netdev - Re: [PATCH] Add IPv6 support to TCP SYN cookies

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 5 Feb 2008 20:57:58 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Glenn Griffin <ggriffin.kernel@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add IPv6 support to TCP SYN cookies


On Feb 5 2008 16:55, Andi Kleen wrote:
>On Mon, Feb 04, 2008 at 03:01:01PM -0800, Glenn Griffin wrote:
>> Add IPv6 support to TCP SYN cookies.  This is written and tested against
>> 2.6.24, and applies cleanly to linus' current HEAD (d2fc0b).  Unfortunately
>> linus' HEAD breaks my sky2 card at the moment, so I'm unable to test against
>> that.  I see no reason why it would be affected though.  Comments/suggestions
>> are welcome.
>
>Syncookies are discouraged these days. They disable too many 
>valuable TCP features (window scaling, SACK) and even without them 
>the kernel is usually strong enough to defend against syn floods
>and systems have much more memory than they used to be.
>
>So I don't think it makes much sense to add more code to it, sorry.

Distributions should then probably deactivate it by default.
SUSE 10.3 for example still has it enabled on default installs.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html