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| Subject: | [Snort-sigs] Basic question [] syntax question about excluding a subnet of a larger subnet... |
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| Date: | Thu, 16 Mar 2006 15:38:16 -0500 |
Question... What is the correct way to exclude a subnet from a larger network in a signature? var NET1 10.0.0.0/8 var NET2 10.7.0.0/16 var NET3 10.14.0.0/16 alert tcp [$NET1,!$NET2] ANY -> $NET3 ANY ...blah, blah, blah... Is that the right way to watch for something from NET1 but not in NET2 going to NET3??? I've seen sigs that do ![$NET2,$NET3] before but I have never seen one where the ! was in the []. I could not find any examples of using a ! in [] so I'm not sure if this syntax is correct. If it is not correct in a sig then is it correct in a var??? var NET1 10.0.0.0/8 var NET2 10.7.0.0/16 var NET3 10.14.0.0/16 var NOTNET2 [$NET1,!$NET2] then... alert tcp $NOTNET2 ANY -> $NET3 ANY ...blah, blah, blah... Thx, Wally
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