NOPs in TCP traffic

[Tim Waugh]

On Mon, Jul 12, 2004 at 01:17:43PM +0100, Andy Green wrote:

> Good guy (backup.cb.ath.cx) first, on the -437 kernel:
[...]
> 13:09:17.159653 IP backup.cb.ath.cx.57132 > mail.pumaone.net.http: S 
> 4213654806:4213654806(0) win 5840 <mss 1460,sackOK,timestamp 1555952404 
> 0,nop,wscale 0>
> 13:09:17.166999 IP mail.pumaone.net.http > backup.cb.ath.cx.57132: S 
> 732246534:732246534(0) ack 4213654807 win 8760 <mss 
> 1460,nop,nop,sackOK,nop,wscale 0,nop,nop,timestamp 1019215388 1555952404>

^^ No window scaling.

> Now the possible bad boy, -478, again in Konqueror.  I stopped the tcpdump 
> after a minute or so with nothing showing in the browser.
[...]
> 13:12:52.774832 IP fastcat1.cb.ath.cx.33647 > mail.pumaone.net.http: S 
> 1895838732:1895838732(0) win 5840 <mss 1460,sackOK,timestamp 16526534 
> 0,nop,wscale 7>
> 13:12:52.784397 IP mail.pumaone.net.http > fastcat1.cb.ath.cx.33647: S 
> 3086153146:3086153146(0) ack 1895838733 win 8760 <mss 
> 1460,nop,nop,sackOK,nop,wscale 0,nop,nop,timestamp 1019250599 16526534>

^^ Window scaling.

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

Tim.
*/
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