NOPs in TCP traffic

[Andy Green]

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On Monday 12 July 2004 12:05, Tim Waugh wrote:

Hi Tim -

Thanks for your fast and informative reply!

> 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.

Right, I heard of this but didn't put two and two together.

> Try 'echo 0 > /proc/sys/net/ipv4/tcp_window_scaling'.  For me, this
> makes the problem go away entirely.

Yes, me too, thanks for the tip.

> So is this a Linux kernel problem, or a problem at the ISP's end?
> I am seeing this too -- and I have the same ISP.

Ho hum... trying to tell NTL they have a problem doesn't sound like fun.

However... this other machine here with 2.6.7-1.437 says:

[media at backup media]$ cat /proc/sys/net/ipv4/tcp_window_scaling
1

and it does not exhibit the problem.  Oh well, I'm happy with the workaround 
so far.

Thanks again,

- -Andy

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