Mii-tool command

From NetworkCommands

A command line program available on most Linux platforms; used to configure and monitor Ethernet interface speed, duplex and auto-negotiation.

Usage Syntax

mii-tool [options] interface

Common options include;

-v - display verbose information
-r - restart autonegotiation
-R - reset interface to it's default mii configuration
-w - watch link status and report changes. The interface is polled every second
-F media - force or hard-code the link to use the speed and duplex specified by media

Valid parameters for media are;

100baseTx-FD - 100Mb Speed, Full Duplex
100baseTx-HD - 100Mb Speed, Half Duplex
10baseT-FD - 10Mb Speed, Full Duplex
10baseT-HD - 10Mb Speed, Half Duplex

Usage Examples

mii-tool eth0 - display basic mii information; auto-negotiation, speed, duplex and link status for interface eth0

mii-tool -v eth0 - display verbose information including mii capabilities and advertised media

mii-tool -F 100baseTx-HD eth0 - force interface eth0 to 100Mb, Full Duplex

Usage Notes

Change made with this command are not persistent and do not survive a reboot/restart. To ensure persistence, add commands as necessary to your system's /etc/rc.local startup script.

Linux Usage Notes

With most Linux or Unix commands;

Brief help can be displayed using the option/keyword: -h or --help, for example: chmod --help
A full command manual can be displayed using the man command followed by the command name, for example: man chmod
Sometimes 'info' pages are used instead of or to provide more information than man pages; for example: info chmod
Version information can be display using the option/keyword: -v or --version, for example: chmod --version