Snort mailing list archives
HOMENET IP exclusions
From: Nogwai <nogwai () gwaimo fr>
Date: Mon, 12 Mar 2012 18:07:47 +0100
Hi there, I am trying to exclude some IP/IP range from HOMENET variables. Basicly, I don't want to see any alerts coming from some single IP(s) and complete IP pools. So I've configured my HOMENET like this (in snort.ethX.conf) : var HOMENET [10.0.0.0/8,99.0.0.0/16,![10.9.0.0/16,99.0.17.0/24]] It appears that I have a lot of traffic coming from interface eth1. So I've managed to split the single snort process in three separate process running on interfaces eth1:1, eth1:2 and eth1:3 (with different rule-sets on each). And replicate the HOMENET variable in each snort.eth1:x.conf. Looking at snort process, HOMENET variable seems to be not taken from my snort.eth1:x.conf files but snort.debian.conf (I'm running Alienvault OpenSource SIEM - OSSIM v3.0, based on Debian 5.0.8 and Snort 2.9.0.4). So I've modified the DEBIAN_SNORT_HOME_NET to look like this : DEBIAN_SNORT_HOME_NET="10.0.0.0/8,99.0.0.0/16,![10.9.0.0/16,99.0.17.0/24]" And then, Snort don't want to restart : FATAL ERROR: /etc/snort/rules/emerging-dns.rules => Negated IP ranges that are equal to or are more-general than non-negated ranges are not allowed. Consider inverting the logic: $EXTERNAL_NET. Looking for some hints, I came across this ( http://seclists.org/snort/2010/q3/674), this ( http://seclists.org/snort/2009/q3/267) and read README.variables. But still lost. Don't know if the problem is Debian or Snort related... Actually, I play with CIDR to exclude the above IP inside the snort.debian.conf file. But this is a bit painful to maintain and I received some new exclusions to add to the list every week. I'll appreciate some light on this :) Greetings, Nogwai
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Current thread:
- HOMENET IP exclusions Nogwai (Mar 12)
- Re: HOMENET IP exclusions Jason Wallace (Mar 12)
- Re: HOMENET IP exclusions Nogwai (Mar 13)
- Re: HOMENET IP exclusions Heine Lysemose (Mar 13)
- Re: HOMENET IP exclusions Jason Wallace (Mar 13)
- Re: HOMENET IP exclusions Nogwai (Mar 13)
- Re: HOMENET IP exclusions Nogwai (Mar 13)
- Re: HOMENET IP exclusions Jason Wallace (Mar 12)