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(LHC!Bi!4@B !HC!Bi!4@B !HC!Bi!4@B !HC!Bi!4@B !HC!Bi!41 !EQbs!}j7<I-L !HC!Bi!4V!3+ ABi!4@B C N1qHC!Bi!4@B !HC!Bi!4Ptx<]C!Bi!4@B !HC!Bi!4@B !H$15dȐx`F6l([VeذaII|=dԨQ!t8Æ Ȉ n wC :@Ⱥ_s]we{;yȑ#n; ;>|mmmyyy.Kv_@C3!4@B !HC!Bi!4@B !2mbX@ߨce=4!'ks8x&(ox<O##1a.F08?i@_N,-|`-1F@9`jNnM@"~_LĀhh9أFj\_X̓Hqc{yGf&%|Zkc6Sto?+ _3"N9'tӌ4n@L$Xf yyk:~r%\W-<308M9ڠPG >$Rz-Me~Y5`mJNǂ}n_pXYӯR/fԿ?Lz/;i\l2 CT86DKH V !@r Bi˪qO b̄zgq@{-*.*F!3{(߹ F%mjmp%}KQ'g8{2du*t6ݕBb8@:NjۅIENDB`DrXXgg JHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPg%JoeM$mVTDrML8DrMD,DrOb~SVDrdc]SDUDQ !  Home~LT~TiteldxV4B1ZWhat are the popular defenses? Home~LT~Titel<( (@'+'DrObSVDrW a*Ic]SDUDQ (Home~LT~Gliederung 1W a*IxV4B1Z(Block bogon, invalid and attack packets.Home~LT~Gliederung 1g* <( (@'#((0Monitor traffic thresholds, patterns and trends.Home~LT~Gliederung 1g* <( (@'#004Rate limit traffic to help prevent oversubscription.Home~LT~Gliederung 1g* <( (@'#44+Prevent end hosts from becoming DoS agents.Home~LT~Gliederung 1g* <( (@'#++!Black hole victim hosts/networks.Home~LT~Gliederung 1g* <( (@'#!!2Maintain good incident response and support staff.Home~LT~Gliederung 1g* <( (@'#22Home~LT~Gliederung 1g* <( (@'#2As you might guess, no one defense solves it all.*Home~LT~Gliederung 1g* <( (@'#22DrXXgg NHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0 DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPgoJoeM$mVTDrML8DrMD,DrObSVDrW aYc]SDUDQ !  Home~LT~TitelW aYxV4B1Z In depth look at packet blocking Home~LT~Titel<( (@'+'    DrOb SVDrW :aXIc]SDUDQ (Home~LT~Gliederung 1EW :aXI&xV4B1 Z]Blocking invalid/bogon packets from reaching the net is generally considered a best practice.Home~LT~Gliederung 1g* <( (@'#]]RHowever, it may severely impact forwarding performance and be difficult to manage.Home~LT~Gliederung 1g* <( (@'#RR\Blocking on general attack characteristics may also block and break legitimate applications.Home~LT~Gliederung 1g* <( (@'#\\Home~LT~Gliederung 1g* <( (@'#cMany ISPs mitigated the recent Slammer/Sapphire worm by temporarily blocking UDP port 1434 traffic.Home~LT~Gliederung 1g* <( (@'$ccDrXXgg NHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0 DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPg1JoeM$mVTDrML8DrMD,DrObiSVDrW a@c]SDUDQ !  Home~LT~TitelW a@xV4B1wZ Traceback Home~LT~Titel<( (@'+'    DrObSVDrW )aWIc]SDUDQ (Home~LT~Gliederung 1W )aWIxV4B1ZOEnabled routers generate or encode trace information to the traced destination.Home~LT~Gliederung 1g* <( (@'#OOXVictims can use trace information to discover the real path back to the original source.Home~LT~Gliederung 1g* <( (@'#XX6Authentication, deployment and practical issues exist.Home~LT~Gliederung 1g* <( (@'#66DrXXgg NHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0 DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPg JoeM$mVTDrML8DrMD,DrOb|SVDrW a@c]SDUDQ !  Home~LT~TitelW a@xV4B1ZSource path isolation engine Home~LT~Titel<( (@'+'DrObASVDrW )aWIc]SDUDQ (Home~LT~Gliederung 1|W )aWI]xV4B1BZKRouters keep a hash of all packets passing through and send to a collector.Home~LT~Gliederung 1g* <( (@'#KKGTo trace a packet, query the collector based on packet characteristics.Home~LT~Gliederung 1g* <( (@'#GG+SPIE can potentially trace a single packet.Home~LT~Gliederung 1g* <( (@'#++*Significant scaling and deployment issues.Home~LT~Gliederung 1g* <( (@'#**DrXXgg NHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPgOJoeM$mVTDrML8DrMD,DrObhSVDrs !cc]SDUDQ !  Home~LT~Titels !cxV4B1vZPushback Home~LT~Titel<( (@'+'DrObSVDr ya,Jc]SDUDQ (Home~LT~Gliederung 1= ya,JxV4B1ZSA mechanism to signal downstream routers to aggressively drop/limit attack traffic.Home~LT~Gliederung 1g* <( (@'#SSYRouters must detect attack traffic. A similar problem shared by signature based filters.Home~LT~Gliederung 1g* <( (@'#YYEIf attack traffic is widely distributed, pushback may be ineffective.Home~LT~Gliederung 1g* <( (@'#EEHome~LT~Gliederung 1g* <( (@'#cIMHO, pushback and related techniques are the most interesting and elegant network-based solutions.Home~LT~Gliederung 1g* <( (@'&ccDrXXgg NHome~LT~GliederungDrPgmJoeMVT$mDrML8DrMD,DrOb<SVDr&5 B0DrObPSVDr 3CG]c]SDUDQ #Home~LT~Notizen 3CG]qxV4B1\ZClick to add notesHome~LT~Notizen<( (@''DrXXgg JHome~LT~GliederungDrPgW,WJoeM$mVTDrML8DrMD,DrObSVDrs !cc]SDUDQ !  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