Using windows/dos ping to test qos

Cisco IP-SLA is a much better solution, but for a quick test you can use ping with the -v option to set the DCSP or TOS of the packets.  This might allow you to show that ping responses are different for different classes of traffic over a congested network.

The one catch is that it isn't obvious what value to use for the -v option - some trial and error with Wireshark tells me that -v 185 will give DCSP of EF, but the mapping is slightly different to what I had expected).