HomeLinuxLinux networkingForce the speed and duplex of a Linux ethernet interface

Linux networking

Force the speed and duplex of a Linux ethernet interface

By Quinn McHenry

1661

Using mii-tool, the speed and duplex of an ethernet interface can be set manually.

You must set both the speed and duplex at the same time (it is not possible to auto-negotiate only one). Typical combinations are the following:

100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

To set 100 Mbps and full duplex on interface eth0, for example, use:

mii-tool -F 100baseTx-FD eth0

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Quinn was one of the original co-founders of Tech-Recipes. He is currently crafting iOS applications as a senior developer at Small Planet Digital in Brooklyn, New York.

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