[Oisf-users] Can I block DDos attack via Suricata-IDS?

Peter Manev petermanev at gmail.com
Sun Feb 5 09:44:07 UTC 2017

> On 4 Feb 2017, at 19:12, Cooper F. Nelson <cnelson at ucsd.edu> wrote:
>> On 2/3/2017 7:03 AM, Peter Manev wrote:
>>> On Wed, Feb 1, 2017 at 11:28 PM, Cooper F. Nelson <cnelson at ucsd.edu> wrote:
>>> I was using the automatic feature in the .yaml.  I just explicitly
>>> defined it in the rules as well.
>> Do you see any diff/improvement that way?
> I'm measuring performance as % packet drops over 24hs.  Did not see any
> clear difference.
>>> Btw, I posted about this earlier, but I'm basically doing a 'prefilter'
>>> for doing file extraction by magic number by building a custom magic.mgc
>>> file.  If you only build in the magic numbers you are interested in
>>> matching on it vastly improves performance (when using the filemagic
>>> keyword).
>> Yes that is a cool trick. Did you see perf hit across the whole system
>> or just a subset of CPU(s)?
> Whole system.  Suri is using one filemagic thread per detect thread.
> Matching magic numbers with hyperscan would be way better, but that's a
> tall order I think!

Would be a good FR discussion on redmine :)

> -- 
> Cooper Nelson
> Network Security Analyst
> UCSD ITS Security Team
> cnelson at ucsd.edu x41042

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