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

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Message-ID: <20080205215027.GA24275@2ka.mipt.ru>
Date:	Wed, 6 Feb 2008 00:50:27 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
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 Tue, Feb 05, 2008 at 09:53:45PM +0100, Andi Kleen (andi@...stfloor.org) wrote:
> > How does syncookies prevent windows from growing?
> 
> Syncookies do not allow window scaling so you can't have any windows >64k

Then you meant not windows change, but the fact, that option is ignored
as long as sack enable one?

> > Most (if not all) distributions have them enabled and window growing
> > works just fine. Actually I do not see any reason why connection
> > establishment handshake should prevent any run-time operations at all,
> > even if it was setup during handshake.
> 
> TCP only uses options negotiated during the hand shake and syncookies
> is incapable to do this.

What about fixing the implementation, so that it could get into account
different options too?

> -Andi

-- 
	Evgeniy Polyakov
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