I was looking into using this mechanism for blocking DDoS on Juniper devices, but at the time, they only supported 8k flowspec entries/routes and this was not sufficient to deal with the problem. My fallback was to poison the routing table with null routes, but the problem with this was that it didn't address inbound traffic, only the replies. We ended up ditching all of this in favor of a third party external scubbing vendor. They tend to prefer big honking boxes running signatures whereever possible to drop identified malicious traffic. When you get right down to it, the vendors have a lot of experience day-to-day performing mitigations, and flowspec (or other BGP mitigations) are more useful to carriers and ISPs to null out the destination rather than the source. Pierre On 29/04/2016 9:08 AM, dennis wrote:

Hi Amplification attacks and syn floods are just touching the surface of ddos attack vectors. You should look into some industry reports: Here are a couple examples to get you started. https://www.radware.com/ert-report-2015/ http://www.verizonenterprise.com/verizon-insights-lab/dbir/2016/

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-------- Original message -------- From: Martin Bacher <ti14m028@technikum-wien.at> Date: 4/29/2016 2:02 AM (GMT-08:00) To: Tyler Haske <tyler.haske@gmail.com> Cc: NANOG list <nanog@nanog.org> Subject: Re: BGP FlowSpec

Hello Tyler,

thanks for your reply.

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Am 28.04.2016 um 17:37 schrieb Tyler Haske <tyler.haske@gmail.com>:

Martin,

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Last but not least: I am also looking for anonymized statistical data about DDoS attacks which I could use in the thesis. I am mainly interested in data about the type of attacks, attack time, sources, source and destination ports, and so on. I know this something which is generally not shared, so I would really appreciate it if someone would be able to share such data.

Many companies are extremely reluctant to share their attack data. But that's OK, because there are other ways to get it.

Have you investigated backscatter analysis? It's used to see ongoing and current Internet scope DDoS attacks. I just had a look on that and thought that its only be able to detect some of the attacks. You might not detect large state of the art reflection and amplification attacks with that method. But i think it is useful for some sort of attacks like SYN flood. Do you agree?

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Inferring Internet Denial of Service Activity https://cseweb.ucsd.edu/~savage/papers/UsenixSec01.pdf

Analyzing Large DDoS Attacks Using Multiple Data Sources https://www.cs.utah.edu/~kobus/docs/ddos.lsad.pdf

ISP Security - Real World Techniques https://www.nanog.org/meetings/nanog23/presentations/greene.ppt

A Summary of DoS/DDoS Prevention, Monitoring and Mitigation Techniques in a Service Provider Environment https://www.sans.org/reading-room/whitepapers/intrusion/summary-dos-ddos-pre...

Maybe you have access to some public IPs, then you can do this data collection yourself.

Sure, I will definitely think about hat.

Thanks again for your reply and for providing the links.

Greetings, Martin

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Regards,

Tyler