Re: [Snort-users] Re: Snort-users digest, Vol 1 #5192 - 5 msgs

If you want to filter out one host, then you make the var:

var HOMENETFORRULE1234ONLY [x.x.x.x/32]

--On Thursday, July 14, 2005 02:51:13 +0800 Simon Yip 
<simon388@netvigator.com> wrote:

> Thanks PaulM.
>
> That could be a solution while I hope to have something like
> ![IP=155.200.2.10,!$HOME_NET]
> I have tried my above expression in a rule but it just give me a fatal
> error.
> where HOME_NET= [155.200.2.0/24,155.200.3.0/24]
>
> My purpose is to filter out a particular type of false positives alerts
> created by a host (its cron job generated the alert)
>  but I do not want to ignore all this type of alert.
>
> Simon
>
> > Message: 2
> > From: "Paul Melson" <pmelson@gmail.com>
> > To: "'Simon Yip'" <simon388@netvigator.com>,
> > <snort-users@lists.sourceforge.net>
> > Subject: RE: [Snort-users] snort variable to specify 2 networks and
> > exclude one IP inside the network - How?
> > Date: Mon, 11 Jul 2005 14:23:35 -0400
> >
> > What's the ultimate goal?  You have a rule that you want to fire if the
> > destination (or source) is $HOME_NET, except for the one host?
> >
> > One solution might be to create a custom variable in snort.conf, like:
> >
> > var HOMENETFORRULE1234ONLY
> > [155.200.2.4/30,155.200.2.8/32,155.200.2.9/32,\
> > 155.200.2.11/32,155.200.2.12/32,155.200.2.13/32,155.200.2.14/32,155.200.
> > 2.15 /32,\
> > 155.200.2.16/28,155.200.2.32/27,155.200.2.64/26,155.200.2.128/25,155.200
> > .3.0 /24]
> >
> > Then edit the rule(s) in question and replace $HOME_NET with
> > $HOMENETFORRULE1234ONLY.  There may be a better way of doing this within
> > the
> > flow syntax of an individual rule, but I'm not aware of how to do this.
> >
> > If all you want to do is ignore a specific alert for a specific host,
> > though, this is probably better handled through the software that is
> > responsible for analysis/alerting for your Snort instance.
> >
> > PaulM
> >
> >
> > ________________________________
> > Subject: [Snort-users] snort variable to specify 2 networks and exclude
> > one
> > IP inside the network - How?
> >
> >
> > Hello
> >
> > Suppose I have the variable HOME_NET= [155.200.2.0/24,155.200.3.0/24]
> > and  I
> > would like o specify in a rule to specify the host of HOME_NET exclude
> > the IP=155.200.2.10
> > Anyone knows the expression using the $HOME_NET and the above IP?  Thanks
> >
> > Simon
>
>
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Paul Schmehl (pauls@utdallas.edu)
Adjunct Information Security Officer
University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu/ir/security/


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