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1、華中科技大學(xué)碩士學(xué)位論文ModelingDesignAnalysisofFirewallSwitchfHighSpeedwks姓名:DerejeYohannes申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師:徐正權(quán)20040512IIAbstractFirewallsareoneofthemostcommonlyusedsecuritysystemstoprotectwkshosts.Becausefirewallsofferavari
2、etyoffeaturesservicesitisclearthattheimplementationofthesystemdependsonitsunderlyingwkingtechnologies.Amongthedifferentfirewallarchitecturesarouterbasedpacketfilteringfirewallisthemostcommoneffectivewayofprotectinganente
3、rprisewkfromunauthizedaccess.HoweveritwillnotwkefficientlyinanATMwkbecauseitrequirestheterminationofendtoendATMconnectionsatapacketfilteringrouterwhichproducesahugeoverheadofSAR(SegmentationReassembly).Veryfewapproachest
4、othisproblemhavebeenproposedinpreviousyearsDifferentfromthisapproachthisresearchfocusesonstudyingthelimitationsoftheexistingfirewallswitchesproposessolutionsfthedrawbacks.RecentlyATLASotherATMFirewallswitchesareusedtopro
5、tecthighspeedATMwksfromIntrudersbuttheswitcheshavethefollowinglimitationstheyperfmpacketlevelfilteringatonlyOC3ctoavoidSARfeachpackettheyonlychecksthefirstcell.Passfail!theyuseapolicycachearchitecturetospeedthefilteringo
6、perationup.Ceunitispolicycache(CAM)ifhitcachethepacket’scellsarefwarded.OtherwisethefirstcellgothroughasoftwarescreeningprocessothercellsarebufferedinaqueuethisresultsunwanteddelayinfilteringtheswitchdoesnotacceptIPpacke
7、tswithIPoptionfieldsingeneraltheyarenotfriendlyfmanagementadministration.HereinthisdissertationweproposeanewATMfirewallarchitecturethatsolvesthestatedlimitationsothersecuritypatcheswith2.88Gbitessecthroughputabetterwking
8、perfmance.Thedissertationaddressesthesearchfmechanismsthatcanprovidefirewallsecurityservicesfhighspeedwkingtechnologies.WedescribeanarchitectureprovidingahighspeedaccesscontrolservicefirewallfATMIPoverATMwks.Mostofthealt
9、ernativestoourproposalfocusontheefficiencyoftheaccesscontrolprocessaccdingtothefirewallmodelwedepicted.MeoverourproposalgivesthesecurityofficertheabilitytofilterATMtrafficsthroughaccesscontrolparameterssuchasQoS(Qualityo
10、fService).IngeneralthedissertationexplicitlydescribesthemodelingdesignanalysisofthefirewallswitchthatweproposetosolvefixthelimitationsoftheexistingpacketlevelfilteringATLASATMfirewallswitches.Ourwkalsoprovidesaframewkint
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