What is Mobile IP?
The Mobile Internet Protocol, or better known as Mobile IP, is a protocol that adds to the already existing Internet Protocol by making the movement of a node transparent to applications on its original network. Problem with the Internet Protocol One knows that a host address is made up of a network number and a host part. This network number tells the user what network the host is attached to. Original Internet Protocol algorithms tell certain routers how to get packets to their correct networks. Now with the regular Internet Protocol if the host disconnected itself from its original network and joined another network, the host would never receive any packets because the host has the same IP address from its old network that would not be recognized by the network in which it joined. In essence the host would seem to be missing because its IP address does not match its new network number and therefor would never recieve any packets. Solution Because this problem exists, Mobile IP was c
One corner stone of the Mobile VPN is the Mobile IP technology. ipUnplugged has focused its product development on the Internet Engineering Task Force (IETF) standard Mobile IP. The Mobile IP standard is specified by RFC 3344 and is the only standard for mobility across different kinds of IP-networks. Mobility, in this context, refers to the ability of computers and handheld devices to move between networks as the user moves through his day. To make this possible, the device has to be equipped with logic to find and select available networks. More importantly, as the user moves, the connection and the existing communication must be kept up and running. In technical terms, this means that the computer may not change its identity (IP-address) and that all communication based on UDP or TCP will keep flowing. Imagine synchronizing your e-mails. In the middle of the synchronization, you need to run into a meeting. Just unplug your laptop and Mobile IP will ensure that communication is conti
Mobile IP is a communications protocol developed by the Internet Engineering Task Force. The design of this IETF protocol is configured to make it possible for consumers who use mobile communication devices to be able to move from one network to another, without having to make a change in their IP address. The function of Mobile IP allows the forwarding of Internet traffic to the mobile device even when the device is not connected to the home network. The creation of Mobile IP meant a significant change in the way information terminates across the Internet. Generally, the routing of information depends on relaying data to IP addresses that are considered fixed in location. With the advent of Mobile IP, this all changed. Instead of basing the termination on a fixed location associated with an IP address, the protocol calls for delivery of data to an IP address that may or may not be currently connected through the mother or home network. Still, the assignment of a home address on a home
What Mobile IP provides, Mobility requirements, Where Mobile IP is required, where mobile IP is not required, DHCP as an alternative, Proxy ARP as an alternative. Architecture Mobile node, home network, home agent, Foreign agent, Fixed home address, Care of address, Correspondent node, Tunnelling. How Mobile IP works Using two addresses, issues with TCP, discovering the care of address, registering care of address, tunnelling the care of address. The protocols involved. Issues with Mobile IP Routing inefficiencies, Security and firewalls, ingress filtering, QoS. MIP and IPv6 Stateless address configuration, Neighbour discovery, miscellaneous.
“Each mobile node is always identified by its home address, regardless of its current point of attachment to the Internet. While situated away from its home, a mobile node is also associated with a care-of address, which provides information about the mobile node’s current location. IPv6 packets addressed to a mobile node’s home address are transparently routed to its care-of address via the mobile nodes Home Agent (HA). The protocol enables IPv6 nodes to cache the binding of a mobile node’s home address with its care-of address, and then to send any packets destined for the mobile node directly to it at this care-of address.” — draft-ietf-mipv6-24, page 1-2.
