Re: ru.le to detect lots of syn pkts?

[Paul Schmehl <pauls () utdallas edu>]

--On Friday, June 04, 2004 11:36:54 AM -0600 Rich Adamson 
<radamson () routers com> wrote:

> > > Of course.  That's what thresholding is for.  For example:
> > >
> > > If you only want to catch SYN packets:
> > > alert tcp $HOME)NET any -> any any (msg: "High traffic host, SYN
> > > packets";  flags:S; threshold: type both, track by_src, count 4000,
> > > seconds 60;  classtype:misc-activity; sid: 1000002; rev:1;)
>
> Getting  and error "*** Invalid integer input: 4000" using the above.
> Running v2.10. Do I need to upgrade to handle this?
No, something else is wrong.  Thresholding has been in snort since about 
2.0.4 (IIRC).  It may be a syntax problem.  Make sure that you have a colon 
after threshold and commas after each keyword, and a semi-colon at the end.

threshold: type both, track by_src, count 4000, seconds 60;

Paul Schmehl (pauls () utdallas edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu/ir/security/


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