North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: DDoS attacks
At 08:45 AM 7/12/01 -0700, Roeland Meyer wrote: >This is the main point, a script-kiddie hunt, with prosecution, is the ONLY >real deterrent. Throw some of them in hotel greybar and remove them from >computing, for life, and we may see some of this turn around. > >If a lady wears skimpy clothing, does she deserve to get raped? Obviously, >not. If a computer has skimpy protection, does it deserve to be turned into >a zombie? Simply because you forget to lock your car one night (whilst in >your driveway), do you deserve to have it stolen? If you leave a $100 on >your kitchen table, in your unlocked house, whilst you are working in your >garage, do I have the right to sneak in the back door and take it while >avoiding prosecution, on the grounds that you were careless? WRT EFFnet, >does a prostitute deserve to be raped? By the way, for those who care, there are relatively easy ways to fight DoS attacks: * use netflow and a bunch of scripts to detect them automatically * use BGP to block them on all your border routers instantly, based on destination * use BGP and Unicast RPF to block them on all your border routers instantly, based on source, if you really need to With a combination of all that, you can automatically block any major attack at your border. Is it scalable? Yes. What about false alarms? We have implemented the detection bit. With a bit of tuning, we get 0.1% of false alarms and yet catch an average of 15 attacks per day, above 500 pkts/s (up to 10000s pkts/s). I wouldnt be surprised if Tier1 networks would catch much more attacks than that, with the same tool. My point: block automatically 99% of the DoS attacks at the top 10 transit providers level, and we may see DoS attacks be a thing of the past. "Kiddies only do it because they can". DH. ___________________________________________________________________ * * David Harmelin Network Engineer * * DANCERT Representative * Francis House * 112 Hills Road Tel +44 1223 302992 * Cambridge CB2 1PQ Fax +44 1223 303005 D A N T E United Kingdom WWW http://www.dante.net ____________________________________________________________________
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