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Re: Snort 2.9, RHEL 5 and afpacket DAQ
From: Ralf Spenneberg <ralf () spenneberg de>
Date: Tue, 19 Oct 2010 07:39:34 +0200

Hi Russ,

Am Montag, den 18.10.2010, 15:36 -0400 schrieb Russ Combs:
Check the DAQ distro README for how to use this option:
--daq-var buffer_size_mb=<#MB>
You pass that to Snort which gives it to afpacket.

Thanks a lot for the suggestion, but Looking at the source it should use
a default of 128M if nothing is specified.

Anyway. I played around with the option and apparently I can set it to
49M but not more on this system. Therefore the default did not work!
System:
RHEL5, 4GB, 64bit Kernel: 2.6.18-194.el5

Any clue what might be the restricting factor? Oh, by the way using
PCAP-FRAMES I can use a 2GB ring buffer, so it must be some special
restriction to the afpacket ringbuffer.

Any ideas? Anybody else using the feature on RHEL/CentOS?

Ralf





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