The BSD Packet Filter: A New Architecture for User ...

TheBSDP acketFilter:A NewArchitectureforUser-levelPacketCaptur e StevenMcCanne andVanJacobson LawrenceBerkeleyLaboratoryOneCyclotronRo adBerkeley, Thiscopyingcanbeminimizedbydeployinga kernelagentcalledapacketfilter, (BPF)usesa new, straightforwardbufferingstrategythatmake sitsoverallperformanceupto100timesfaster thanSun s s Unixusersdependonhavingreliable, , thisdependencemeansthatnetworktroublecan makeit impossibletogetusefulworkdoneandincreasi nglyusersandsystemadministratorsfindthat a ,ideally, thesetoolsshouldbeavailablewheretheprobl emsare allowsuchtoolstobeconstructed,a kernelmustcontainsomefacilitythatgivesus er-levelprogramsaccesstoraw,unprocessedn etworktraffic.[7] Mostoftoday s workstationoperatingsystemscontainsucha facility, ,NIT[10] in Thisisa preprintofa papertobepresentedatthe1993 WinterUSENIX conference,January25 29,1993,SanDiego,CA. ThisworkwassupportedbytheDirector, OfficeofEnergyResearch,ScientificComputi ngStaff, ,theUltrixPacketFilter[2] in DEC s UltrixandSnoopinSGI s adapttheXeroxAlto packetfilter to aUnixkernel[8].

The BSD Packet Filter: A New Architecture for User-levelPacket Capture Steven McCanne and Van Jacobson Lawrence Berkeley Laboratory One Cyclotron Road

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