Snort mailing list archives
Re: Snort 2.0.4 CPU Utilization\Optimization
From: Edin Dizdarevic <edin.dizdarevic () interActive-Systems de>
Date: Fri, 21 Nov 2003 09:27:12 +0100
Hi, You probably do not have much space for further optimizations regarding your system. For your libpcap you may try settings like "PCAP_FRAMES=max snort ..." Try further optimizing your ruleset, deactivating all unnecessary rules. 500 rules are not so many but my experience is, that for common server environments something about 100-150 rules are more than enough. It would be interessting to know how your network environment looks like. The next issue are the preprocessors. Do you need all of them? http_decode: Are you really using IIS as well as Apache? The only relevant setting for Apache is "full_whitespace". You can deactivate the rest. rpc_decode: Concider deactivating Stream4: For memcap try something up to 32MBs. Checkt the memory consumption anyway. What other processec dou you have on the machine running. Stream4_reassemble: Deactivate ports you're not using. Port 53 -> DNS is using UDP, AFAIK Stream4_reassemble is for TCP only. frag2: timeout: 60 seconds -> Check how long your systems are waiting for fragments. For ex. Linux will only wait 30s. Set this accordingly. Give frag2 mor memory. If you have your sensor behind a Linux firewall deactivate this preprocessor since Netfilter always defragments. telnet_decode: Concider dactivating. Regards, Edin Mark Ewert schrieb:
Greetings,
[...]
Thanks in advance!
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Current thread:
- Snort 2.0.4 CPU Utilization\Optimization Mark Ewert (Nov 20)
- Re: Snort 2.0.4 CPU Utilization\Optimization Edin Dizdarevic (Nov 21)
- Re: Snort 2.0.4 CPU Utilization\Optimization Edin Dizdarevic (Nov 21)
- Re: Snort 2.0.4 CPU Utilization\Optimization Matt Kettler (Nov 21)
- Re: Snort 2.0.4 CPU Utilization\Optimization Edin Dizdarevic (Nov 21)
- RE: Snort 2.0.4 CPU Utilization\Optimization Tim (Nov 21)
- <Possible follow-ups>
- RE: Snort 2.0.4 CPU Utilization\Optimization Mark Ewert (Nov 20)
- RE: Snort 2.0.4 CPU Utilization\Optimization Kreimendahl, Chad J (Nov 20)
- RE: Snort 2.0.4 CPU Utilization\Optimization Mark Ewert (Nov 21)
- RE: Snort 2.0.4 CPU Utilization\Optimization Mark Ewert (Nov 21)
- RE: Snort 2.0.4 CPU Utilization\Optimization Kreimendahl, Chad J (Nov 21)
- Re: Snort 2.0.4 CPU Utilization\Optimization Jason Haar (Nov 21)
- Re: Snort 2.0.4 CPU Utilization\Optimization Edin Dizdarevic (Nov 21)