[Snort-users] Where is the bottleneck?

Yiming Gong yiming at ...4229...
Thu May 15 20:30:09 EDT 2003

One thing you must keep in mind ~ snort will ignore any stateless tcp
Best wishes!


Yiming Gong
Technical Manager
China Telecom System Integration Co.Ltd.

E-mail:yiming at ...4229...
 <http://security.zz.ha.cn/> http://security.zz.ha.cn

发件人: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] 代表 方 磊
发送时间: 2003年5月16日 10:48
收件人: Snort-users at lists.sourceforge.net
主题: [Snort-users] Where is the bottleneck?

I did some simple tests on snort on-line detection capacity yesterday. 
I check a tcpdump data with only 37 kinds of attacks.First, I turn off
all useless precessors, indeed only frag2 and telnet remain
opening.Snort2.0 check this data "off-line" with only 37 rules. There
find about 7700 events in about 5 seconds. Then I inject the tcpdump
data by tcpreplay from my traffic producer and detect the traffic on my
Here are the detected events with different traffic rates:
150M   3522
100M   3791
80M    3851
50M    3941
20M    4163
10M    4271
I can not understand why snort can not find most events even in very low
I think it may be problem of my machines.
My traffic producer is Intel 1.4G, 256RAM, Redhat 9.0, E1000 NIC.
My snort sensor is Intel 2.4G, 512RAM, Redhat 9.0, E1000 NIC.
Where is the bottleneck?
How can I to detect all the events on-line?

Thanks very much.


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