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Blocking synflood with CSF

Discussion in 'Security' started by Kidades, Jun 8, 2018.

  1. Kidades

    Kidades Registered

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    My server is currently under a synflood attack. I've enabled synflood protection in CSF with the following settings

    SYNFLOOD     = On
    SYNFLOOD_RATE     = 20/s
    SYNFLOOD_BURST     = 10

    It seems to be successfully detecting them, as my log/messages is filled with
    ... server kernel: [ 944.509361] Firewall: *SYNFLOOD Blocked* IN=eth0 ...

    However, those IPs are not getting blocked (added to the deny list). I have to manually add them in order to stop the attack.

    How can I make CSF automatically add the IP to the block list once a synflood attack from it is detected?
     
    #1 Kidades, Jun 8, 2018
  2. 24x7server

    24x7server Well-Known Member

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    #2 24x7server, Jun 9, 2018
  3. cPanelLauren

    cPanelLauren Forums Analyst
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    #3 cPanelLauren, Jun 11, 2018
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