Snort mailing list archives
Re: Snort 2.9.6.2 inline mode problem
From: Y M <snort () outlook com>
Date: Sun, 24 Aug 2014 05:34:03 +0000
inline. Date: Sun, 24 Aug 2014 05:02:13 +0200 From: demonsdebason () gmail com To: snort-users () lists sourceforge net Subject: [Snort-users] Snort 2.9.6.2 inline mode problem Hi all. I've been working on my Snort IPS for some time now. Noticed that 'drop' rules are working half-way, I have set the test rule to drop ICMP coming to the sensor from local machine: drop icmp 192.168.1.2 any -> 192.168.1.1 any (msg: "Test rule"; sid:110011;) Alerts get logged and can view them via BASE, but when I ping from .2 to .1 I get this: PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. 64 bytes from 192.168.1.1 : icmp_seq=1 ttl=64 time=0.216 ms
From 192.168.1.1 icmp_seq=1 Destination Port Unreachable
64 bytes from 192.168.1.1 : icmp_seq=2 ttl=64 time=0.269 ms
From 192.168.1.1 icmp_seq=2 Destination Port Unreachable
64 bytes from 192.168.1.1 : icmp_seq=3 ttl=64 time=0.221 ms So some of them are getting 'blocked'. When I shutdown Snort I's all fine: 64 bytes from 192.168.1.1 : icmp_seq=8 ttl=64 time=0.226 ms 64 bytes from 192.168.1.1 : icmp_seq=9 ttl=64 time=0.201 ms 64 bytes from 192.168.1.1 : icmp_seq=10 ttl=64 time=0.253 ms 64 bytes from 192.168.1.1 : icmp_seq=11 ttl=64 time=0.204 ms Here is my info: ,,_ -*> Snort! <*- o" )~ Version 2.9.6.2 GRE (Build 77) '''' By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team Copyright (C) 2014 Cisco and/or its affiliates. All rights reserved. Copyright (C) 1998-2013 Sourcefire, Inc., et al. Using libpcap version 1.4.0 Using PCRE version: 7.8 2008-09-05 Using ZLIB version: 1.2.3 +++++++++++++++++++++++++++ snort 41104 4.6 2.0 1675528 1342832 ? Ssl 04:48 0:00 /usr/sbin/snort -D -i eth1::eth2 -u snort -g snort -c /etc/snort/snort.conf -Q --daq-mode inline -k none +++++++++++++++++++++++++++ # Looks like you have double colons "eth1::eth2", as opposed to one colon "eth1:eth2". Not sure if the double colons are causing the partial drops. snort --daq-list Available DAQ modules: pcap(v3): readback live multi unpriv ipfw(v3): live inline multi unpriv dump(v2): readback live inline multi unpriv afpacket(v5): live inline multi unpriv ++++++++++++++++++++++++++ snort.conf: config policy_mode:inline config daq: afpacket config daq_dir: /usr/lib64/daq config daq_mode: inline config daq_var: buffer_size_mb=1024 I've tried dropping all the ICMPs in the iptables, results are as expected, but Snort still logs the alerts. Do you have any idea what is the issue here? # Does Snort log the requests or replies or both? I would image if the NIC is promiscuous, then it would still see the requests. -- Aut viam inveniam aut faciam :wq! ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
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Current thread:
- Snort 2.9.6.2 inline mode problem Debason Shockre (Aug 23)
- Re: Snort 2.9.6.2 inline mode problem Y M (Aug 23)
- Message not available
- Re: Snort 2.9.6.2 inline mode problem Y M (Aug 24)
- Re: Snort 2.9.6.2 inline mode problem Debason Shockre (Aug 24)
- Re: Snort 2.9.6.2 inline mode problem Y M (Aug 24)
- Re: Snort 2.9.6.2 inline mode problem Debason Shockre (Aug 24)
- Re: Snort 2.9.6.2 inline mode problem Y M (Aug 25)
- Re: Snort 2.9.6.2 inline mode problem James Lay (Aug 27)
- Re: Snort 2.9.6.2 inline mode problem Debason Shockre (Aug 27)
- Re: Snort 2.9.6.2 inline mode problem James Lay (Aug 27)
- Re: Snort 2.9.6.2 inline mode problem Debason Shockre (Aug 27)
- Re: Snort 2.9.6.2 inline mode problem James Lay (Aug 27)
- Message not available
- Re: Snort 2.9.6.2 inline mode problem Y M (Aug 23)