Snort mailing list archives
Re: A few questions regarding Solaris
From: waldo kitty <wkitty42 () windstream net>
Date: Mon, 30 Aug 2010 12:35:27 -0400
On 8/30/2010 07:54, Robert Riskin wrote:
Also i'm running it on a heavily trafficed VLAN, lots of server and workstation traffic, to/from Internet, etc. I know that some alerts are being missed. I have tuned out a lot of the snort rulesets and use emerging markets and most of the malware rulesets. I still find myself missing alerts, for example i'll try and hit one of the RBN sites and sometimes Snort will trigger and alert and sometimes it won't. Is there anything I can do to make sure it captures everything without missing anything. My box has 10GB of Ram and 500GB 10k harddrives. So i'm not sure where the bottleneck is.
ok, so you've told us your RAM size and HDs but what about other important factors? what CPU chip are you using? what speed is that CPU chip? what NIC(s) are you using? are they server grade with their own CPU on them? you may be dealing with IRQ latency... are all not needed items turned OFF in BIOS so that those IRQs are free? are the NIC(s) on their own not-shared IRQs? are the NIC(s) on lower numbered IRQs? if your box doesn't need serial or parallel ports, disable them in the BIOS and that should open IRQs 3, 4 and 7 (at least)... it is also quite possible that your snort is just too busy and is simply not able to keep up with the traffic streaming over your NIC(s)... especially if you have a lot of rules enabled and even moreso if a lot of those rules are not as optimized as they could be... some of the preprocessors have settings where you can limit the amount of items them hold for analysis and you can also set the amount of memory they may use... it could be that your system is spending more time looking thru memory at everything than in processing it and thus some of it slips by... we need more information and details to really get any closer to the problem... ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ 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:
- A few questions regarding Solaris Robert Riskin (Aug 30)
- Re: A few questions regarding Solaris waldo kitty (Aug 30)
- Re: A few questions regarding Solaris Mike Lococo (Aug 30)
- Re: A few questions regarding Solaris Robert Riskin (Aug 31)
- Re: A few questions regarding Solaris Mike Lococo (Aug 31)
- Re: A few questions regarding Solaris Robert Riskin (Aug 31)
- Re: A few questions regarding Solaris Mike Lococo (Aug 31)
- Re: A few questions regarding Solaris Robert Riskin (Aug 31)