Additional information:

If you are running Windows try using the Intel NAS Perf tester for involved tests:
http://www.intel.com/design/servers/...rf_Toolkit.htm

If you want to test your GB Network, take a look at netspeed.exe
from OptimumX http://www.optimumx.com/download/ (Assuming you have
another Windows Box to test against.)

For quick tests, a 1GB ISO file, Xcopy and the "Timeit (http://www.microsoft.com/downloads/details.aspx?familyid=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en)" resource kit utility.