Snort mailing list archives
Re: Drifting timestamps
From: "M. Shirk" <shirkdog_linux () hotmail com>
Date: Tue, 19 Oct 2004 13:23:22 -0400
I had this issue on my sensor. My time would swing a couple of minutes every week, however, timestamps were close enough for me (personal sensor, not production). If timestamps are important, make sure you synch with a local time server.
Shirkdog
From: Martin Roesch <roesch () sourcefire com> To: "Jacob Roberts" <jake_roberts () byu edu> CC: <snort-users () lists sourceforge net> Subject: Re: [Snort-users] Drifting timestamps Date: Sun, 17 Oct 2004 11:09:41 -0400 Hi Jake,That'd have to be the system clock on the sensor drifting, the timestamps that Snort uses is based on a call to gettimeofday() that libpcap performs when it receives a new packet. Snort has no internal time tracking mechanisms and in fact we take advantage of the fact that libpcap gives us time data "for free" to track time inside Snort.-Marty On Oct 15, 2004, at 6:50 PM, Jacob Roberts wrote:We have a snort setup with barnyard which dumps in to a MySQL database. We stop snort and barnyard each day, delete the database, re-create it, then restart snort and barnyard. As snort runs through the day we start to see the timestamps of alerts drift behind actual time. We aren't receiving an excessive amount of alerts so we ruled out Barnyard not being able to keep up with the alerts generated by Snort (I don't know if that would happen anyways) Has anyone had anything like this happen? We haven't been able to track it down and aren't sure what to do. Thanks, Jake Roberts Brigham Young University jake_roberts () byu edu ------------------------------------------------------- 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 usYour Opinions, Get Free ThinkGeek Gift Certificates! Click to find out morehttp://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 ------------------------------------------------------- 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
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Current thread:
- Drifting timestamps Jacob Roberts (Oct 15)
- Re: Drifting timestamps Martin Roesch (Oct 17)
- <Possible follow-ups>
- RE: Drifting timestamps Jacob Roberts (Oct 18)
- Re: Drifting timestamps Martin Roesch (Oct 21)
- RE: Drifting timestamps M. Shirk (Oct 20)
- RE: Drifting timestamps Jacob Roberts (Oct 21)
- Re: Drifting timestamps M. Shirk (Oct 21)