Date: Tue, 29 Jun 2004 13:59:22 -0700
From: "David S. Miller" <davem@redhat.com>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: debi.janos@freemail.hu, linux-kernel@vger.kernel.org,
       linux-net@vger.kernel.org
Subject: Re: 2.6.7-mm1 - 2.6.7-mm4 weird http behavior
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On Tue, 29 Jun 2004 13:35:01 -0700
Stephen Hemminger <shemminger@osdl.org> wrote:

> FYI - gentoo works for window scale 0..2 and appears to fail for >3.
> 
> Also, the socket ends up with:
> 
> State      Recv-Q Send-Q      Local Address:Port          Peer Address:Port
> ESTAB      0      0             172.20.1.73:34452       198.63.211.232:http
>          ts sack wscale:0,3 rto:332 rtt:66.375/50.5 cwnd:3

Yes, I've seen this declared in other reports too.

It probably means just that for window scales of 0..2 the misinterpretation
does not result in a too-small-to-send-data window.

But I'm still confused that the scaled window is being given to the
receiver, and this makes the connection freeze.  I wonder if there is
a queer box doing NAT or similar in front of the gentoo machine which
either:

1) Applies any window scaling to both directions
2) Applies window scaling to the wrong direction

and uses this to "help" with dropping of out-of-window TCP segments.
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