Snort mailing list archives
Re: Snort multiple sensor configuration
From: Jack Pepper <pepperjack () afferentsecurity com>
Date: Thu, 09 Oct 2008 13:39:08 -0500
Quoting Matt Olney <molney () sourcefire com>:
Stephen, As an aside, since you're using (I'm assuming SPAN or RSPAN) sessions on the Cisco switches, make sure that you aren't dropping any packets at the swtich port. I've seen installations where they have oversubscribed their SPAN ports and have lost packets there, rather than on the interface to the Snort box.
Yes! excellent point. This is a very common deployment error. use mrtg or snmp to watch for dropped packets on the switchport that the sensor is plugged into. for example, using a 10/100 port to monitor a switch with 48 ports, I can just about guarantee that snort will drop no packets at all. because it's only going to get one percent or less of the total traffic. jp -- Framework? I don't need no stinking framework! ---------------------------------------------------------------- @fferent Security Labs: Isolate/Insulate/Innovate http://www.afferentsecurity.com ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ 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:
- Snort multiple sensor configuration Stephen Reese (Oct 08)
- Re: Snort multiple sensor configuration Jack Pepper (Oct 09)
- Re: Snort multiple sensor configuration Stephen Reese (Oct 09)
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- Re: Snort multiple sensor configuration Stephen Reese (Oct 09)
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- Re: Snort multiple sensor configuration Stephen Reese (Oct 09)
- Re: Snort multiple sensor configuration Joel Esler (Oct 10)
- Re: Snort multiple sensor configuration Stephen Reese (Oct 10)
- Re: Snort multiple sensor configuration Stephen Reese (Oct 09)
- Re: Snort multiple sensor configuration Jack Pepper (Oct 09)
- Re: Snort multiple sensor configuration Matt Olney (Oct 09)
- Re: Snort multiple sensor configuration Jack Pepper (Oct 09)
- Re: Snort multiple sensor configuration Stephen Reese (Oct 09)
- Re: Snort multiple sensor configuration Matt Olney (Oct 09)