Subject: Re: window tracking firewall involved, was: Re: preliminary
	conclusions regarding window size issues
From: Martin Josefsson <gandalf@wlug.westbo.se>
To: "David S. Miller" <davem@redhat.com>
Cc: bert hubert <ahu@ds9a.nl>, jamie@shareable.org, shemminger@osdl.org,
        netdev@oss.sgi.com, linux-net@vger.kernel.org,
        linux-kernel@vger.kernel.org, ALESSANDRO.SUARDI@ORACLE.COM
In-Reply-To: <20040708083708.5f63bc71.davem@redhat.com>
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Date: Thu, 08 Jul 2004 18:34:57 +0200
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On Thu, 2004-07-08 at 17:37, David S. Miller wrote:

> > This has now been confirmed with the packages.gentoo.org firewall!
>=20
> It's the netfilter patches added to the gentoo WOLK kernel running
> on packages.gentoo.org
>=20
> Specifically, it's the tcp-window-tracking patch from netfilter's
> patch-o-matic.  There's some bug in there wrt. it's window scaling
> support.
>=20
> I bet if the tcp-window-scaling diff is removed from the kernel running
> there, the problem will totally go away.
>=20
> I note that it is using a very old version of the tcp-window-tracking
> patch, the current version is 2.2 and probably fixes this bug.  The
> gentoo linux-2.4.20-wolk-4.14 kernel is using version 1.7

That bug was probably fixed May 21 2003 according to cvs history.
"Patch updated: window scaling bug fixed, improved, etc. (JK)."
It updates the version to 1.9

As reference, I'm using v2.2 with -bk from 040626 which does use
wscale=3D7 and I don't see any problems connecting to/from machines with
lower or equal wscale. I drop and log all packets tcp-window-tracking
classifies as INVALID.

--=20
/Martin

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