Knowledge Check Question 3.1
Why is IP the only correct answer when in the Layer 2: Configuration section they use ifconfig, ip and ethtool to alter L2 configuration of an adapter?
Comments
-
This is still an issue in December 2020.
Examples are given under "Layer 2 configuration" using
ifconfig
&ip
to set MTU andethtool
to set link speed, yet onlyip
is considered a correct answer.Layer 2: Configuration
The following commands are used to change the maximum transmission unit (MTU):
# ifconfig eth0 mtu 1492
# ip link set mtu 1492 dev eth0
The following command is used to change the link speed:
# ethtool -s eth0 speed 1000 duplex full
1 -
This is still an issue in the end of 2020.
You can also change an interface MAC address with both ifconfig and ethtool and this is obviously a Layer 2 operation.
It's really straightforward with ipconfig like
# ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
It's more tricky with ethtool because you'll have to mangle with EEPROM but it's still feasible.
Google just found me a good write-up about it here: https://blog.kanbach.org/post/how-to-permanently-change-a-mac-address-using-ethtool/0 -
Hello, eg15,RonaldBarnes and timothyaw,
Two items today:
First, all occurrences of the "ifconfig" command have been eradicated from the material.
The second part is the question 3.1, it has also been removed.Without starting a flame war, ifconfig is dead, let me quote the man page:
"Note:
This program is obsolete! For replacement check ip addr and ip link. For statistics use ip -s link.:The question was removed because "can" do something vs "should" do something made it a poor question. The number of methods to change the IP addresses, MAC addresses and ip parameters is actually quite a long list and declaring one method to be "best" is problematic.
Regards, Lee
1
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