Snort mailing list archives
Variable to specify 2 networks and exclude 1 host - How?
From: "Simon Yip" <simon388 () netvigator com>
Date: Thu, 14 Jul 2005 23:55:20 +0800
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 theflow 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 oneIP inside the network - How? HelloSuppose 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 theIP=155.200.2.10 Anyone knows the expression using the $HOME_NET and the above IP? Thanks Simon
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Current thread:
- Re: Snort-users digest, Vol 1 #5192 - 5 msgs Simon Yip (Jul 13)
- Re: Re: Snort-users digest, Vol 1 #5192 - 5 msgs Paul Schmehl (Jul 13)
- RE: Re: Snort-users digest, Vol 1 #5192 - 5 msgs Paul Melson (Jul 14)
- Re: Re: Snort-users digest, Vol 1 #5192 - 5 msgs Jason Brvenik (Jul 14)
- RE: Re: Snort-users digest, Vol 1 #5192 - 5 msgs Paul Melson (Jul 14)
- Variable to specify 2 networks and exclude 1 host - How? Simon Yip (Jul 14)
- Re: Variable to specify 2 networks and exclude 1 host - How? Matt Kettler (Jul 14)
- Re: Re: Snort-users digest, Vol 1 #5192 - 5 msgs Paul Schmehl (Jul 13)