linux-kernel - Re: [PATCH] tcp: limit window scaling if window is clamped

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Message-Id: <20060818.170030.74563682.davem@davemloft.net>
Date:	Fri, 18 Aug 2006 17:00:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...l.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: limit window scaling if window is clamped

From: Stephen Hemminger <shemminger@...l.org>
Date: Fri, 18 Aug 2006 10:29:38 -0700

> This small change allows for easy per-route workarounds for broken hosts or
> middleboxes that are not compliant with TCP standards for window scaling.
> Rather than having to turn off window scaling globally. This patch allows
> reducing or disabling window scaling if window clamp is present.
> 
> Example: Mark Lord reported a problem with 2.6.17 kernel being unable to
> access http://www.everymac.com
> 
> # ip route add 216.145.246.23/32 via 10.8.0.1 window 65535
> 
> I would argue this ought to go in stable kernel as well.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...l.org>

I want to think about this some more, it might have unintended
consequences.  I really am not all that thrilled about putting in
workaround for this problem especially if it hurts a legitimate use of
some kind.
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