Variable to specify 2 networks and exclude 1 host - How?

["Simon Yip" <simon388 () netvigator com>]

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


> > 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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