THE WHATIS.COM WORD-OF-THE-DAY September 9, 2002 care-of address ______________ TODAY'S SPONSOR: VeriSign - The Value of Trust
Secure all your Web servers now - with a proven 5-part strategy. The FREE Server Security Guide shows you how to deploy the latest encryption and authentication techniques, deliver transparent protection with the strongest security without disrupting users, and more. Get your FREE Guide now: http://WhatIs.com/r/0,,5471,00.htm?FreeGuide ______________ TODAY'S WORD: care-of address See our definition with hyperlinks at http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci849669,00.html In Internet routing, a care-of address is a temporary IP address for a mobile node (mobile device) that enables message delivery when the device is connecting from somewhere other than its home network. The care-of address identifies a mobile node's current point of attachment to the Internet and makes it possible to connect from a different location without changing the device's home address (permanent IP address). This works similarly to the way the postal system might forward letters through a care-of address: messages sent to the known permanent address are rerouted to the care-of address while the recipient can be reached there. Thus, the recipient avoids having to change their official address to the temporary one when they change their location, and change it back again when they return home. When a mobile device is away from its home network, it is assigned a care-of address. This may be a foreign agent care-of address, which is the static IP address of a foreign agent on a visited network, or a co-located care-of address, which is a temporary IP address assigned to the mobile node. A co-located care-of address may be acquired through some means such as Dynamic Host Configuration Protocol (DHCP), or may be a longer-term address assigned a device for connecting through a specific foreign network. Mobile IP, as defined in the Internet Engineering Task Force (IETF) RFC 2002 specifications, registers the care-of address with a home agent, which resides on the home network. When a message for the mobile node is delivered to the home network, the home agent intercepts the message and tunnels it to the recipient at the care-of address. RELATED TERMS: routing http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212924,00.html IP address http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci212381,00.html home network http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213434,00.html DHCP http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213894,00.html Engineering Task Force http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci214017,00.html tunnel http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci213230,00.html ______________________ SELECTED LINKS: The IETF provides a draft of the Mobile IP specification (RFC 2002). http://www.ietf.org/rfc/rfc2002.txt SearchNetworking.com has an article called "Mobile IP: The Unsung Hero." http://searchnetworking.techtarget.com/originalContent/0,289142,sid7_gci554837,00.html SearchNetworking.com offers Best Web Links to information about "Wireless in the Enterprise." http://searchnetworking.techtarget.com/bestWebLinks/0,289521,sid7_tax286411,00.html ______________________ WHATIS DISCUSSION FORUM | Challenge #14: Help! Am I infected? Kent's kids finally talked him into getting a home computer so the family could stay connected via e-mail. When Kent got a virus alert about an e-mail attachment, he called his oldest son to find out what he should do next. Should he leave the e-mail alone? Should he write back to whoever sent the infected e-mail and let them know they sent him a virus? THE CHALLENGE: Does the virus alert mean that Kent's computer is infected? What should he do next? http://whatis.discussions.techtarget.com/WebX?[EMAIL PROTECTED]@.1dcfae0e/129 ______________________ QUIZ #9 | Wireless How much do you know about IT protocols? Take our quiz and find out! http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci752723,00.html ______________________________ RECENT ADDITIONS AND UPDATES [1] satellite news gathering http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci849644,00.html [2] rack-mounted http://whatis.techtarget.com/definition/0,,sid9_gci847923,00.html [3] transconductance http://whatis.techtarget.com/definition/0,,sid9_gci214200,00.html [4] HDMI http://whatis.techtarget.com/definition/0,,sid9_gci847398,00.html [5] direct broadcast satellite http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci848373,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Assistant Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Published by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2002, All Rights Reserved. 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