I'm fairly sure there's an iPerf clone for Windows..... 
http://linhost.info/2010/02/iperf-on-windows/
Worst case, generate a suitable size file full of zeros and do windows 
file copies!
Do they have managed switches?  Could you get SNMP data off them?
Chris
On 14/01/13 22:31, Chris Dennis wrote:
> Hello folks
>
> Sorry to mention the W word...
>
> A client of mine, a small business in Fordingbridge, uses various Sage 
> products on Windows 7 which generate a lot of LAN traffic, and they're 
> experiencing various intermittent problems.
>
> There's a Linux server on the network, but it seems to be 
> Windows-to-Windows networking that's causing the trouble.
>
> Does anyone know of ways to stress-test the network to pinpoint the 
> problems?
>
> I don't yet know if it's a hardware or software issue.
>
> There are all sorts of tweaks that can be applied to network card 
> drivers, but I don't want to start just twiddling knobs at random 
> (because you can get arrested for that).
>
> cheers
>
> Chris
-- 
Please post to: Hampshire@???
Web Interface: 
https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: 
http://www.hantslug.org.uk
--------------------------------------------------------------