Snort mailing list archives
Re: Problem running Snort Inline
From: Y M <snort () outlook com>
Date: Fri, 6 Feb 2015 07:32:25 +0000
Comments inline. From: anshuman () cybage com To: snort-users () lists sourceforge net Date: Thu, 5 Feb 2015 06:40:16 +0000 Subject: [Snort-users] Problem running Snort Inline 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. ## While might not be related, did you also upgrade the DAQ to 2.0.4? This version was released with the release of Snort 2.9.7.0 as I remember. It says “Enabling inline operation” and then switches to IDS mode. ## Are you referring to the message that output in Snort's startup messages? If I recall properly, this came up one before and as I remember that this message "can be" ignored given that you are actually running Snort inline. 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. ## While I have not tested this thoroughly, but does your traffic flows from eth0 --> eth1 or from eth1 --> eth0? If you change -i eth0:eth1 to -i eth1:eth0, what happens? 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) ## In the above case, was the connection successful? If you try the same using an ICMP rule and pinging some destination, does the ICMP packet go through?. But under verdicts it shows nothing blocked. Why?? ## Not sure why, but lets verify the above first and then lets see. 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 "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 ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. 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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)