Snort mailing list archives
Re: Problem running Snort Inline
From: Anshuman Anil Deshmukh <anshuman () cybage com>
Date: Fri, 6 Feb 2015 06:36:28 +0000
Hi James, Thanks for your reply. Even with the command snort --daq afpacket --daq-mode inline -i eth0:eth1 result is same. I already tried different options like providing the options from the command line as well as configuring the same in the snort conf file. But same result with that. What else could be reason? Just for your information initially snort 2.9.6.1 was installed with the Autosnort script. Later on it was upgraded to version 2.9.7.0. is there anything to do with the daq configuration after snort upgrade? Regards, Anshuman From: James Lay [mailto:jlay () slave-tothe-box net] Sent: Thursday, February 5, 2015 7:12 PM To: snort-users () lists sourceforge net Subject: Re: [Snort-users] Problem running Snort Inline On Thu, 2015-02-05 at 06:40 +0000, Anshuman Anil Deshmukh wrote: Hi, We have issues running Snort inline. This is the exact problem which is mentioned here - http://www.linuxforums.org/forum/debian-linux/200751-snort-inline.html (see log below). We have setup the Snort inline (version 2.9.7.0) which is compiled using switch --enable-sourcefire. It says “Enabling inline operation” and then switches to IDS mode. Our command line for running Snort: /usr/local/snort/bin/snort -c /usr/local/snort/etc/snort_conf_rules.conf -i eth0:eth1 -Q --pid-path=/var/run which creates the bridge automatically. Both the interfaces doesn’t have IP addresses assigned. We have already enabled following options for snort inline: config policy_mode:inline config daq: afpacket config daq_mode: inline config daq_var: buffer_size_mb=1024 preprocessor normalize_ip4 preprocessor normalize_tcp: ips ecn stream preprocessor normalize_icmp4 preprocessor normalize_ip6 preprocessor normalize_icmp6 Under verdicts it shows 0% packets blocked. We have enabled couple of drop rules for BRUTE FORCE attack one of which is getting detected. Here is the snort output. 02/02-12:12:23.042082 [Drop] [**] [1:2019876:2] ET SCAN SSH BruteForce Tool with fake PUTTY version [**] [Classification: Detection of a Network Scan] [Priority: 3] {TCP} 000.000.000.00:38772 -> 00.00.00.:22 (IP addresses information removed) But under verdicts it shows nothing blocked. Why?? Verdicts: Allow: 4335107 ( 59.187%) Block: 0 ( 0.000%) Output says: Enabling inline operation Running in IDS mode --== Initializing Snort ==-- Initializing Output Plugins! Initializing Preprocessors! Initializing Plug-ins! =============================================== Information about our setup- ,,_ -*> Snort! <*- o" )~ Version 2.9.7.0 GRE (Build 149) '''' By Martin Roesch & The Snort Team: http://www.snort.org/contact#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 ============================================================================ /usr/local/snort/bin/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 =========================================================================== Please let me know in case any other information is required. Regards, Anshuman
From snort-2.9.7.0/doc/README.daq:
Configuring Snort ================= Assuming that you did not disable static modules or change the default DAQ type, you can run Snort just as you always did for file readback or sniffing an interface. However, you can select and configure the DAQ when Snort is invoked as follows: ./snort \ [--daq <type>] \ [--daq-mode <mode>] \ [--daq-dir <dir>] \ [--daq-var <var>] config daq: <type> config daq_dir: <dir> config daq_var: <var> config daq_mode: <mode> <type> ::= pcap | afpacket | dump | nfq | ipq | ipfw <mode> ::= read-file | passive | inline <var> ::= arbitrary <name>=<value> passed to DAQ <dir> ::= path where to look for DAQ module so's And from the daq README: AFPACKET Module =============== afpacket functions similar to the pcap DAQ but with better performance: ./snort --daq afpacket -i <device> [--daq-var buffer_size_mb=<#MB>] [--daq-var debug] If you want to run afpacket in inline mode, you must craft the device string as one or more interface pairs, where each member of a pair is separated by a single colon and each pair is separated by a double colon like this: eth0:eth1 or this: eth0:eth1::eth2:eth3 I think you want: snort --daq afpacket --daq-mode inline -i eth0:eth1 I believe -Q and --daq-mode inline work about the same. Hope that helps. James "Legal Disclaimer: This electronic message and all contents contain information from Cybage Software Private Limited which may be privileged, confidential, or otherwise protected from disclosure. The information is intended to be for the addressee(s) only. If you are not an addressee, any disclosure, copy, distribution, or use of the contents of this message is strictly prohibited. If you have received this electronic message in error please notify the sender by reply e-mail to and destroy the original message and all copies. Cybage has taken every reasonable precaution to minimize the risk of malicious content in the mail, but is not liable for any damage you may sustain as a result of any malicious content in this e-mail. You should carry out your own malicious content checks before opening the e-mail or attachment." www.cybage.com
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Current thread:
- Problem running Snort Inline Anshuman Anil Deshmukh (Feb 04)
- Re: Problem running Snort Inline James Lay (Feb 05)
- Re: Problem running Snort Inline Anshuman Anil Deshmukh (Feb 05)
- Re: Problem running Snort Inline Y M (Feb 05)
- Re: Problem running Snort Inline Anshuman Anil Deshmukh (Feb 06)
- Re: Problem running Snort Inline Y M (Feb 06)
- Re: Problem running Snort Inline Anshuman Anil Deshmukh (Feb 06)
- Re: Problem running Snort Inline James Lay (Feb 05)