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snort-users: [Snort-users] Get reliable SnortSP drop statistics

[Snort-users] Get reliable SnortSP drop statistics

From: Loc Etienne <loic.etienne_at_nospam>
Date: Wed May 13 2009 - 12:52:31 GMT
To: <>

Hello guys,

I'm currently running snortsp beta 3 on a link with very high traffic
(500-600mbits/s) and I have noticed something strange concerning the
packet drop statistics.

We currently run the perfmonitor preprocessor with the following config: preprocessor perfmonitor: time 600 file /opt/snort/log/current/snort.stats pktcnt 100000

When looking at its output, it always report 0.000 packet drop ratio


    1242216008,0.000,598.942,0.005,87.934,853,68.964,556.730,526.659,906.033,295.431,3173088,3173088,144.991,0,250175,0.000,0.000,0.000,0.000,0.000,0.000,0,0,0,0,8,0.000,0.000,100.000,15.421,10.819,73.760,99.455,0.298,0.247,14.802,10.048,75.150,0.020,0.000,99.977,14.971,10.249,74.779,0.118,0.103,99.778,13.328,9.072,77.600,598.942,0.000,0.000,1.664,600.606,852,0,0,1434,853,87.790,0.000,0.000,0.145,87.934,52739772,0,0,0.000,0.000,0,0,3173088,715758,943715,1514173,233.324,87.807,416.650,0.000,0.000,0,0,0.000,0,0.000,     (...)

However, when I query directly the snortsp engine with eng.stats("e1") in the LUA shell for example, I get the following:

    [*] ACTIVE data source s1 received 153960354 packets on eth2 Analyzed: 70274715 (45.645%) Dropped: 83685639 (54.355%) Idle Cycles: 70274660 [-] Ethernet Stats: Count: 70304420

Do you see any reason why these two methods would report different numbers? Is the preprocessor printing another drop ratio than the engine?

Also, we have another snort instance running on a production server
(deamon mode), and we would like to check the output of the eng.stats()
command. According to the documentation, it is possible to use the snortsp_tool to interface directly with snortsp through a kernel socket. It works fine to issue commands to snort, but we are unable to redirect it's output back to us. There is not much documentation on snortsp_tool out there, so maybe there is an easy way to do that?

Thanks in advance for your expertise !

Loc Etienne

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