ethtool

ethtool
Original author(s)	David S. Miller
Developer(s)	Ben Hutchings
Initial release	1998 (1998)
Written in	C
Operating system	Linux
Type	Utility program
License	GNU GPL v2
Website	www.kernel.org/pub/software/network/ethtool/

ethtool is a utility for Linux kernel-based operating system for displaying and modifying some parameters of network interface controllers (NICs) and their device drivers. ethtool is developed parallel to the Linux kernel.

Usage

The command is useful for

Identification and diagnosis of Ethernet devices
Extended Ethernet devices statistics
Control speed, duplex, auto-negotiation and flow control for Ethernet devices
Control checksum offload and other hardware offload features
Control DMA ring sizes and interrupt moderation
Control receive queue selection for multiqueue devices
Upgrade firmware in flash memory

Examples

To display the current parameters of the first network port (eth0):

$ ethtool eth0
Settings for eth0:
       Supported ports: [ TP MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
       Supports auto-negotiation: Yes
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
       Advertised auto-negotiation: No
       Speed: 100Mb/s
       Duplex: Full
       Port: MII
       PHYAD: 1
       Transceiver: internal
       Auto-negotiation: off
       Supports Wake-on: g
       Wake-on: g
       Current message level: 0x00000007 (7)
       Link detected: yes

To force its speed and duplex, in 1000BASE-T:

$ ethtool -s eth0 speed 1000 duplex full autoneg off

External links

Unix command-line interface programs and shell builtins

File system	cat chmod chown chgrp cksum cmp cp dd du df file fsck fuser ln ls mkdir mount mv pax pwd rm rmdir split tee touch type umask

Processes	at bg chroot cron fg kill killall nice pgrep pkill ps pstree time top

User environment	clear env exit finger history logname mesg passwd su sudo uptime talk tput uname w wall who whoami write

Text processing	awk banner basename comm csplit cut diff dirname ed ex fmt fold head iconv join less more nl paste printf sed sort spell strings tail tr uniq vi wc xargs yes

Shell builtins	alias cd echo test unset wait

Networking	dig host ifconfig inetd netcat netstat nslookup ping rdate rlogin route ssh traceroute

Searching	find grep locate whatis whereis

Documentation	apropos help man

Miscellaneous	bc dc cal expr lp od sleep true and false

List of Unix commands

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ethtool

Usage

Examples

See also

External links