, to the same subnet of the foreign IP network or else the datagram packets will be discarded by the gateway routers.

Synchronizing of Mobile IP Networks

Synchronizing of Mobile IP on network can be achieved by using the Tunneling Protocol, through which the IP address can be provided to the next generation Wireless mobile devices. The home address IP is bind with the CoA so that the synchronization is maintained among all the IPs .The home IP agent finds the mobile IP node's CoA and gives a new IP header which contains the mobile IP node's CoA as the destination IP address of the mobile device. The original IP datagram packets are put into the payload of the IP packet. It is then send with the packet.

This process of encapsulating one IP packet into the payload of another is known as IP-within-IP encapsulation, or tunneling.


To conclude, Synchronization between the home address IP and CoA IP can be achieved using the tunnel protocols and binding the two IP's. Mobile IP network is a revolution for the next generation Wireless mobile devices. This will not only ease the complexity of multiple IP addresses for users, as well as increase the reliability and security for the user over the Internet.

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