Re: [Snort-users] Drifting timestamps

Hi Jacob,

It could be but IIRC Barnyard is just reading the timestamps from the
unified files for its insertions. I just checked the code and
Barnyard's ACID database plugin gets timestamps from the unified file.
Might be MySQL, but that would be weird...

-Marty

On Oct 18, 2004, at 3:18 PM, Jacob Roberts wrote:

> We check the timezones and clocks of all the systems involved. They
> are
> all correct and don't drift from day to day.
>
> They daily routine is to Stop barnyard, stop snort, drop the Mysql
> database(not just deleted the records), re-create the database, start
> snort, start barnyard.
>
> At the time everything is restarted the timestamps are in sync with
> correct time. As the system runs the timestamps drift
>
> We've narrowed it down to on of the following:
> 1. Something weird in Snort (probably not)
> 2. Something in Barnyard (we've no idea)
> 3. Something in Mysql. (We've added a timestamp column to the
> event table and it auto-inserted correct timestamps. So we don't thing
> its Mysql)
>
> Could this be a Barnyard thing?
>
> -----Original Message-----
> From: Martin Roesch [mailto:roesch@sourcefire.com]
> Sent: Sunday, October 17, 2004 9:10 AM
> To: Jacob Roberts
> Cc: snort-users@lists.sourceforge.net
> Subject: Re: [Snort-users] Drifting timestamps
>
>
> 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
>>
>>
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> --
> 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
>
>
--
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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