[Snort-users] snort not catching any packets

Robert W rwawrig at ...131...
Fri Apr 26 10:46:43 EDT 2013

I've found the issue, if anyone is wondering why snort is not capturing anything even when are no errors and all looks ok.
The rules which I've downloaded from snort.org have most of the alerts commented within the rule files. After I've enabled all the alerts from scan.rules, my scans started to get logged by snort.


 From: Robert W <rwawrig at ...131...>
To: "snort-users at lists.sourceforge.net" <snort-users at lists.sourceforge.net> 
Sent: Friday, April 26, 2013 10:31 AM
Subject: [Snort-users] snort not catching any packets


I'm new to snort, so probably I'm missing something obvious..
I'm running snort with output unified2 and barnyard2 which is saving to mysql, and snorby as front-end.
Snort is not catching anything with only the rules enabled (snort.conf -> Step #7: Customize your rule set). The "merged.log" unified2 file stays at 0 bytes.
If I enable decoder and preprocessor event rules (#Step 8) then it starts catching events, but are coming up as Snort Alert [xxx:y:z]. The alerts are not mapped to names.

Also barnyard is giving this message:
[Event: 1] with [gid: 120] [sid: 3] [rev: 1] [classification: 2] [priority: 3]    was not found in barnyard2 signature cache, this could lead to display inconsistency. To prevent this warning, make sure that your sid-msg.map and gen-msg.map file are up to date with the snort process logging to the spool file.

I've checked again and again all the conf files and the variables, all point to the correct sid-msg.map and gen-msg.map. 

Any idea what may be wrong?

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