[e2e] Windows XP TCP Behaviour

Sam Jansen sam.jansen at gmail.com
Thu Feb 10 17:18:11 PST 2005

I have recently been doing some testing of TCP implementations on an 
isolated network we have available in our research group. I've noticed 
some odd behaviour from Windows XP Service Pack 2 and was wondering if 
anybody else had encountered such weirdness and whether it affects other 
versions of Windows.

I've described the most notable problem at:


What we see here is that Windows is sending data outside of the 
receivers advertised window!

I've also noticed Windows sending weird sized packets in what is 
supposed to be a simple bulk data transfer (often sending packets with a 
lot less than an MSS worth of data).

Note that the situation described in that link is very simple; just two 
machines connected over an otherwise unused bottleneck link.

Sam Jansen                                           sam at wand.net.nz 
Wand Network Research Group             http://www.wand.net.nz/~stj2

More information about the end2end-interest mailing list