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read the transcript!
ethtool is for people who need to manage physical networks
server, represented by a sad rectangle: why no internet??
smiling stick figure with short curly hair: oops! it would help if you ethernet cable was plugged in!
ethtool eth0
(name of network interface)
this tells you:
- is it even connected? (“link detected”)
- speed
- lots more
--show-offload --offload
your network card can do a lot for you! Like computing checksums. This is called “offloading”. This lets you see/change configured offloads.
--identify INTERFACE
blink the light on the ethernet port. good if you have multiple ports! and cute. (heart)
-S INTERFACE
show statistics like bytes sent. works for wifi interfaces too.
-s
change speed/duplex/other settings of an interface.
$ ethtool - eth0 speed 100
-i INTERFACE
show firmware info
iw dev wlan0 link
ethtool is mostly for Ethernet.
To see the speed (and more) of a wireless connection, use iw.