From: "Ric Messier" <kilroy@WasHere.COM>
To: 'Bgs' <bgs@bgs.hu>, netfilter@lists.netfilter.org
Subject: RE: syn DDoS attack solution
Date: Thu, 31 May 2007 14:08:01 -0600 [thread overview]
Message-ID: <015e01c7a3bf$64fbe7e0$2ef3b7a0$@COM> (raw)
In-Reply-To: <465EF582.4070904@bgs.hu>
Bgs writes:
>
> We recently got under a low traffic botnet DDoS attack. All attacker
> nodes opened a single tcp session (just SYN part) and then did nothing.
> This rules out rate limiting solutions and syncookie doesn't help
> either. (Thousands of attacking nodes).
>
This is simply a SYN flood attack. It may or may not be a botnet (though
saying botnet makes it sound sexier :-) ). A decent SYN flood attack tool
would randomize the source address anyway.
You should try reading the following as a starting point:
http://www.securityfocus.com/infocus/1729
Your second suggestion has been implemented in the TCP/IP stack forever. The
article above gives guidance on how to tune it in a Linux implementation.
Ric
next prev parent reply other threads:[~2007-05-31 20:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 16:19 syn DDoS attack solution Bgs
2007-05-31 19:57 ` R. DuFresne
2007-06-01 9:45 ` Bgs
2007-05-31 20:08 ` Ric Messier [this message]
2007-06-01 1:20 ` Tony.Ho
2007-06-01 9:44 ` Bgs
2007-06-01 15:01 ` Ric Messier
2007-06-01 15:37 ` Bgs
2007-06-02 19:07 ` R. DuFresne
2007-06-04 14:22 ` Ric Messier
2007-06-04 17:24 ` Martin McKeay
2007-06-04 23:16 ` R. DuFresne
2007-06-05 8:29 ` Bgs
2007-06-05 14:16 ` Steven M Campbell
2007-06-05 15:22 ` ..prevention, was: " Arnt Karlsen
2007-06-05 15:40 ` Steven M Campbell
2007-06-05 15:40 ` Steven M Campbell
2007-06-05 18:34 ` Arnt Karlsen
2007-06-07 18:41 ` Martin McKeay
2007-06-08 1:40 ` Arnt Karlsen
2007-06-12 18:10 ` Martin McKeay
2007-06-12 22:44 ` R. DuFresne
2007-06-13 14:24 ` Martin McKeay
2007-06-13 17:26 ` Arnt Karlsen
2007-06-13 17:44 ` Martin McKeay
2007-06-14 19:43 ` R. DuFresne
2007-06-14 20:13 ` supportnew
2007-06-01 21:34 ` Martijn Lievaart
2007-06-01 21:37 ` Martijn Lievaart
2007-06-01 21:38 ` Ric Messier
2007-06-01 23:09 ` Ethy H. Brito
2007-06-19 18:22 ` R. DuFresne
2007-06-19 22:19 ` Robert Nichols
2007-06-19 23:02 ` Pascal Hambourg
2007-06-21 18:26 ` R. DuFresne
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