[Snort-users] Frag3 target default setting

Joel Esler (jesler) jesler at ...589...
Sat Feb 28 16:30:46 EST 2015


Yes, you should.


> On Feb 28, 2015, at 4:18 PM, Research <research at ...17107...> wrote:
> 
> Hi,
> 
> I have noticed that in the default snort.conf file that ships with Snort 2.9.7.0, the frag3 preprocessor’s setting for “policy” is “windows:
> 
> 	preprocessor frag3_engine: policy windows detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180
> 
> Based on the latest Snort manual, I note the following about target based assembly:
> 
> 	"The basic idea behind target-based IDS is that we tell the IDS information about hosts on the network so that it can 
> 	avoid Ptacek & Newsham style evasion attacks based on information about how an individual target IP stack operates.”
> 
> In my case, I am using Snort in passive mode on a web server based on Linux.  The target that I am protecting is not a network,
> but a single Linux host.
> 
> In this case, should I not change the policy to linux, as in:
> 
> 	preprocessor frag3_engine: policy linux detect_anomalies overlap_limit 10 min_fragment_length 100 timeout 180
> 
> …or am I a) incorrect or b) the differences are minimal ?
> 
> Thanks
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