MII-TOOL(8)
NAME
mii-tool - view, manipulate media-independent interface status
SYNOPSIS
mii-tool [-v, --verbose] [-V, --version] [-R, --reset] [-r, --restart] [-w, --watch] [-l, --log] [-A, --advertise=media,...] [-F, --force=media] [interface ...]
DESCRIPTION
This utility checks or sets the status of a network interface's Media
Independent Interface (MII) unit. Most fast ethernet adapters use an
MII to autonegotiate link speed and duplex setting.
Most intelligent network devices use an autonegotiation protocol to
communicate what media technologies they support, and then select the
fastest mutually supported media technology. The -A or --advertise
options can be used to tell the MII to only advertise a subset of its
capabilities. Some passive devices, such as single-speed hubs, are
unable to autonegotiate. To handle such devices, the MII protocol also
allows for establishing a link by simply detecting either a 10baseT or
100baseT link beat. The -F or --force options can be used to force the
MII to operate in one mode, instead of autonegotiating. The -A and -F
options are mutually exclusive.
The default short output reports the negotiated link speed and link
status for each interface. If an interface or interfaces are not specified on the command line, then mii-tool will check any available
interfaces from eth0 through eth7.
OPTIONS
- -v, --verbose
- Display more detailed MII status information. If used twice, also display raw MII register contents.
- -V, --version
- Display program version information.
- -R, --reset
- Reset the MII to its default configuration.
- -r, --restart
- Restart autonegotiation.
- -w, --watch
- Watch interface(s) and report changes in link status. The MII interfaces are polled at one second intervals.
- -l, --log
- Used with -w, records link status changes in the system log instead of printing on standard output.
- -F media, --force=media
- Disable autonegotiation, and force the MII to either 100baseTxFD, 100baseTx-HD, 10baseT-FD, or 10baseT-HD operation.
- -A media,..., --advertise=media,...
- Enable and restart autonegotiation, and advertise only the specified media technologies. Multiple technologies should be separated by commas. Valid media are 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, and 10baseT-HD.
DIAGNOSTICS
- SIOCGMIIPHY on 'eth?' failed: Invalid argument
- If the interface is not running (up), kernel will refuse to report its link state.
- SIOCGMIIPHY on 'eth?' failed: Operation not permitted
- Most kernels restrict access to root.
- SIOCGMIIPHY on 'eth?' failed: No such device
- This error is shown, if the kernel does not know about the named device.
- SIOCGMIIPHY on 'eth?' failed: Operation not supported
- The interface in question does not support MII queries. Most likely, it does not have MII transceivers, at all.
AUTHORS
- David Hinds - dhinds@pcmcia.sourceforge.org
Donald Becker - becker@scyld.com
Bernd Eckenfels - ecki@debian.org