Re: CentOS5 Network Problems

["semi linux" <linuxsemi@xxxxxxxxx>]

On 9/20/07, Joshua Baker-LePain <jlb17@xxxxxxxx> wrote:
> On Thu, 20 Sep 2007 at 4:31pm, semi linux wrote
>
> > I have a very odd problem connecting to some websites from my CentOS 5 box
> >
> > Target websites:
> > www.connecttech.com
> > www.3ware.com
> > (two of my HW vendors)
> >
> > I can usually get some kind of response, but if the content (download
> > or page itself) is larger in size (downloads never pass 100K), then it
> > hangs...
>
> I had an odd issue with an FC6 laptop on a hotel wireless network where
> any encrypted traffic (ssh, https) would hang after a certain amount.
> The fix was to turn off TCP window scaling
> (echo 0 > /proc/sys/net/ipv4/tcp_window_scaling).  Some googling revealed
> that some routers have issues with TCP window scaling - I don't know why
> it only affected encrypted traffic in my case, but the fix may be worth a
> shot for you.
>
> --
> Joshua Baker-LePain
> QB3 Shared Cluster Sysadmin
> UCSF

Wicked! that worked... How weird...  I'm going to have to look this up
and read about it... it seems weird that the kernel would have it on
by default if it's as common as it seems to me.

Thanks a million!

You don't happen to have any links of where you found this, do you?

- G
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