On 6/17/05, [email protected] <[email protected]> wrote:
> On Fri, 17 Jun 2005 03:47:00 +0200, Lars Roland said:
> >
> >
> > On 6/17/05, Alejandro Bonilla <[email protected]> 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
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