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Additional info for Ad hoc mobile wireless networks - principles, protocols and applns

Sample text

This process is called “registration,” and is transacted between the mobile computer and the home agent each time the mobile computer changes its point of attachment and receives a new care-of address. Often, the care-of address is advertised by an entity known as a foreign agent, which is located nearby the mobile computer and relays the registration messages back and forth between the mobile node and the home agent. Other times, the mobile computer itself acquires a care-of address by other means (notably, via the Dynamic Host Configuration Protocol [DHCP]) and assigns that care-of address to one of its own interfaces.

Home agents use agent advertisements to make themselves known, even if they do not offer any care-of addresses. However, it is not possible to associate preferences to the various care-of addresses in the router advertisement, as is the case with default routers. The IETF working group was concerned that dynamic preference values might destabilize the operation of Mobile IP. Because no one could defend static preference assignments except for backup mobility agents, which do not help distribute the routing load, the group eventually decided not to use the preference assignments with the care-of address list.

Use power efficiently, because most devices will run on batteries or fuel cells for at least a few hours on a single charge. � Scale up to support millions of active devices, or more, within a single metro­ politan region. 2 Mobile Internet Protocol (IP) Mobile IP is an emerging set of protocols created by the Internet Engineering Task Force (IETF). Basically, it is a modification to IP that allows nodes to continue to receive packets, independently of their connection point to the Internet.

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