[Snort-users] snort inline with jumbo frame

王聲浩(Sheng-Hao Wang) howz.wang at ...11827...
Mon Sep 10 22:23:18 EDT 2012

Yes, I set the snaplen in snort.conf to 65535 and the MTU of interface also enlarge to 65535.

Without snort inline, everything looks fine with jumbo frames.
But when I queue the packerts into nfqueue for snort inline, I get the poor throughput.

Best Regards,

From: Russ Combs 
Sent: Monday, September 10, 2012 10:46 PM
To: 王聲浩(Sheng-Hao Wang) 
Cc: snort-users at lists.sourceforge.net 
Subject: Re: [Snort-users] snort inline with jumbo frame

Did you set the snaplen?

On Sun, Sep 9, 2012 at 11:34 PM, 王聲浩(Sheng-Hao Wang) <howz.wang at ...11827...> wrote:

  Hi all, 

  I am trying to run snort inline with jumbo frame traffic, the size of packet could raise to 65524.
  But I face a weird phenomenon, when I enable jumbo frame, the throughput with snort inline decreases to very low.

  Here is my test result:

        jumbo frame baseline
        jumbo frame with snort inline
        MTU 1500 baseline
        MTU 1500 with snort inline

  My snort version is and I use command "snort -N -d --daq nfq -Q -c /etc/snort/snort.conf".

  I have tried the solution of blog.inliniac.net/2008/01/23/improving-snort_inlines-nfq-performance
  But it doesn't work.  

  Does anyone have any idea? Thanks.

  Best Regards,

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