[Snort-devel] Snort 2.9.0.x Performance hit in inline mode with NFQ
ville_vak at ...445...
Wed Aug 24 06:22:10 EDT 2011
I am trying to configure Snort126.96.36.199/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
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.
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