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Re: Will this work - negated hosts?
From: "Weir, Jason" <jason.weir () nhrs org>
Date: Tue, 26 Oct 2010 11:06:24 -0400

-----Original Message-----
From: Crook, Parker [mailto:Parker_Crook () reyrey com] 
Sent: Tuesday, October 26, 2010 11:02 AM
To: Weir, Jason; snort-users () lists sourceforge net
Subject: RE: Will this work - negated hosts?


-----Original Message-----
From: Weir, Jason [mailto:jason.weir () nhrs org]
Sent: Tuesday, October 26, 2010 10:50 AM
To: snort-users () lists sourceforge net
Subject: [Snort-users] Will this work - negated hosts?

var HOME_NET [192.168.1.0/22,192.168.2.0/24]

var DNS_SERVERS [192.168.1.1,192.168.2.1]

var HOME_NET_MINUS_DNS [$HOME_NET,!$DNS_SERVERS]

And then use $HOME_NET_MINUS_DNS in a rule like this.

alert tcp [10.1.1.1,10.1.1.2,10.1.1.3] any -> 
$HOME_NET_MINUS_DNS any

-Jason

Jason, yes this will work... I have been using logical 
negations from IP ranges for quite some time successfully 
(page 26 of the 2.9 manual).

-Parker

Thanks Parker - wonder about 2.8.6.1 - off to RTFM thanks...

-J


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