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Message-ID: <4ad99e05050617061864f286a2@mail.gmail.com>
Date: Fri, 17 Jun 2005 15:18:03 +0200
From: Lars Roland <lroland@gmail.com>
Reply-To: Lars Roland <lroland@gmail.com>
To: "Valdis.Kletnieks@vt.edu" <Valdis.Kletnieks@vt.edu>
Subject: Re: tg3 in 2.6.12-rc6 and Cisco PIX SMTP fixup
Cc: Alejandro Bonilla <abonilla@linuxwireless.org>,
       Christian Kujau <evil@g-house.de>,
       Linux-Kernel <linux-kernel@vger.kernel.org>
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On 6/17/05, Valdis.Kletnieks@vt.edu <Valdis.Kletnieks@vt.edu> wrote:
> On Fri, 17 Jun 2005 03:47:00 +0200, Lars Roland said:
> > 
> >
> > On 6/17/05, Alejandro Bonilla <abonilla@linuxwireless.org> wrote:
> > > one question,
> > >
> > >     Can I know what is the problem?
> > >:I have 2 tg3 adapters, lots e100's and some Cisco PIX and devices.
> > >
> > > I can try to reproduce it and see if anyone has something to say about it.
> >
> > Yes please. As I see it. Enable smtp fixup protocol on your cisco pix
> > (you will need to have a smtp server to point it to), then on some
> > linux system running with a kernel greater than 2.6.8.1 do a telnet to
> > the smtp server that is firewalled and try to issue a smtp command.
> >
> > Note that cisco has a bug report on smtp fixup banner hiding issues in
> > cisco os 6.3.4 but it should not result in the connection getting
> > dropped, it also does not explain why this problem does not seam to
> > exists on kernels prior to 2.6.9.
> 
> 2.6.9? This rings a bell.. ;)
> 
> Does disabling TCP window scaling fix it?
> 
> echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

Yes it does solve it. 

Thanks so much - this will be much easier than getting the largest ISP
in Denmark to update there Cisco to a new version.


Regards.

Lars Roland