How to check the network card speed of Linux

We all know that ifconfig -a can list all network cards, but how to determine whether it is a Gigabit network card or a 100M network card?

1. Determine whether it is a Gigabit network card or a 100M network card

ethtool ethx Check the supported rate (Recommended learning: linux operation and maintenance)

The actual network card speed can be seen at Speed ​​100Mb/s; Question Okay, does the speed of the Gigabit network card have to be 1000M?

Not necessarily, the network card speed is related to the network cable and switch port speed. See the Auto-negotiation field. On means to enable

automatic negotiation. After plugging in the network cable, both ends will It will automatically negotiate a supported rate.

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