Snort mailing list archives
Get reliable SnortSP drop statistics
From: Loïc Etienne <loic.etienne () cern ch>
Date: Wed, 13 May 2009 14:52:31 +0200
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 Examples: 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, (...) 1242218389,0.000,530.755,0.000,77.491,858,74.349,505.810,483.263,928.088,177.573,450360,450360,106.160,0,153813,0.000,0.000,0.000,0.000,0.000,0.000,0,0,0,0,8,0.852,0.948,98.200,14.748,18.953,66.300,2.367,2.657,94.976,16.991,21.658,61.351,8.667,10.020,81.313,0.248,0.321,99.432,0.607,0.672,98.721,99.688,0.181,0.131,530.755,0.000,0.000,1.223,531.977,857,0,0,1439,858,77.385,0.000,0.000,0.106,77.491,46453551,0,0,0.000,0.000,0,0,450360,130207,169289,150880,283.355,50.508,256.326,0.000,0.000,0,0,0.000,0,0.000,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 ! Cheers, Loïc Etienne
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Current thread:
- Get reliable SnortSP drop statistics Loïc Etienne (May 13)
- Re: Get reliable SnortSP drop statistics Russ Combs (May 13)