I. What is ethtool?
Ethtool is a standard linux tool used for querying device statistics, configuration, and version information.

II. Why it's needed?
Ethtool can help diagnose issues with hardware and network level problems; display detailed statistics and configuration information on a port-by-port basis (depending on the driver); can display which versions of drivers are being used.

III. Where to get it?
Ethtool is currently included in the BT4 repositories.
This is a request to include it into the live dvd environment by default (currently, it is required for the user to run bt4-customize.sh).