NOPs in TCP traffic
Dale
rhl+dale at riyescott.com
Mon Jul 12 20:20:26 UTC 2004
On Mon, Jul 12, 2004 at 12:05:03PM +0100, Tim Waugh wrote:
> The 'win 45' stuff is meant to be scaled. At the beginning of the TCP
> connection you'll see 'wscale 7' from your end, i.e. 45<<7, i.e. 5760.
>
> Try 'echo 0 > /proc/sys/net/ipv4/tcp_window_scaling'. For me, this
> makes the problem go away entirely.
>
> So is this a Linux kernel problem, or a problem at the ISP's end?
Covered in detail at http://lwn.net/Articles/92727/
A small excerpt:
In the 2.6.7 kernel, the default scale factor is zero; in Linus's
BitKeeper tree and the 2.6.7-mm kernels, instead, it has been
increased to seven. This change has brought the broken router
behavior to light; suddenly people running current kernels are
finding that they cannot talk to a number of systems out there.
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