RE: snort variable to specify 2 networks and exclude one IP inside the network - How?

["Paul Melson" <pmelson () gmail com>]

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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