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1、OverlayNetworkstoSupportInternetEmergencyPreparednessServicesJianGao,CoryBeardSchoolofComputingandEngineering,UniversityofMissouri–KansasCity,KansasCity,MO64110USA.Abstract–Today’sbest-effortInternetisnotabletoprovidetheassmallerpacketlossrateanddelay,buthaven
2、otnecessarilyvariety,quality,anddependabilityofservicesrequiredbyexpectedguaranteedquantifiableperformanceguarantees.Internetemergencypreparedness(Ieprep)users.ThisisduetoOverlaynetworksmightnotbeabletoprovideguarantees,thecurrentInternetinfrastructure,address
3、ingscheme,routingbutcertainlycouldprovideimprovedserviceforemergencies.algorithms,andotherhistoricalreasons.Recently,variousWedonotneedtowaitforISP’stodeploynewformsofoverlaynetworkshavebeenbuiltontopofoneorfunctionalities,orwaitforexpensiveISPcontract.Inaddit
4、ion,severalexistingnetworkarchitecturestoimplementnewfeaturesandfunctionalitiesthatcomplementorcircumventISP’susuallyoptimizetheirnetworkperformancebasedonperformanceprovidedbyadefaultnetwork.Thispaperexpectationsofnormalconditions,suchasregularnetworkoutlines
5、andevaluatesthepracticalwaytobuildanoverlaycongestionoccurringonthebottlenecklink,insteadofnetworkforconsiderationofIeprepandmakeitefficientlyconsideringdisastersintheirplanning.OverlaynodescanbedeliveremergencyservicetrafficovertheInternet.distributedacrossth
6、ewholeInternet,tocoverasmuchareaaspossibletocircumventnetworkfailurescausedbythoseKeywords–overlay,emergencyserviceunpredictableevents.AnoverlaylinkisavirtualoneandmayconsistofmanyI.INTRODUCTIONactuallinksintheunderlyingnetwork.Anoverlaynode(ON)actsasarouter,f
7、orwardingpacketstothenextoverlaylinkEmergencytrafficisgeneratedtofulfillcommunicationtowardsthedestinationnode.Considerthediagrambelow:needsofspecialusersduringseriousdisastersandemergencyevents,suchasearthquakeandterroristattacks,sothattheycanreturnthepopulat
8、iontonormallivingconditions[1].Todaytheseemergencycommunications,suchasaccessinginformation,coordinatingefforts,listingsurvivorsorvictims,andexchangingpicturesorvideosofthescene,ar
