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kernel: possible SYN flooding on port 80. Sending cookies.

Discussion in 'Security' started by ukagg, Dec 20, 2010.

  1. ukagg

    ukagg Active Member

    Joined:
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    Hi,

    Looks like my server is under ddos attack.

    Apache keeps failing.

    /var/log/messages shows following:-

    Dec 20 23:18:11 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:19:11 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:20:14 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:21:15 ns4 kernel: possible SYN flooding on port 80. Sending cookies.

    I have already enabled Connection Tracking (CT_LIMIT = 120) in CSF firewall, but still attack continues. Can someone help.

    Thanks
    UKA
     
  2. GaryT

    GaryT Well-Known Member

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    In CSF config Look for:

    SYNFLOOD = 1
     
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