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Re: window tracking firewall involved, was: Re: preliminary conclusions

To: "David S. Miller" <davem@xxxxxxxxxx>
Subject: Re: window tracking firewall involved, was: Re: preliminary conclusions regarding window size issues
From: Martin Josefsson <gandalf@xxxxxxxxxxxxxx>
Date: Thu, 08 Jul 2004 18:34:57 +0200
Cc: bert hubert <ahu@xxxxxxx>, jamie@xxxxxxxxxxxxx, shemminger@xxxxxxxx, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, ALESSANDRO.SUARDI@xxxxxxxxxx
In-reply-to: <20040708083708.5f63bc71.davem@redhat.com>
References: <20040707232757.GA14471@outpost.ds9a.nl> <20040708014443.GE17266@mail.shareable.org> <20040708060326.GA22258@outpost.ds9a.nl> <20040708063700.GA23496@outpost.ds9a.nl> <20040708083708.5f63bc71.davem@redhat.com>
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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!
> 
> It's the netfilter patches added to the gentoo WOLK kernel running
> on packages.gentoo.org
> 
> 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.
> 
> I bet if the tcp-window-scaling diff is removed from the kernel running
> there, the problem will totally go away.
> 
> 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=7 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.

-- 
/Martin

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