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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