netdev - Re: Enable syn cookies by default

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Message-ID: <b2cc26e40910150159q68ce555fs4b1683969d939d25@mail.gmail.com>
Date:	Thu, 15 Oct 2009 10:59:03 +0200
From:	Olaf van der Spek <olafvdspek@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Enable syn cookies by default

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?
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