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DDOS attack

Discussion in 'Security' started by globcom, Nov 30, 2012.

  1. globcom

    globcom Well-Known Member

    Joined:
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    Hello,

    in var/log/messages

    There are many lines like this :

    Code:
    Nov 30 09:29:18 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:20 ici last message repeated 9 times
    Nov 30 09:29:23 ici kernel: net_ratelimit: 12 callbacks suppressed
    Nov 30 09:29:23 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:25 ici last message repeated 9 times
    Nov 30 09:29:28 ici kernel: net_ratelimit: 9 callbacks suppressed
    Nov 30 09:29:28 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:29 ici last message repeated 9 times
    Nov 30 09:29:34 ici kernel: net_ratelimit: 18 callbacks suppressed
    Nov 30 09:29:34 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:36 ici last message repeated 9 times
    Nov 30 09:29:39 ici kernel: net_ratelimit: 14 callbacks suppressed
    Nov 30 09:29:39 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:41 ici last message repeated 9 times
    Nov 30 09:29:44 ici kernel: net_ratelimit: 10 callbacks suppressed
    Nov 30 09:29:44 ici kernel: TCP: Possible SYN flooding on port 2222. Sending cookies.
    Nov 30 09:29:48 ici last message repeated 9 times

    It's not clear for me if is a bad config or DDOS attack.

    How to correct this ?


    Regards,
    Eric
     
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