Mike,
Check in your Virtuozzo VE under services / iptables. You *may* be able to do something there, but I am not sure.
What you are looking for is a traffic or packet shaper that will impose limits on bandwidth transfer. It can be done at the server or client (for simulations) but I'm not real sure exactly how in a UNIX or Windows environment, only at the router level.
But it *can* be done. If the iptables doesn't do it, I can do it in the hardware node of the VE, but then it wouldn't be under your control and hence worthless.
