Snort mailing list archives
RE: No Alerts Being Generated
From: "Kaplan, Andrew H." <AHKAPLAN () PARTNERS ORG>
Date: Wed, 6 Oct 2004 12:49:41 -0400
I ran Snort in packet sniffer mode and indeed it is seeing traffic. To answer your other question about the interface, I am specifying the interface in the command line. -----Original Message----- From: sekure [mailto:sekure () gmail com] Sent: Wednesday, October 06, 2004 12:34 PM To: Kaplan, Andrew H. Cc: Martin Roesch; Snort User Group (E-mail) Subject: Re: [Snort-users] No Alerts Being Generated Andrew, Let's go back to the basics... Try running snort in packet sniffer mode, dumping the traffic to console: "snort -devi <int>". Obviously substitute your interface name for <int>. You should quickly see if Snort is seeing ANY traffic at all.... Speaking of which, are you specifying an interface on the command line when you try to run snort in nids mode??? That could be your problem. On Wed, 6 Oct 2004 11:39:04 -0400, Kaplan, Andrew H. <ahkaplan () partners org> wrote:
Hi there -- I created the test rule you had specified and then restarted Snort. I then ran a series of scans, including the fingerprint scan, using nmapFE on a
remote
machine. None of the scans resulted in alerts being shown. There is no question that something is configured wrong, unfortunately I don't know what it is. I am including the snort.conf file with this e-mail. Someone mentioned channging the EXTERNAL_NET option
from
any to !HOME_NET. I tried that approach without any difference and thereafter changed it back. Thanks for your help. -----Original Message----- From: Martin Roesch [mailto:roesch () sourcefire com] Sent: Wednesday, October 06, 2004 10:01 AM To: Kaplan, Andrew H. Cc: Snort User Group (E-mail) Subject: Re: [Snort-users] No Alerts Being Generated Have you tried making a test rule? How about: alert tcp any any -> any any (msg: "TCP packet";) put that in a file called test.rule then run snort -c test.rule -A console -N for a couple minutes and surf around the web, you should have alerts. If you don't have alerts then something is probably configured wrong, if you do have alerts then your test case (running Newt in front of Snort) probably isn't generating anything that Snort is looking for. Try running some real attacks or an nmap fingerprint scan. -Marty On Oct 6, 2004, at 8:00 AM, Kaplan, Andrew H. wrote:Hi there -- (sorry if this a repeat of a message sent out) I made the change within the snort.conf file you had suggested. I also ran the snort -T command and it ran through the configuration without reporting back any errors. Finally, I installed NeWT, the Windows version of Nessus, on another machine and ran several different tests on the snort box. The tests I ran were portscans and the "SANS Top 20" list. After the scans were finished, I checked the alert file as well as the ACID GUI. Neither one mentioned any alert conditions taking place. As a further test, I changed the !HOME_NET setting back to any to see if that made any difference. It did not. What should I look for next? -----Original Message----- From: Nigel Houghton [mailto:nigel () sourcefire com] Sent: Wednesday, September 29, 2004 4:57 PM To: snort-users () lists sourceforge net Cc: Kaplan, Andrew H. Subject: Re: [Snort-users] No Alerts Being Generated Well the first thing I see in your file is the EXTERNAL_NET variable is set to any. You might want to set that to !$HOME_NET for a start. Second, you can run snort -T -c /etc/snort/snort.conf to test your snort configuration. Next thing is to make sure your snort box is listening on a span port of a switch or a tap or a hub (probably not using one in your case I think) and that the span port/tap is configured correctly. Then, if possible, you could try generating some traffic that Snort should alert on, like maybe a web request for ftp.pl which should set off sid 1107. You could run some nessus tests or just do it manually with a straightforward http://www.yourwebhost.org/ftp.pl or pick some other simple rule to test. On 0, snort-users-request () lists sourceforge net allegedly wrote:3. No Alerts Being Generated (Kaplan, Andrew H.) --__--__-- Message: 3 From: "Kaplan, Andrew H." <AHKAPLAN () PARTNERS ORG> To: "Snort User Group (E-mail)" <snort-users () lists sourceforge net> Date: Wed, 29 Sep 2004 15:35:26 -0400 Subject: [Snort-users] No Alerts Being Generated This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_000_01C4A65B.7895D89C Content-Type: text/plain; charset="iso-8859-1" I completed installing snort 2.2.0 (build 30) and have begun running it. The ACID GUI and /var/log/snort/alert files have not shown any alerts even though the program has been running for over an hour. To verify therewereno syntax errors in the snort.conf file, I ran the following: snort -c /etc/snort/snort.conf There were no errors and warnings, and the program appears to be running properly. Where in snort.conf and elsewhere, should I check for configuration mistakes? I have included the snort.conf file here. Thanks. <<snort.conf.29sept04.txt>>------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl _______________________________________________ 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://www.geocrawler.com/redir-sf.php3?list=snort-users-- Martin Roesch - Founder/CTO, Sourcefire Inc. - +1-410-290-1616 Sourcefire - Discover. Determine. Defend. roesch () sourcefire com - http://www.sourcefire.com Snort: Open Source Network IDS - http://www.snort.org
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Current thread:
- RE: No Alerts Being Generated Kaplan, Andrew H. (Oct 05)
- <Possible follow-ups>
- RE: No Alerts Being Generated Kaplan, Andrew H. (Oct 06)
- Re: No Alerts Being Generated Martin Roesch (Oct 06)
- RE: No Alerts Being Generated Lance Boon (Oct 06)
- RE: No Alerts Being Generated Kaplan, Andrew H. (Oct 06)
- Re: No Alerts Being Generated sekure (Oct 06)
- RE: No Alerts Being Generated Kaplan, Andrew H. (Oct 06)
- RE: No Alerts Being Generated Lance Boon (Oct 06)
- RE: No Alerts Being Generated Kaplan, Andrew H. (Oct 06)
- RE: No Alerts Being Generated Michael Steele (Oct 06)