Program to test speed of internal network?

[jmFightSpam]

Hi,

Does anyone know of a program that I can use to test the speed of my internal network? A Windows program would be preferable as I am trying to see how much throughput I am getting from my MacBook Pro running Vista over my 802.11n AEBS to my Dell PC running Windows XP Home.

Thanks.

 

[hdknight]

I also would like a function like this, although I'd prefer a Mac program, in running a mixed network.