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From: Andi Kleen <andi@firstfloor.org>
To: Ross Vandegrift <ross@kallisti.us>
Cc: Andi Kleen <andi@firstfloor.org>,
	Glenn Griffin <ggriffin.kernel@gmail.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Add IPv6 support to TCP SYN cookies
Date: Wed, 6 Feb 2008 09:53:57 +0100	[thread overview]
Message-ID: <20080206085357.GA1402@one.firstfloor.org> (raw)
In-Reply-To: <20080205212335.GA11287@kallisti.us>

> I work at a hosting company and we see these kinds of issues in the
> real world fairly frequently.  I would guess maybe a monthly basis.
> The servers where we have seen this are typically running RHEL 4 or 5
> kernels, so I can't really speak to how recent the kernel is in this
> specific term.

RHEL5 should be recent enough.

> 
> If I can find a box that we could temporary get a kernel.org kernel
> on, I'll see if I can get a real comparison together.  We have
> collected a few of the more effective attack tools that have been left
> on compromised systems, so it wouldn't be too difficult to get some
> numbers.

That would be useful yes -- for different bandwidths.

If the young/old heuristics do not work well enough anymore most likely we should
try readding RED to the syn queue again. That used to be pretty effective
in the early days. I don't quite remember why Linux didn't end up using it
in fact.

-Andi


  reply	other threads:[~2008-02-06  8:19 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-04 23:01 Glenn Griffin
2008-02-05 15:55 ` Andi Kleen
2008-02-05 15:42   ` Alan Cox
2008-02-05 16:39     ` Andi Kleen
2008-02-05 16:03       ` Alan Cox
2008-02-05 16:48         ` Andi Kleen
2008-02-05 16:14           ` Alan Cox
2008-02-05 20:50       ` Willy Tarreau
2008-02-05 18:29   ` Glenn Griffin
2008-02-05 19:25     ` Ross Vandegrift
2008-02-05 20:11       ` Andi Kleen
2008-02-05 21:23         ` Ross Vandegrift
2008-02-06  8:53           ` Andi Kleen [this message]
2008-02-07 19:44             ` Ross Vandegrift
2008-02-08 12:07               ` Andi Kleen
2008-02-12 20:38                 ` Ross Vandegrift
2008-02-05 20:02     ` Andi Kleen
2008-02-05 20:39       ` Evgeniy Polyakov
2008-02-05 20:53         ` Andi Kleen
2008-02-05 21:50           ` Evgeniy Polyakov
2008-02-05 21:20         ` Alan Cox
2008-02-05 21:52           ` Evgeniy Polyakov
2008-02-05 21:20             ` Willy Tarreau
2008-02-05 22:05             ` Alan Cox
2008-02-06  1:52               ` Glenn Griffin
2008-02-06  7:50                 ` Andi Kleen
2008-02-06 17:36                   ` Glenn Griffin
2008-02-06 18:45                     ` Andi Kleen
2008-02-06 23:03                       ` Glenn Griffin
2008-02-06  9:13                 ` Evgeniy Polyakov
2008-02-06 18:30                   ` Glenn Griffin
2008-02-07  7:24                     ` Evgeniy Polyakov
2008-02-07  9:40                       ` Eric Dumazet
2008-02-08  5:32                         ` Glenn Griffin
2008-02-08  5:49                           ` Glenn Griffin
2008-02-11 16:07                             ` YOSHIFUJI Hideaki / 吉藤英明
2008-02-18 23:45                               ` Glenn Griffin
2008-02-13  7:31                         ` YOSHIFUJI Hideaki / 吉藤英明
2008-02-05 19:57   ` Jan Engelhardt
2008-02-05 21:25     ` Alan Cox
2008-02-04 23:01 Glenn Griffin

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