For the longest time I've used a tool called LAN Speedtest with great, very accurate results. Of late the results have been all over the board.
Here's what I've tried.
LAN Speedtest
jPerf - works, but doesn't seem to really replicate real world traffic
Windows file copy and paste - works, but you have to use that windows "chart" and kind of guess at what you are getting
FTP transfers - works, but again FTP doesn't really replicate real world traffic
The problem that we are looking to resolve is that we have several connections on which users complain of slow speeds (and it's true, we can watch them work and see the performance) One of the lines is a Gig connection so even if it is "slow" it should perform pretty well for the 20 or so people that it is supporting.
So, what are your recommendations for measuring the actual bandwidth available on a connection?