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Network Security Snort-Signatures
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Re: [Snort-sigs] what triggers spp_stream4: TTL Evasion attempt

from [Nigel Houghton] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] what triggers spp_stream4: TTL Evasion attempt
Date: Thu, 18 Nov 2004 14:43:28 -0600 
On  0, Russell Fulton <r.fulton@auckland.ac.nz> allegedly wrote:

Hi Folks,
      I'll try this one again, I posted this query a few weeks ago to the
support list without receiving a responses.

The subject really says it all, just what triggers this alert from the
plugin?


 http://www.snort.org/snort-db/sid.html?sid=111:15


I have recently installed snort on the inside of our campus network and
have noticed that traffic from our dial in pool often trigger this alert
and I am puzzled as to why.


Weird TTL values.

+-----------------------------------------------------------------+
    Nigel Houghton      Research Engineer       Sourcefire Inc.
                  Vulnerability Research Team

 You know, I rather like this God fellow. Very theatrical, 
 you know. Pestilence here, a plague there. Omnipotence 
 ...gotta get me some of that. - Stewart Griffin


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