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Re: [PATCH] fix tcp_default_win_scale.

To: Stephen Hemminger <shemminger@xxxxxxxx>
Subject: Re: [PATCH] fix tcp_default_win_scale.
From: Redeeman <lkml@xxxxxxxxxxx>
Date: Wed, 07 Jul 2004 01:19:25 +0200
Cc: "David S. Miller" <davem@xxxxxxxxxx>, bert hubert <ahu@xxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxx>, netdev@xxxxxxxxxxx, alessandro.suardi@xxxxxxxxxx, phyprabab@xxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, LKML Mailinglist <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <20040706114741.1bf98bbe@dell_ss3.pdx.osdl.net>
References: <32886.63.170.215.71.1088564087.squirrel@www.osdl.org> <20040629222751.392f0a82.davem@redhat.com> <20040630152750.2d01ca51@dell_ss3.pdx.osdl.net> <20040630153049.3ca25b76.davem@redhat.com> <20040701133738.301b9e46@dell_ss3.pdx.osdl.net> <20040701140406.62dfbc2a.davem@redhat.com> <20040702013225.GA24707@conectiva.com.br> <20040706093503.GA8147@outpost.ds9a.nl> <20040706114741.1bf98bbe@dell_ss3.pdx.osdl.net>
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On Tue, 2004-07-06 at 11:47 -0700, Stephen Hemminger wrote:
> Recent TCP changes exposed the problem that there ar lots of really broken 
> firewalls 
> that strip or alter TCP options.
> When the options are modified TCP gets busted now.  The problem is that when
> we propose window scaling, we expect that the other side receives the same 
> initial
> SYN request that we sent.  If there is corrupting firewalls that strip it then
> the window we send is not correctly scaled; so the other side thinks there is 
> not
> enough space to send.
> 
> I propose that the following that will avoid sending window scaling that
> is big enough to break in these cases unless the tcp_rmem has been increased.
> It will keep default configuration from blowing in a corrupt world.
so this should fix the issues? can you also tell me why this suddenly happend? 
that would make me a real happy man

> Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx>

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