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1、TOPICSININTERNETTECHNOLOGYVirtualPrivateNetworks:AnOverviewwithPerformanceEvaluationShashankKhanvilkarandAshfaqKhokhar,UniversityofIllinoisatChicagoABSTRACTwidelyavailable,differingmainlyintermsofcostandcapabilities.Inrecentyears,however,openVirtualprivatenetworkshave
2、gainedsourceVPNsolutionshaveattractedalotofimmensepopularityamongcommercialandattentionfromresearchersanddevelopersalike.defenseorganizationsbecauseoftheircapabilityTheseareabreedofsoftwaresolutionsthatcantoprovidesecureconnectivityatlowercosts.providecommercial-grade
3、VPNservicesatcom-SeveralcommercialandopensourceVPNprod-modityprices,usingdesktopcomputersrunninguctsarenowavailablethatcanbeconfiguredtoLinux.TheavailabilityofsourcecodeandopenprovideVPNserviceswithvaryingcharacteris-sourcelicensingallowsdeveloperstocustomizeandoptimi
4、ze(andsometimescommercialize))'0.0749Tc0.024Tw(theseproductsforspecializedhardwareto)'0.0572Tc-0.0072Tw(extractmaximumperformance;forexample,)'0.0409Tc0.009Tw(SnapGear’s[2]LITE+andSME550products)'T*0.003Tc0.047Tw(useaportofFreeS/WAN(anopenIPSecimple-tics.Thisarticlest
5、udiessomeofthemostpopu-mentation)onlarOpen-SourceLinux-BasedVPNsolutions(OSLVs)andcomparesthemwithrespectto)'0.0596Tc-0.0096Tw(networkperformance(measuredintermsof)'T*0.015Tc0.035Tw(overhead,bandwidthutilization,andlatency/jit-ter),featuresandfunctionalities(e.g.,algo
6、rithmpluginsandrouting),andoperationalconcerns(definedbysecurityandscalability).Ourexperi)'20.870310TD0Tc(-mentssuggestthatthereisnosingleOSLVsolu-tionthatexcelsinallconsideredaspects,andaµClinux(Linuxformicrocon-combinationofdifferentVPNproductsand/ortrollers).SinceL
7、inuxisusedastheunderlyingtrade-offamongdesiredcharacteristicsmaybeoperatingsystem,deploymentisquickandeasy,requiredtodeliveroptimalperformance.Ourcircumventingtheneedforsystemadministra-experimentsalsosuggestthatonanaverage,torstolearnproprietaryoperatingsystems.AllOS
8、LVsusingUDP-basedtunnelshave50per-thiscoupledwithfreetechnicalsupport,avail-centloweroverhead,80percenthigherband-ablethroug
