Since people asked, here is a simple script which shows how to drive
NIST Net from previously collected trace data.  Assume we have some
file which shows second-by-second delay times over some long-distance
connection (even ping round trip times will do).  Then we can give it
to the script to get NIST Net to reproduce these conditions locally.

Obviously, if you have records of other network conditions (bandwidth,
loss rates), you can use similar scripts to reproduce them too.
