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From: Distribution Lists (dist-lists_at_e-securenetworks.net)
Date: Mon Dec 02 2002 - 13:54:23 CST

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    I added these preprocessors using SnortCenter 0.9.6
    But aren't the rule in the wrong order ?

    preprocessor portscan2: scanners_max 3200, targets_max 5000, target_limit
    5, port_limit 20, timeout 60
    preprocessor portscan-ignorehosts: 24.167.76.32
    preprocessor portscan: $HOME_NET 4 3 portscan.log
    preprocessor portscan2-ignorehosts: 24.167.76.32

    Shouldn't the 'portscan-ignorehosts' be after 'preprocessor portscan' ?

    > Why are you using both spp_portscan and spp_portscan2 ?

    I only just moved to 1.9.0, I was using 1.8.6 before, and had spp_portscan
    configured. I wasn't sure which was the better, so I configured both :)

    What is the better, spp_portscan or spp_portscan2 ?

    Regards

    > Your alert came from spp_portscan, add the following to that line:
    > preprocessor portscan-ignorehosts: 24.167.76.32/32
    >
    > Or the following for spp_portscan2
    > preprocessor portscan2-ignorehosts: 34.167.76.32/32
    >
    > Why are you using both spp_portscan and spp_portscan2 ?
    >
    > Cheers!
    >
    > - Alberto
    >
    > Distribution Lists wrote:
    >
    >>I have this in my snort.conf
    >>
    >>preprocessor portscan2: scanners_max 3200, targets_max 5000,
    >> target_limit 5, port_limit 20, timeout 60
    >>preprocessor portscan-ignorehosts: 24.167.76.32
    >>preprocessor portscan: $HOME_NET 4 3 portscan.log
    >>preprocessor portscan2-ignorehosts: 24.167.76.32
    >>
    >>but I still getting
    >>
    >>[**] [100:1:1] spp_portscan: PORTSCAN DETECTED from 24.167.76.32
    >>(THRESHOLD 4 connections exceeded in 0 seconds) [**]
    >>
    >>So any ideas what I have missed ?
    >>
    >>Regards
    >>
    >>
    >>
    >>
    >>
    >
    > --
    > The secret to success is to start from scratch and keep on scratching.
    >
    >
    >
    >
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