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Re: snort DCE/RPC reassemble_threshold
From: Ryan Jordan <ryan.jordan () sourcefire com>
Date: Tue, 21 Dec 2010 12:14:32 -0500

Hi Larry,

The README.dcerpc that you linked was tied to the old dcerpc
preprocessor, which we removed in Snort 2.9.0. We replaced it with
dcerpc2 a couple years ago, whose README you can find here:
http://cvs.snort.org/viewcvs.cgi/snort/doc/README.dcerpc2

From the README:
    reassemble_threshold
        Specifies a minimum number of bytes in the DCE/RPC desegmentation and
        defragmentation buffers before creating a reassembly packet to send to
        the detection engine. This option is useful in inline mode so as to
        potentially catch an exploit early before full defragmentation is done.
        A value of 0 supplied as an argument to this option will, in effect,
        disable this option.  Default is disabled.

-Ryan

On Tue, Dec 21, 2010 at 12:04 PM, Lawrence R. Hughes, Sr.
<lhughes () safemedia com> wrote:
Hi,

The default snort.conf file has:

preprocessor dcerpc2:  reassemble_threshold

yet when looking at the snort manul reassemble_threshold is never mentioned
also the README.dcerpc  does not mention it.

What is it and what does it do?

Thanks,
Larry

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------------------------------------------------------------------------------
Forrester recently released a report on the Return on Investment (ROI) of
Google Apps. They found a 300% ROI, 38%-56% cost savings, and break-even
within 7 months.  Over 3 million businesses have gone Google with Google Apps:
an online email calendar, and document program that's accessible from your 
browser. Read the Forrester report: http://p.sf.net/sfu/googleapps-sfnew
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