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Original author(s) David S. Miller
Developer(s) Ben Hutchings
Initial release 1998; 16 years ago (1998)
Stable release 3.16.3 (17 September 2014; 14 days ago (2014-09-17)) [±][1]
Written in C
Operating system Linux kernel
Type utility program
License GNU General Public License v2

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.


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


To display the current parameters:

$ 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

See also[edit]


  1. ^ Torvalds, Linus (September 17 2014). "Linux 3.16.3". linux-kernel-mailing-list mailing list.