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<body class='hmmessage'><div dir='ltr'><br><br><div><hr id="stopSpelling">From: anshuman@...16510...<br>To: snort-users@lists.sourceforge.net<br>Date: Fri, 6 Feb 2015 12:50:17 +0000<br>Subject: Re: [Snort-users] Problem running Snort Inline<br><br>



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<p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;">Hi Yaser,</span></p>
<p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;">Please see my answers inline.
</span></p>
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<p class="ecxMsoNormal"><span style="font-size:10.0pt;font-family:"Cambria","serif";color:#1F497D;"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:10.0pt;font-family:"Cambria","serif";color:#1F497D;">Regards,<br>
Anshuman Anil Deshmukh </span><span style="font-family:"Cambria","serif";color:#1F497D;">|</span><span style="font-size:10.0pt;font-family:"Cambria","serif";color:#1F497D;"> Sr. IS Analyst - Security<br>
Phone: 91-20-66041700, 91-20-66044700 (Extn. 6114)<br>
Cell: 91-99230-51641</span><span style="font-size:10.0pt;font-family:"Cambria","serif";color:#1F497D;"></span></p>
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<p class="ecxMsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";"> Y M [</span><a href="mailto:snort@...15979..."><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";">mailto:snort@...979...15979...</span></a><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";">]
<br>
<b>Sent:</b> Friday, February 6, 2015 1:02 PM<br>
<b>To:</b> Anshuman Anil Deshmukh<br>
<b>Cc:</b> snort-users<br>
<b>Subject:</b> RE: [Snort-users] Problem running Snort Inline</span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"><br>
Comments inline.</span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
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<p class="ecxMsoNormal" style=""><span style="font-family:"Calibri","sans-serif";">From:
</span><a href="mailto:anshuman@...16510..."><span style="font-family:"Calibri","sans-serif";">anshuman@...16510...</span></a><span style="font-family:"Calibri","sans-serif";"><br>
To: </span><a href="mailto:snort-users@lists.sourceforge.net"><span style="font-family:"Calibri","sans-serif";">snort-users@...6193...sts.sourceforge.net</span></a><span style="font-family:"Calibri","sans-serif";"><br>
Date: Thu, 5 Feb 2015 06:40:16 +0000<br>
Subject: [Snort-users] Problem running Snort Inline</span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Hi,</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">We have issues running Snort inline. This is the exact problem which is mentioned here -
</span><a href="http://www.linuxforums.org/forum/debian-linux/200751-snort-inline.html" target="_blank"><span style="font-family:"Calibri","sans-serif";">http://www.linuxforums.org/forum/debian-linux/200751-snort-inline.html</span></a><span style="font-family:"Calibri","sans-serif";">
 (see log below).</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">We have setup the Snort inline (version 2.9.7.0) which is compiled using switch --enable-sourcefire.
</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;">## 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.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">#Anshuman – I didn’t upgrade to DAQ 2.0.4 when I upgraded to Snort version 2.9.7.0</span></p>
<p class="ecxMsoNormal"><br></p><p class="ecxMsoNormal">* You want to update in the future. Again this may be entirely unrelated.</p><p class="ecxMsoNormal"><br></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">It says “Enabling inline operation” and then switches to IDS mode.
</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;">## 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.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">#Anshuman – Yes, I am referring to the output in Snort’s startup messages.</span><span style="font-family:"Calibri","sans-serif";color:red;"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p><p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">* Like I said above, this message should not be a problem and it can be ignored as you have proven that your ICMPs are being dropped (blocked).</span></p><p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"><br></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Our command line for running Snort:</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort_conf_rules.conf -i eth0:eth1 -Q --pid-path=/var/run</span><span style="font-family:"Calibri","sans-serif";"> which creates the bridge automatically.
 Both the interfaces doesn’t have IP addresses assigned.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;">## 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? </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">#Anshuman – Yes, my traffic flows from eth0
</span><span style="font-family:Wingdings;color:#0033CC;">à</span><span style="font-family:"Calibri","sans-serif";color:#0033CC;"> eth1.
