Editing Ethtool

<code>ethtool</code><ref>http://man7.org/linux/man-pages/man8/ethtool.8.html</ref> command is used to view and modify network device drivers setting, in particular wired [[Ethernet]] devices.

* <code>[[ethtool --help]]</code>
* <code>ethtool [[eno]]1</code>
* <code>[[ethtool eth0]]</code>
* <code>ethtool -i eno1</code>
* <code>[[ethtool -S]] eno1</code>
* <code>[[ethtool -X]]</code>

 ethtool -i eth2
 driver: eth2
 version: 2.0
 firmware-version: N/A
 bus-info: N/A

 [[ethtool -S eno1]]  --statistics


 ethtool -K eth0 [[gso]] off [[gro]] off [[tso]] off


 ethtool -K eth0 gso on gro on tso on
 Actual changes:
 generic-segmentation-offload: on
 [[generic-receive-offload]]: on


 ethtool -K eno1 tx on rx on
 Actual changes:
 rx-checksumming: on
 tx-checksumming: on
 	tx-checksum-ip-generic: on
 tcp-segmentation-offload: on 
 	tx-tcp-segmentation: on 
	tx-tcp-mangleid-segmentation: on
	tx-tcp6-segmentation: on


* Disable [[TCP checksum]] offloading
 ethtool -K eth0 tx off rx off


* <code>[[ethtool --show-offload]] eno0</code>

== Examples ==

* <code>ethtool [[eno]]1</code>
 
  Settings for eno1:
  	Supported ports: [ TP ]
 	Supported link modes:   10baseT/Half 10baseT/Full
 	                        100baseT/Half 100baseT/Full
 	                        1000baseT/Half 1000baseT/Full
 	Supported pause frame use: No
 	Supports auto-negotiation: Yes
 	Supported FEC modes: Not reported
 	Advertised link modes:  10baseT/Half 10baseT/Full
 	                        100baseT/Half 100baseT/Full
 	                        1000baseT/Half 1000baseT/Full
 	Advertised pause frame use: Symmetric
 	Advertised auto-negotiation: Yes
 	Advertised FEC modes: Not reported
 	Link partner advertised link modes:  10baseT/Half 10baseT/Full
 	                                     100baseT/Half 100baseT/Full
 	                                     1000baseT/Full
 	Link partner advertised pause frame use: No
 	Link partner advertised auto-negotiation: Yes
 	Link partner advertised FEC modes: Not reported
 	Speed: 1000Mb/s
 	Duplex: Full
 	Port: Twisted Pair
 	PHYAD: 4
 	Transceiver: internal
	Auto-negotiation: on
 	MDI-X: off
 	Supports Wake-on: g
 	Wake-on: g
 	Current message level: 0x000000ff (255)
 			       drv probe link timer ifdown ifup rx_err tx_err
         Link detected: yes


ethtool eno1
Settings for eno1:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: off (auto)
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000007 (7)
			       drv probe link
	Link detected: yes
</pre>

<pre>
ethtool ens3f1
Settings for ens3f1:
	Supported ports: [ ]
	Supported link modes:   1000baseT/Full
	                        1000baseKX/Full
	                        10000baseT/Full
	                        1000baseX/Full
	                        10000baseSR/Full
	                        10000baseLR/Full
	Supported pause frame use: Symmetric
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  1000baseT/Full
	                        1000baseKX/Full
	                        10000baseT/Full
	                        1000baseX/Full
	                        10000baseSR/Full
	                        10000baseLR/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: Other
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: off
	Supports Wake-on: d
	Wake-on: d
	Current message level: 0x00000007 (7)
			       drv probe link
	Link detected: no
</pre>

 ethtool -i eno1
 driver: e1000e
 version: 3.2.6-k
 firmware-version: 0.5-4
 expansion-rom-version:
 bus-info: 0000:00:1f.6
 supports-statistics: yes
 supports-test: yes
 supports-eeprom-access: yes
 supports-register-dump: yes
 supports-priv-flags: no


 ethtool eth2
 Settings for eth2:
 	Supported ports: [ [[MII]] ]
 	Supported link modes:
 	Supports auto-negotiation: No
 	Advertised link modes:  Not reported
 	Advertised pause frame use: No
 	Advertised auto-negotiation: No
 	Speed: 1000Mb/s
 	Duplex: Full
 	Port: MII
 	PHYAD: 0
 	Transceiver: external
 	Auto-negotiation: off
 	Current message level: 0x00000236 (566)
 			       probe link ifdown ifup intr
 	Link detected: yes


 ethtool [[enx]]0t6b8f279a99
 Settings for enx0t6b8f279a99:
        Current message level: 0x00000007 (7)
                               drv probe link
 	Link detected: yes

== Related terms ==
* <code>[[ip link set]] eth0 up</code>
* [[TCP Segmentation Offload (TSO)]]
* [[Generic Segmentation Offload (GSO)]]
* [[Generic Receive Offload (GRO)]]

== See also ==
* {{ethtool}}
* {{LSO}}
* {{Linux ethernet}}
* {{ethernet}}

[[Category:networking]]