RE: HOME_NET and EXTERNAL_NET

[Paul Schmehl <pauls () utdallas edu>]

--On Wednesday, December 01, 2004 03:32:33 PM -0600 JAMIE CRAWFORD 
<crawford () cmsu1 cmsu edu> wrote:

> Thanks for the reply, but that will still show me attacks coming from my
> class b.  For some reason, I see alerts originating from and going to my
> class b, all I want to see is alerts about attacks made toward my two
> class c's, from anything but my class b. I know, a bit confusing.
Don't use a hammer for a screw.
var HOME_NET [192.168.1.0/24,192.168.2.0/24]
var EXTERNAL_NET !$HOME_NET
var CLASS_B 192.168.0.0/16

Then use a pass rule for any traffic from 192.168.0.0/16 to $HOME_NET.

pass ip $CLASS_B any -> $HOME_NET any (msg: ignore traffic from my class B 
to my HOME_NET; classtype:misc-activity; sid:1000001; rev:1;)

And start snort with the -o switch.

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


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