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DDoS In the Real World Do DDoS attacks really happen?

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Presentation on theme: "DDoS In the Real World Do DDoS attacks really happen?"— Presentation transcript:

1 Prolog to Lecture 18 CS 236 On-Line MS Program Networks and Systems Security Peter Reiher

2 DDoS In the Real World Do DDoS attacks really happen?
What responses are taken in real cases? What tools are available and used today to handle DDoS?

3 Real World Occurrence of DDoS
Estonia, Georgia, Iran, Australia governments have all suffered large DDoS attacks in recent years Companies also get attacked fairly often Usually for extortion Sony recently attacked as part of larger attack It’s pretty common

4 So What Do Victims Do? Generally, either last it out
Or pay extortion, if that’s the goal of the attacker Or enlist help from ISP Who may, in turn, enlist help of other parties

5 How Do ISPs Help? Two approaches: Drop traffic
Block attacking machines

6 Dropping Traffic Drop traffic before it gets to the victim
Which traffic? Usually, ISP engineers examine data flows by hand Dropping obvious attack flows Or all traffic from obvious attack sources May need to get upstream ISPs to help Generally a blunt instrument And not quick

7 Blocking the Bots Can’t just block them near the target
Must get them further upstream Generally at their entry to the Internet Requires cooperation of their providers Won’t do it for just anyone A lot of work, if there are lots of bots

8 Content Distribution Network Approaches
Akamai and similar companies can help their customers They maintain cached copies of customer content And have huge server pools spread around the Internet How does that help?

9 The Resource Multiplication Solution
Cache content at vast number of places As demand increases, increase caching Few attackers can overwhelm big enough cache providers Who could charge for the protection A feasible solution, but not cheap

10 Do Practical Measures Work?
If you can get the necessary parties to help, usually yes What’s theoretically hard might not be too bad, in practice If you are important enough Small fry are likely to get squashed


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