THE WHATIS.COM WORD-OF-THE-DAY December 3, 2003 route poisoning
______________________ SPONSORED BY: IBM What do you need to make decisions on demand? Smart decisions. Timely decisions. You need accurate information flow. A Business Portal from IBM WebSphere gives employees, suppliers, customers and partners personalized access to the information they need, when are where they need it. The result: Faster, smarter decisions. On demand. See what a Business Portal can do for you. Get your guide to WebSphere Business Portals. http://www.ibm.com/websphere/news/portalwp ______________________ TODAY'S WORD: route poisoning See our complete definition with hyperlinks at http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci939324,00.html?track=NL-34 Route poisoning is a method of preventing a network from sending packets through a route that has become invalid. When the routing protocol detects an invalid route (such as can be caused by a severed cable or the failure of a network node), all of the routers in the network are informed that the bad route has a hop count of 16, which stands for infinity. This makes all nodes on the invalid route appear infinitely distant, thereby preventing any of the routers from sending packets over the invalid route. When the path between two routers in a network goes bad, all the routers in the network are informed immediately. However, it is possible for this information to be lost, causing some routers to once again attempt to send packets over the bad route. This requires that they be informed again that the route is invalid, and again, this information can be lost. The resulting problem is known as a routing loop. Route poisoning is used in conjunction with holddowns. A holddown keeps update messages from falsely reinstating the validity of a bad route. This prevents routing loops, improving the overall efficiency of the network. ______________________ SELECTED LINKS: Sandip Patel and Digant Vakharia discuss routing protocols and the use of route poisoning. http://homepages.uel.ac.uk/u0222251/website/main_page.htm SearchNetworking.com offers a list of crash courses on networking-related topics. http://searchnetworking.techtarget.com/originalContent/0,289142,sid7_gci929528,00.html?track=NL-34 ______________________ TODAY'S TECH NEWS: IBM TO LURE EMC STORAGE CUSTOMERS IBM has launched an all-out attack on its biggest storage competitor by offering a new program that will give EMC users a simple way to migrate to IBM storage systems. http://searchstorage.techtarget.com/originalContent/0,289142,sid5_gci939569,00.html?track=NL-34 MIMAIL-L TAKES SLEAZY AIM AT ANTISPAM SITES Another variant of the Mimail worm has appeared that targets antispam sites. Mimail-L, however, implies some of the blacklist sites are selling child pornography, in addition to trying to steal sensitive user data and launching denial-of-service attacks against antispam sites. http://searchsecurity.techtarget.com/originalContent/0,289142,sid14_gci939570,00.html?track=NL-34 ONYX PULLS PIVOTAL OFFER Instead of trying to acquire its midmarket CRM rival, Onyx is now courting its customers. http://searchcrm.techtarget.com/originalContent/0,289142,sid11_gci939531,00.html?track=NL-34 >> Catch up on all the latest IT news at http://searchtechtarget.techtarget.com?track=NL-34 ______________________ SECRET WORD-OF-THE-DAY | What is IT? This computing and telecommunications industry specification describes a way for mobile phones, computers, and PDAs to interconnect with each other and with home and business phones and computers using a short-range wireless connection. >> See if you're right! http://searchmobilecomputing.techtarget.com/gDefinition/0,294236,sid40_gci211680,00.html?track=NL-34 _____________________ IT Horoscopes | December The stars are clear -- get your work caught up by mid-December and then you can join in the holiday fun. Find out exactly what the stars have in store for your sign this month! http://searchcio.techtarget.com/sDefinition/0,,sid19_gci919205,00.html?track=NL-34 _____________________ QUIZ | Presence Technology Instant messaging is making headway in the corporate world. Find out how much you know about presence technology in this week's quiz! http://searchdomino.techtarget.com/sDefinition/0,,sid4_gci934586,00.html?track=NL-34 _____________________ WORDS-TO-GO | Web Services This printable Words-to-Go glossary will give you a "quick handle" on what Web services is all about. http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci933806,00.html?track=NL-34 ______________________________ RECENT ADDITIONS AND UPDATES [1] sniglet http://whatis.techtarget.com/definition/0,,sid9_gci506044,00.html?track=NL-34 [2] skyscraper http://searchcrm.techtarget.com/sDefinition/0,,sid11_gci939086,00.html?track=NL-34 [3] hosted CRM http://searchcrm.techtarget.com/sDefinition/0,,sid11_gci939083,00.html?track=NL-34 [4] propagation delay http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci939061,00.html?track=NL-34 [5] TD-SCDMA http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci939058,00.html?track=NL-34 ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: MARGARET ROUSE, Site Editor ([EMAIL PROTECTED]) IVY WIGMORE, Consulting Editor ([EMAIL PROTECTED]) LOWELL THING, Consulting Editor and Founder ([EMAIL PROTECTED]) GABRIELLE DERUSSY, Advertising ([EMAIL PROTECTED]) ::::::::::::::::::::: ABOUT THIS NEWSLETTER :::::::::::::::::::::: This newsletter is published by TechTarget, the most targeted IT media. http://www.techtarget.com?track=NL-34 Copyright 2003 TechTarget. 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