Snort mailing list archives
Re: Sensor 'sanity'
From: Jason Haar <Jason.Haar () trimble co nz>
Date: Mon, 12 Nov 2007 09:45:58 +1300
Paul Halliday wrote:
In an overtaxed environment where I just don't have the time to coddle each sensor, what is a common practice to make sure that the sensors are actually still sane? Most of my sensors are sittings on span/mirrored ports on gear that I don't directly manage.
I created some rules to check for this. alert tcp $HOME_NET 1 -> $HOME_NET 24 (msg:"Snort Test to ensure SPAN is operational"; flags:S;sid:3000001;classtype:not-suspicious; rev:1;) Then I have a daily job (running from an independent box) that "nmap -g1 -p23 " against IP addresses on the network that each IDS is meant to be monitoring. Then I check the syslogs to ensure it was triggered. That way, if someone changes the SPAN port setting,etc the rule doesn't fire and you know there is a problem. I chose weird port options like that as they are not the sort of normal thing you see - just cuts down on the noise. BTW: Checking to see that your interface packet counter is incrementing really isn't good enough - if the IDS gets accidentally moved onto another operational switch, you will still see the counter go up (due to it seeing ARPs and Broadcasts), but it wouldn't be useful. I think you need IDS tests to confirm your IDS is working. -- Cheers Jason Haar Information Security Manager, Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417 PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ 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
Current thread:
- Sensor 'sanity' Paul Halliday (Nov 08)
- Message not available
- Re: Sensor 'sanity' Paul Halliday (Nov 09)
- Message not available
- Re: Sensor 'sanity' Jason Haar (Nov 11)
- snort virtualization Youngquist, Jason R. (Nov 14)
- Re: snort virtualization Justin Heath (Nov 14)
- snort virtualization Youngquist, Jason R. (Nov 14)