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Re: [PATCH] fix tcp_default_win_scale.

from [David S. Miller] [Permanent Link][Original]
To: Stephen Hemminger <shemminger@xxxxxxxx>
Subject: Re: [PATCH] fix tcp_default_win_scale.
From: "David S. Miller" <davem@xxxxxxxxxx>
Date: Tue, 6 Jul 2004 13:28:22 -0700
Cc: jamie@xxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20040706130549.31daa8e0@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> <20040706194034.GA11021@mail.shareable.org> <20040706130549.31daa8e0@dell_ss3.pdx.osdl.net>
Sender: netdev-bounce@xxxxxxxxxxx 
On Tue, 6 Jul 2004 13:05:49 -0700
Stephen Hemminger <shemminger@xxxxxxxx> wrote:

> On Tue, 6 Jul 2004 20:40:34 +0100
> Jamie Lokier <jamie@xxxxxxxxxxxxx> wrote:
> 
> > Are you saying there are broken firewalls which strip TCP options in
> > one direction only?
> 
> It appears so.

Ok, this is a possibility.  And why it breaks is that if the ACK
for the SYN+ACK comes back, the SYN+ACK sender can only assume
that the window scale was accepted.

Stephen, do you have a trace showing exactly this?
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