To verify the behavior of your Ethernet network, you usually need to apply specialized and costly test equipment.

For example: to check if an Ethernet switch can cope with the maximum traffic, you need to generate and capture packets at wire-speed. This requires special hardware if you want to do this a the smallest packet size.

AimValley just released a proof of concept of the Smart Network Tool.
This is an SPF-based solution, capable of generating and capturing traffic at 1 Gb/s speed.