Snort mailing list archives
snort dropping 48% ??
From: "Sheahan, Paul" <Paul.Sheahan () priceline com>
Date: Wed, 28 Apr 2004 12:47:42 -0400
Can anyone give me a tip in this situation? I used to have a Snort 1.9 sensor running on RHLinux7 on a 100mb Ethernet network. On that sensor I ran the most of the default rules plus my own custom rule file, which contained a lot of content-based rules. It handled it no problem and didn't drop any packets. Now I've upgraded to a big beefy server, gig Ethernet, RH Linux 8.0 and Snort 2.0.5 using the same Snort config as above. Traffic levels are the same. Now I noticed it was dropping half of the traffic! My custom content rules are extremely important to me, so I performed a test. I created this bare bones snort.conf which basically disables all standard rules and extra preprocessors: var HOME_NET [10.10.0.0/16] var EXTERNAL_NET !$HOME_NET preprocessor frag2 preprocessor http_decode: 80 unicode iis_alt_unicode double_encode iis_flip_slash full_whitespace include classification.config include reference.config include /etc/snort/my.rules include /etc/snort/pass.rules Then I started Snort and let it capture traffic for a while. I stopped Snort and it is STILL dropping 48% of the traffic! My "my.rules" file contains a few hundred content-based rules. What gives? Can Snort no longer handle content-based rules? Or am I missing something here? Thanks, Paul
Current thread:
- snort dropping 48% ?? Sheahan, Paul (Apr 28)