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Network Security Snort-Users
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Re: [Snort-users] dropping packets

Subject: Re: [Snort-users] dropping packets
Date: Thu, 27 Jan 2005 10:10:26 -0500
Glad to have you here Marty. I'm running RHWS 3 on the sensors and I'm pretty 
sure my hardware should deliver the performance I expected - 3.2GHz Xeon with 
1Gig RAM. I have tuned stream4 preprocessor to 128MB and frag2 to use 64MB, 
although I have not seen any memory faults yet. I would try to take Barry's 
advise and upgrade my libpcap to 3.8.3 (I'm currently on 3.7.2) and hope to get 
a performance boost. Any further advise or suggestions are appreciated!

ps. I'm still at the implementation stage and that's why I'm running the 
verbose mode. I'll take it out once it go to production.

Hugo


Martin Roesch <roesch@sourcefire.com> wrote:

Hi Hugo,

Try getting rid of the -v option when you're running Snort, that may be 
draining some performance and since you're in daemon mode.  What's the 
platform/specs of the box you're running Snort on?

      -Marty

On Jan 26, 2005, at 12:32 PM, Hugo wrote:

I have realized that Snort has been dropping packets even I'm running 
it inconjuction with Barnyard. Does anybody know what causes Snort to 
drop packets? I'm running Barnyard with these options:

barnyard -c -d -g -f -s -n -w -a

and Snort with the following:

snort -c -i -g -Dv

I'm recording about 1%-2% of packets being dropped by Snort... 
sometimes as high as 6%. Many thanks!

Hugo


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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



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