Re: Network cards for IPS & query related to PFRING

[Peter Bates <peter.bates () ucl ac uk>]

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Hello all

On 24/10/2013 08:06, Anshuman Anil Deshmukh wrote:
> This is a follow-up email for my query. I have still not received an answer to my query related to PFRING. See my 
> initial mail below.

For the amount of traffic you're talking about (max 100Mbps)
you shouldn't need to use PF_RING.

Load does vary though depending on your traffic profile
and the number of rules you're running.

It is worth enabling the performance statistics:

preprocessor perfmonitor: time 300 file snort.stats pktcnt 10000

in your snort.conf will log stats to /var/log/snort/snort.stats
and you can then see the amount of traffic you're dropping.

Similarly when you stop Snort, you'll get some statistics:

egrep '(Analyzed|Dropped):.*%' /var/log/syslog (or daemon.log depending on your distribution)

There are a few suggestions in the Security Onion wiki:
http://code.google.com/p/security-onion/wiki/Hardware
and
http://www.metaflows.com/solutions2/pf-ring/

- -- 
Peter Bates
Senior Information Security Officer   Phone: +44(0)2076792049
Information Services Division         Internal Ext: 32049
University College London
London WC1E 6BT
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