Write a short note on mobile ip benefits
Mobile ip notes
Mobile IP creates the perception that the mobile node is always attached to its home network. Instead of forwarding these packets to a destination that is physically in the same network as the home agent, the home agent redirects these packets towards the remote address through an IP tunnel by encapsulating the datagram with a new IP header using the care of address of the mobile node. While discovery of a care-of address is still required, a mobile node can configure its a care-of address by using Stateless Address Autoconfiguration and Neighbor Discovery. First, on a practical level, IPv6 standards documents are still at an early stage of standardization, so it is possible to place additional requirements on IPv6 nodes. Solaris Mobile IP supports only privately addressed mobile nodes. Zao et al. When a mobile node has a private address, the mobile node can only communicate with a correspondent node through a reverse tunnel. Although the North American mobile trend is not moving as quickly as some other markets, the growing adoption of mobile communications elsewhere is likely to drive acceptance globally. Castineyra, J. Johnson and C. Nevertheless, the fact that products exhibiting this model are currently economically viable cannot be denied. Tunneling establishes a virtual pipe for the packets available between a tunnel entry and an endpoint. Home address The home address of a mobile device is the IP address assigned to the device within its home network. Alexander and R.
To secure the registration request, each request must contain unique data so that two different registrations will in practical terms never have the same MD5 hash.
Finally, at the subnet level, routers look at the bits identifying a particular device.
Conta and S. Foreign agent A foreign agent is a router that stores information about mobile nodes visiting its network.
Correspondent node in mobile ip
Foreign Network: It is the current network to which the mobile node is visiting away from its home network. Instead of forwarding these packets to a destination that is physically in the same network as the home agent, the home agent redirects these packets towards the remote address through an IP tunnel by encapsulating the datagram with a new IP header using the care of address of the mobile node. Slow growth in the wireless LAN market. Consequently, correspondent nodes can use routing headers without penalty. 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. However, each node can communicate with nodes in its corresponding home agent's administrative domain through the reverse tunnel. This method of automatic home agent discovery works by using a broadcast IP address instead of the home agent's IP address as the target for the registration request. The care-of address changes at each new point of attachment and can be thought of as the mobile node's topologically significant address; it indicates the network number and thus identifies the mobile node's point of attachment with respect to the network topology. This modification can be understood as a packet transformation or, more specifically, a redirection. Home agents use agent advertisements to make themselves known, even if they do not offer any care-of addresses. The need to authenticate registration information has played a major role in determining the acceptable design parameters for Mobile IP. Many people believe that computer communications to laptop computers are sufficiently bursty that there is no need to increase the reliability of the connections supporting the communications. The Cellular Digital Packet Data CDPD , 7 for example, has created a widely deployed communications infrastructure based on a previous draft specification of the protocol.
To ensure this does not happen, Mobile IP includes within the registration message a special identification field that changes with every new registration. Packets delivered by encapsulation instead of by source routes in a routing header must have been sent by correspondent nodes that need to receive binding updates from the mobile node.
Competition from other protocols.
Perkins and J. This is especially convenient in a wireless LAN office environment, where the boundaries between attachment points are not sharp and are often invisible.
This modification can be understood as a packet transformation or, more specifically, a redirection.
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