Snort mailing list archives
Re: Portscan2 woes
From: Matt Kettler <mkettler () evi-inc com>
Date: Fri, 02 May 2003 14:06:19 -0400
I have the same problem... false "syn ack scan" alerts that I can reliably produce by loading a web page with a large number of embedded images....
do a kill -USR1 on your snort process and check syslog. Are you dropping a lot of packets? if so, that may be the cause.
I found that when running portscan2 and conversation I had almost 10% packet drop rate, and an absurdly high false positive rate.
Disabling it fixed the packet drop rate problem, and also made snort use significantly less memory. I guess it's just not cut out for lower-end hardware.
At 12:04 PM 5/2/2003 -0400, Robin Brown wrote:
I'd like to use it, but I keep getting alerted on what looks like normal return web traffic:
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Current thread:
- Portscan2 woes Robin Brown (May 02)
- Re: Portscan2 woes Matt Kettler (May 02)
- Re: Portscan2 woes Erek Adams (May 02)
- <Possible follow-ups>
- FW: Portscan2 woes Gavin Lowe (May 02)
- FW: Portscan2 woes Robin Brown (May 02)
- Re: Portscan2 woes Matt Kettler (May 02)