What is the relationship between eth0 and en0?

what is the relationship between eth0 and en0?

under my / etc/sysconfig/network-scripts/ , there are ifcfg-en0 and ifcfg-eth0 : 

[root@localhost /]-sharp 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

what is the relationship between en0 and eth0 ?

Linux centos computer-network
Jul.14,2021

That's a change in how now udevd assigns names to ethernet devices. Now your devices use the "Predictable Interface Names", which are based on (and quoting the sources):

  1. Names incorporating Firmware/BIOS provided index numbers for on-board devices (example: eno1)
  2. Names incorporating Firmware/BIOS provided PCI Express hotplug slot index numbers (example: ens1)
  3. Names incorporating physical/geographical location of the connector of the hardware (example: enp2s0)
  4. Names incorporating the interfaces's MAC address (example: enx78e7d1ea46da)
  5. Classic, unpredictable kernel-native ethX naming (example: eth0)

The why's this changed is documented in the systemd freedesktop.org page, along with the method to disable this: 

ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules

or if you use older versions: 

ln -s /dev/null /etc/udev/rules.d/80-net-name-slot.rules

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