cmdref.net is command references/cheat sheets/examples for system engineers.
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ethtool - Display or change ethernet card settings
ethtool -s devname [speed N] [duplex half|full] [port tp|aui|bnc|mii] [mdix auto|on|off] [autoneg on|off]
[advertise N] [phyad N] [xcvr internal|external] [wol p|u|m|b|a|g|s|d...] [sopass xx:yy:zz:aa:bb:cc]
[msglvl N | msglvl type on|off ...]
-i --driver
queries the specified ethernet device for associated driver information.
-k --show-offload
queries the specified ethernet device for offload information.
# ethtool eth3
Settings for eth3:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
Link detected: yes
ethtool -s devname [speed N] [duplex half|full] [port tp|aui|bnc|mii] [mdix auto|on|off] [autoneg on|off]
[advertise N] [phyad N] [xcvr internal|external] [wol p|u|m|b|a|g|s|d...] [sopass xx:yy:zz:aa:bb:cc]
[msglvl N | msglvl type on|off ...]
ethtool -s eth0 speed 100 duplex full autoneg off ethtool -s eth0 autoneg on
-i --driver
Queries the specified network device for associated driver information.
# ethtool -i eth3 driver: tg3 version: 3.119 firmware-version: 5715s-v3.28 bus-info: 0000:07:04.1
-k --show-features --show-offload
Queries the specified network device for the state of protocol offload and other features.
# ethtool -k eth3 Offload parameters for eth3: Cannot get device udp large send offload settings: Operation not supported rx-checksumming: on tx-checksumming: on scatter-gather: on tcp segmentation offload: on udp fragmentation offload: off generic segmentation offload: off generic-receive-offload: off