Ostinato is an open-source, cross-platform network packet crafter/traffic generator and analyzer with a friendly GUI. Craft and send packets of several streams with different protocols at different rates.
More informations on http://ostinato.org/
Use interfaces starting with eth1 as traffic interfaces, eth0 is only for the (optional) management of the server/drone.
RAM: 256 MB
Documentation for using the appliance is available on http://ostinato.org/docs.html