[Snort-users] SNORT and Emulex DAG

Robert Cotter Robert.Cotter at ...17003...
Thu Nov 13 17:14:00 EST 2014

Please reach out to the Endace Support at endace.support at ...17003...<mailto:endace.support at ...17003...>   as they should be able to point you in the right direction.

Or call them US Toll Free: +1 866 501 3356

Else contact me directly and I will see what I can do.


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Robert Cotter
Field Application Engineer – Endace, a division of Emulex

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From: Bill Bernsen [mailto:bill.bernsen at ...6823...]
Sent: Friday, 14 November 2014 10:18 a.m.
To: test engineer
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] SNORT and Emulex DAG

A couple things to try:
1)  Have you confirmed your dag is configured, up, and running how you'd expect?  Check dagconfig to make sure it is receiving (and dropping) packets on all the interfaces you'd expect.  Then, attach tcpdump to one of the streams and confirm that it is working.
2)  Confirm your initscript is trying to attach to separate dag stream as network interfaces.  The debug information you provided here is sparse but it claims it doesn't have permission to attach to /dev/dag0.  I'm not sure if this is an artifact of what DAQ is doing behind the scenes but that isn't where I'd expect the data acquisition stack to connect.  It should be attaching to a network interface such as dag0:0.  What is the invocation line for snort in your script?

On Thu, Nov 13, 2014 at 1:41 PM, test engineer <test12524 at ...11827...<mailto:test12524 at ...11827...>> wrote:
Posting this again under specific subject of Emulex DAG
Still unsuccessful in getting the SNORT init.d script to work using an Emulex DAG card.  I have modified the scrip and it works just fine when executed via command line (/etc/init.d/snort {start|stop|restart} but when executed at boot the error in the messages file is:
snort [2440] Daemon initialized, signaled parent pid: 2439
snort [2440] Reload thread starting...
snort [2440] Reload thread started, thread 0x7fc5c404e700 (2441)
snort [2440] FATAL ERROR: Can't start DAQ (-1) -dag_open /dev/dag0: Permission denied.
The Snort process gets 99% through startup but fails at the point above.  A successful start from command line shows:
snort[2499]: Daemon initialized, signaled parent pid: 2498
snort[2499]: Reload thread starting...
snort[2499]: Reload thread started, thread 0x7f8bf7a0e700 (2500)
snort[2499]: Decoding Ethernet
snort[2499]: Checking PID path...
snort[2499]: Writing PID "2499" to file "/var/run//snort_dag0:0.pid"
snort[2499]:         --== Initialization Complete ==--
snort[2499]: Commencing packet processing (pid=2499)
I've tried changing permissions and/or ownership of the /dev/dag0 symbolic link plus many other "tests" all to no avail.
Any recommendations are appreciated.

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Bill Bernsen                                                    Network Security Analyst
ITS Technology Security Services, New York University
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