Re: Possible TCP Problem with RH6.2 talking to Solaris2.6/2.7 (fwd)

From: James Sutherland (
Date: Thu May 04 2000 - 07:58:57 EST

On Thu, 4 May 2000, Alan Cox wrote:

> > > The Sun used a larger window (64K versus 32K).
> >
> > Check that Networking options ... IP: Allow large windows is enabled in
> > your kernel build. This could be related to case 2?
> We will only offer 32K windows if the box the other end offers no window
> scaling either way. This is because we care about interworking with old
> equipment with sign handling bugs.

These Sun boxes certainly shouldn't fall into that category, though,

> Turning on large window support gives a bigger window but while that
> reduces the number of zero window stalls it doesnt change total throughput

Unless the zero window stalls are causing the throughput bottleneck...

> > Using a larger receive window on the Linux end could help, anyway. Any
> > ideas WHY those packets were dropped, BTW?
> This is the important one I think

Yes... Could the two issues be related? (i.e. window problems causing
occasional dropped packets?)


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