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

[Paul Schmehl <pauls () utdallas edu>]

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
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by the 'Do More With Dual!' webinar
> happening
> July 14 at 8am PDT/11am EDT. We invite you to explore the latest in dual
> core and dual graphics technology at this free one hour event hosted by
> HP,
> AMD, and NVIDIA.  To register visit http://www.hp.com/go/dualwebinar
> _______________________________________________
> Snort-users mailing list
> Snort-users () lists sourceforge net
> Go to this URL to change user options or unsubscribe:
> https://lists.sourceforge.net/lists/listinfo/snort-users
> Snort-users list archive:
> http://www.geocrawler.com/redir-sf.php3?list=snort-users



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


-------------------------------------------------------
This SF.Net email is sponsored by the 'Do More With Dual!' webinar happening
July 14 at 8am PDT/11am EDT. We invite you to explore the latest in dual
core and dual graphics technology at this free one hour event hosted by HP,
AMD, and NVIDIA.  To register visit http://www.hp.com/go/dualwebinar
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users