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Date:	Wed, 21 Oct 2009 09:17:53 +0200
From:	Olaf van der Spek <olafvdspek@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Enable syn cookies by default

On Thu, Oct 15, 2009 at 10:59 AM, Olaf van der Spek
<olafvdspek@...il.com> wrote:
> On Sat, Oct 10, 2009 at 3:01 PM, Olaf van der Spek <olafvdspek@...il.com> wrote:
>> Hi,
>>
>> I'm forwarding Debian feature request #520668.
>>
>> Could syn cookies be enabled by default?
>>
>> AFAIK syn cookies only get send when the half-open TCP connection
>> queue is full. So stuff like window scaling should work fine in normal
>> situations.
>>
>> Speaking of which:
>> When the half-open TCP connection queue is full and syn cookies are
>> enabled, you get a message like "kernel: possible SYN flooding on port
>> 2710. Sending cookies."
>> However when syn cookies are disabled, you don't get any message (in
>> kern.log), although connections to your server are timing out.
>> Could such a message be added?
>> Maybe with a suggestion to increase the size of that queue or to
>> enable syn cookies.
>>
>> Greetings,
>>
>> Olaf
>>
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=520668
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=520667
>> https://bugs.launchpad.net/ubuntu/+bug/57091
>>
>
> Somebody?

Anybody?
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