What's the difference between `en0` and `eth0`?
I see your edit, but the comment is correct... It is the same mechanism referenced.
It's the concept of biosdevnames / consistent device naming.
In RHEL6/CentOS 6 there was an attempt to work around this via a special udev rule:
/etc/udev/rules.d/70-persistent-net.rules
Within that file you will see a mapping (by mac address) attempting to provide consistent names, but not in the way mentioned in the consistent device naming article linked above.
The most common case I experienced this was when users would clone a VM. This would change the mac address of the VM and then that UDEV rule would present the new mac address as a new device, effectively locking the old device in as eth0
.
To determine the file you should use, check the name mapped in /etc/udev/rules.d/70-persistent-net.rules
by the mac address of the VMs network adapter. Using that file, you can map it to anything you like. Once you know the name, use the corresponding file in /etc/sysconfig/network-scripts
.
After UDEV rule changes, reload them with:
sudo udevadm control -R
After that you can manually trigger processing of the rules with:
sudo udevadm trigger
In the long run you should clear any unwanted rules from /etc/udev/rules.d/70-persistent-net.rules
.
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fanhualuojin154873
Updated on September 18, 2022Comments
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fanhualuojin154873 over 1 year
What's the difference between
en0
andeth0
?In my CentOS 6 VM, there is list of network-scripts:
[root@localhost /]# ls /etc/sysconfig/network-scripts/ ifcfg-en0 ifdown-ipv6 ifup ifup-plip ifup-wireless ifcfg-eth0 ifdown-isdn ifup-aliases ifup-plusb init.ipv6-global ifcfg-lo ifdown-post ifup-bnep ifup-post net.hotplug ifdown ifdown-ppp ifup-eth ifup-ppp network-functions ifdown-bnep ifdown-routes ifup-ippp ifup-routes network-functions-ipv6 ifdown-eth ifdown-sit ifup-ipv6 ifup-sit ifdown-ippp ifdown-tunnel ifup-isdn ifup-tunnel
you see there are
ifcfg-en0
andifcfg-eth0
, does it have any difference between them? theifcfg-eth0
I have used(configured data in it), now I want to add a more IP address, which file I can configured?
EDIT-01
The enoX and the ethX is not related to my post, mine is
enX
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Admin over 5 yearsSimilar on Super User: What is the difference between eth1 and eno1?
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muru over 5 yearsCheck the output of
ifconfig -a
orip link show
to see which interface name you have and use it. -
telcoM over 5 years
ethtool -i en0
andethtool -i eth0
might provide useful information too (the PCI device ID and the name of the driver responsible for the NIC).
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fanhualuojin154873 over 5 yearsdo you mean, there is no other difference except the interface name?
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Prabhin over 5 years