I asked Christian Cachin, and he pointed me to PlanetLab and Emulab:

  http://www.emulab.net/
  http://www.planet-lab.org/

"Adam Langley" <agl@imperialviolet.org> writes:

> On Fri, Sep 19, 2008 at 4:26 PM, Martin Geisler <tracker@viff.dk> wrote:
>> I think it would be very interesting to setup a system using this
>> so-called network emulator:
>>
>>  http://wanem.sourceforge.net/
>
> This is the common way to do such things:
>
> http://www.linuxfoundation.org/en/Net:Netem

Excellent, thanks for the link! I had not found that in my search.

So I think we should setup the three laptops from the Danisco auction
(see http://tracker.viff.dk/issue64) with netem and configure each
machine to delay its outgoing packets for 100-200 ms. And then run lots
of benchmarks!

I think it would be very interesting to setup a system using this
so-called network emulator:

  http://wanem.sourceforge.net/

It allows you to configure a machine to be a WAN emulator which can
delay, drop, reorder, etc. packets that pass through it. From reading
hte setup guide it actually sounds quite easy :-)