Re: Large Packet Drop with SNort-2.9.80 as compared to Snort-2.9.7.6
"Nageswara Rao A.V.K (navk)" <[email protected]>
| Newsgroups | gmane.comp.security.ids.snort.devel |
|---|---|
| Message-ID | <[email protected]> |
Hi Dheeraj, We need more info to get in to conclusion. Are you passing same traffic in both scenario’s?? Did you verify snort logs ?? You may know the reason for pkt drops. We did not notice this problems in our observation. More details may help us to analyze the problem. Best Regards, -ANR From: Dheeraj Gupta [mailto:[email protected]] Sent: Monday, December 14, 2015 11:30 AM To: [email protected] Subject: [Snort-devel] Large Packet Drop with SNort-2.9.80 as compared to Snort-2.9.7.6 Hi, I just upgraded to Snort-2.9.8.0 from Snort-2.9.7.6. Before the upgrade one of my sensors showed (somewhat expected) packet drops. However, after the upgrade the packet drop increased significantly even though the number of rules decreased (as SO rules are not in use with 2.9.8.0). I am still using Snort-2.9.7.6 rulesets (as advised by you). Here is a snip from my snort.stats file for 2.9.8.0 #time,pkt_drop_percent,wire_mbits_per_sec.realtime 1450068900,33.873,124.415 1450069200,23.718,121.253 1450069500,26.014,120.349 1450069800,26.368,120.821 1450070100,23.706,116.493 1450070400,21.039,121.363 For Snort-2.9.7.6, the snip is #time,pkt_drop_percent,wire_mbits_per_sec.realtime 1450071180,0.000,79.159 1450071480,0.000,118.671 1450071780,2.146,132.186 1450072080,8.337,130.408 Looking at end-of-snort stats. This is for 2.9.8.0 Packet I/O Totals: Received: 804563792 Analyzed: 388361098 ( 48.270%) Dropped: 298207658 ( 27.042%) Filtered: 415840607 ( 51.685%) Outstanding: 362087 ( 0.045%) Injected: 0 And this is for 2.9.7.6 Packet I/O Totals: Received: 60969886 Analyzed: 30035104 ( 49.262%) Dropped: 742645 ( 1.203%) Filtered: 30927585 ( 50.726%) Outstanding: 7197 ( 0.012%) Injected: 0 I have a longish BPF filter, so is the filtered count an indication of the amount of traffic which was filtered by that filter? Also is dropped count a subset of analyzed count or received count? I ask this because it appears received_count = analyzed + filtered so dropped_count doesn't really fit in Regards, Dheeraj ------------------------------------------------------------------------------ _______________________________________________ Snort-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/snort-devel Archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel Please visit http://blog.snort.org for the latest news about Snort!