Published at LXer:

The ethtool utility provides ethernet card information and management to die for. Do you think you have a network bottleneck that’s somehow related to your NIC’s speed or other settings? If so, ethtool might be the utility that will save the day and many painful conversations. Ethtool is a privileged user only (root), powerful system tool that allows you to query and change settings for your system’s ethernet cards. Using it, you can change almost every aspect of a supported card; from the basic to the esoteric.

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