Re: Snort home net and external net question

["Andy Berryman" <aberryman () Cymtec com>]

I tried that, but am getting an error. I'm running 2.8.6.0

 

Sep  3 16:51:33 (none) snort[18415]: FATAL ERROR:
/snort/conf/general.rules(1) Negated IP ranges that are equal to or are
more general than non-negated ranges are not allowed.  Consider
inverting the logic: $EXTERNAL_NET.

 

var HOME_NET [10.215.0.0/16]

var EXTERNAL_NET [10.215.40.0/24,!$HOME_NET]

 

Is it b/c my home net is a /16 and the external net I'm trying to add is
a /24? 

 

 

Thanks,

Andy 

 

 

From: Joel Esler [mailto:jesler () sourcefire com] 
Sent: Friday, September 03, 2010 11:53 AM
To: Andy Berryman
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Snort home net and external net question

 

On Sep 3, 2010, at 11:01 AM, Andy Berryman wrote:





If I have my home net of snort set to:

 

var HOME_NET [10.215.0.0/16]

 

How can I make my external net be !$HOME_NET and 10.215.40.0/24 subnet?

 

 

With recent versions of Snort, you can do positives and negatives in the
same variable, but the more specific entry needs to come first.

 

var HOME_NET [10.215.0.0/16]

var EXTERNAL_NET [10.216.40.0/16,!$HOME_NET]

 

Should work.

 

Joel

 


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