[Snort-users] Snort 2.9.0.x Performance hit in inline mode with NFQ

Russ Combs rcombs at ...1935...
Mon Aug 29 13:31:20 EDT 2011

To what are you comparing that leads to the "drastic drop"?

On Wed, Aug 24, 2011 at 6:22 AM, Ville Vak <ville_vak at ...125...> wrote:

>  I am trying to configure Snort2.9.0.5/NFQUEUE in my setup with inline mode
> and NFQUEUE.  The network throughput seems to drastically drop with the
> setup. While analyzing the cause, I read that NFQUEUE itselfs contribute to
> the major performance hit, besides the expected overhead of pattern
> matching. Even if we suppress the rules matching/preprocessors in snort, the
> unacceptable performance hit is observed.
> Given below is how I configure the NFQUEUE to send the packets to Snort.
> iptables -I FORWARD -j NFQUEUE
> and
> config daq: nfq
> config daq_dir: /usr/lib/daq/
> config daq_mode: inline
> Tuning the queue_len and Snort snaplen doesn't help much.
> Any cues on tuning the NFQUEUE performance.
> -Ville
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