</span><span style="font-family:"Calibri","sans-serif";color:red;"></span></p><p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;"><br></span></p><p class="ecxMsoNormal">* Try running another simple test for inbound traffic. Just to verify the rule directionality in relation to your HOME/EXTERNAL network configurations works as expected, i.e.: being blocked.</p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">We have already enabled following options for snort inline:</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">config policy_mode:inline</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">config daq: afpacket</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">config daq_mode: inline</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">config daq_var: buffer_size_mb=1024</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">preprocessor normalize_ip4</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">preprocessor normalize_tcp: ips ecn stream</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">preprocessor normalize_icmp4</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">preprocessor normalize_ip6</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">preprocessor normalize_icmp6</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">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.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">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)</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;">## 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?.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">#Anshuman – In above case I don’t know if connection was successful because the traffic wasn’t generated by me, but it was the real traffic from Internet. If I try the same
 using an ICMP rule and ping a destination, ICMP packet isn’t going through. It gets blocked. My ICMP drop rule is working fine.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">Here is the section verdict for the session in which I had kept the ICMP rule marked as drop. But you can see that “Block” is still shown as none. Is it like whatever is getting
 blocked is “Blacklist”?</span></p><p class="ecxMsoNormal"><span style="color: rgb(0, 51, 204); font-size: 12pt;"> </span></p><p class="ecxMsoNormal">* From Snort documentation: "<i>Blacklist = packets that caused Snort to block a flow from passing. This is the case when a block TCP rule fires. If the DAQ supports this in hardware, no further packets will be seen by Snort for that session. If not, snort will block each packet and this count will be higher</i>."</p><p class="ecxMsoNormal"><span style="color: rgb(0, 51, 204); font-size: 12pt;"><br></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">02/06-17:34:48.559180  [Drop] [**] [1:10000001:1] ICMP ping blocked-test rule [**] [Priority: 0] {ICMP} 192.27.6.22 -> 192.168.1.10</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">Verdicts:</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">      Allow:        20432 ( 45.983%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">      Block:            0 (  0.000%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">    Replace:            0 (  0.000%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;"> Whitelist:        23995 ( 54.001%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">  Blacklist:           12 (  0.027%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:#0033CC;">     Ignore:            0 (  0.000%)</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">But under verdicts it shows nothing blocked. Why??</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;">## Not sure why, but lets verify the above first and then lets see.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Verdicts:</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">      Allow:      4335107 ( 59.187%)</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">      <span style="color:red;">
Block:            0 (  0.000%)</span></span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";color:red;"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Output says:</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Enabling inline operation</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Running in IDS mode</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">        --== Initializing Snort ==--</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Initializing Output Plugins!</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Initializing Preprocessors!</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Initializing Plug-ins!</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";color:red;"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">===============================================</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Information about our setup-</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">   ,,_     -*> Snort! <*-</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">  o"  )~   Version 2.9.7.0 GRE (Build 149)
</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">   ''''    By Martin Roesch & The Snort Team:
</span><a href="http://www.snort.org/contact#team" target="_blank"><span style="font-family:"Courier New";">http://www.snort.org/contact#team</span></a><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">           Copyright (C) 2014 Cisco and/or its affiliates. All rights reserved.</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">           Copyright (C) 1998-2013 Sourcefire, Inc., et al.</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">           Using libpcap version 1.4.0</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">           Using PCRE version: 7.8 2008-09-05</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">           Using ZLIB version: 1.2.3</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">============================================================================</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">/usr/local/snort/bin/snort --daq-list</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">Available DAQ modules:</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">pcap(v3): readback live multi unpriv</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">ipfw(v3): live inline multi unpriv</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">dump(v2): readback live inline multi unpriv</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">afpacket(v5): live inline multi unpriv</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";">===========================================================================</span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Courier New";"> </span><span style="font-family:"Calibri","sans-serif";"></span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Please let me know in case any other information is required.</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Regards,</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";">Anshuman</span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
<p class="ecxMsoNormal"><span style="font-family:"Calibri","sans-serif";"> </span></p>
</div>
<p class="ecxMsoNormal" style="line-height:10.0pt;"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#7F7F7F;">"Legal Disclaimer: This electronic message and all contents contain information from Cybage Software Private Limited which may be
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