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In computing, mii-tool is a Unix command which allows users to query and modify Network Interface Controller (NIC) parameters (eg: speed and duplex).

Since 2003,[1] it's considered obsolete and replaced by ethtool.


To display the current parameters:

$ mii-tool
eth0: no autonegotiation, 100baseTx-HD, link ok

To force the network speed to 1 Gb/s, and the duplex in full on the port 1 (eth0):

$ mii-tool -F 1000baseTx-FD eth0
$ mii-tool
eth0: 1 000 Mbit, full duplex, link ok

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