Snort mailing list archives

Re: Poor bandwidth using snort 2.9.0.4 in afpacket mode


From: carlopmart <carlopmart () gmail com>
Date: Tue, 05 Apr 2011 22:25:44 +0200

On 04/05/2011 10:19 PM, Russ Combs wrote:


On Tue, Apr 5, 2011 at 3:58 PM, carlopmart <carlopmart () gmail com
<mailto:carlopmart () gmail com>> wrote:

    On 04/05/2011 09:13 PM, Russ Combs wrote:
     >
     >
     > On Tue, Apr 5, 2011 at 3:05 PM, carlopmart <carlopmart () gmail com
    <mailto:carlopmart () gmail com>
     > <mailto:carlopmart () gmail com <mailto:carlopmart () gmail com>>> wrote:
     >
     >     On 04/05/2011 08:32 PM, Russ Combs wrote:
     > > You could try commenting out the normalize_* to see if it is doing
     > > anything your traffic doesn't tolerate very well.
     > >
     >
     >     Perfect!! .. But why?? I don't understand because normalize_*
    configs
     >     are supposed to work inline mode, no?
     >
     >
     > You mean disabling normalize_* brought your throughput up to what you
     > expected?

    Correct.

     >  You could try disabling just one at a time to narrow it down.

    Ok, problems appears when "preprocessor normalize_tcp: ips ecn stream"
    is enabled.

    All works ok if I disabled this option and activating "normalize_ip4"
    and "normalize_icmp4" ...


Have you tried re-enabling the rules etc with just that disabled?



Yes, I have enabled my group rules and bandwidth is ok now ( I loose 
between 25Kb-85Kb only, but it seems correct). At least, I think ...

What is your opinion??

-- 
CL Martinez
carlopmart {at} gmail {d0t} com

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