NOPs in TCP traffic

Andy Green fedora at warmcat.com
Mon Jul 12 13:16:14 UTC 2004


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On Monday 12 July 2004 13:43, Tim Waugh wrote:

> So it's just that backup.cb.ath.cx isn't putting the wscale option in
> its initial SYN packet.

That seems very clear.  But I didn't change anything AFAIK on that machine to 
make it avoid wscale, and the /proc/sys/net/ipv4/tcp_window_scaling is still 
'1' on that machine.  So I guess although NTL is choking on wscale, there is 
a difference in the kernel versions about issuing it.

Maybe some kind of note somewhere giving the echo "0" 
>/proc/sys/net/ipv4/tcp_window_scaling workaround would be good since many 
NTL and maybe other customers will be suffering when the newer kernels go out 
to wider use.  I noticed yesterday for example that the daily yum was choked, 
when I killed it and ran yum update by hand, it was not choked, it was just 
suffering the same problem with http traffic (while trying to get a new 
kernel-sourcecode!) coming at 1 or 2 bytes a second.

- -Andy

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