Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008

working group, in order to initiate discussionon the choice of the transport protocol.ConclusionThe project will finish at the end of 2008, andwe cover several IEEE 802.21 issues. Thestudy of Layer 2 handover in different accesstechnologies (IEEE 802.11, 802.16) and theusage of MIH functions allow to performefficient and seamless handover. In order totransport the MIH messages, which mayinclude decision policies, we study availabletransport protocols. SCTP seems to be a goodcandidate in terms of security, reliability,multihoming and mobility support.References[1] Richard Rouil, IEEE 802.16implementation in NS-2,http://w3.antd.nist.gov/[2] Richard Rouil, Nada Golmie, AdaptiveChannel Scanning for IEEE 802.16e, MilitaryCommunications Conference (MILCOM 2006),Oct. 2006, Washington, DC[3] Nicolas Montavont, Badii Jouaber, andRichard Rouil. “Gemoth technical report”,https://labo4g.enstb.fr/twiki/pub/Labo4G/ProjetsGemoth/gemoth-technical-report.pdf.Mobility and Multihoming: interaction and benefitsResearch Staff : Nicolas Montavont – Ph.D. Student: Amine DhraiefKeywords : heterogeneous access networks, IPv6, multihoming, mobile IPv6Applications : ITS, transportationPartners & Funding : Region BretagneIntroductionA new digital but especially wireless world isknocking at the door. Wireless technologiesoffer now high performance and allow to getrid of cable. However, there is no singlecommunication technology that can puttogether all users needs, such as widecoverage areas, high data rate and support formobility. Instead, terminals integrate severalmeans of communication, which allow takingadvantage of each independent technology.This results in multihomed terminals that canaccess network resources through differentroutes. Multihoming is an important featurethat allows to distribute communication flowsover a set of paths (or interfaces), or torecover upon failure. However, while IPv6offers a framework for multihoming, standardsystems do not take as many benefits asmultihoming can offer.This project is tackling this problem byenabling a full multihoming support, especiallyin a mobile context. The typical scenario that isconsidered is a mobile network, which canaccess the Internet via different paths anddistribute its traffic according to a set ofpreferences. Location management, failurediscovery or flow redirection are some of theissues this project is focusing on.This work is conducted in the framework of theMoshi PhD project (MObility and SHIm) fundedby région Bretagne. It began in September2006.Prefix delegation2001:660:7301:3728/642001:660:220:101/64ISP1Address 1 = 2001:660:7301:3728:250:daff:fede:f7b4Address 2 = 2001:660:220:101:250:daff:fede:f7b4Address 3 = 2001:660:220:102:250:daff:fede:f7b4RealizationInternetISP2Prefix delegation2001:660:220:102/64IPv6 prefix Interface identifierDuring the first year of the project, we studiedthe bibliography and evaluated severalprotocols (SHIM6, HIP, SCTP). This evaluationmade us choose SHIM6 as the basic protocolfor the remaining work. SHIM6 was chosenPracom’s Annual Report 2008 27