ethtool

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ethtool
Original author(s)David S. Miller
Developer(s)Ben Hutchings
Initial release1998; 20 years ago (1998)
Repository Edit this at Wikidata
Written inC
Operating systemLinux
TypeUtility program
LicenseGNU GPL v2
Websitewww.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[edit]

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[edit]

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

See also[edit]

References[edit]

External links[edit]