You may noticed that network cards in new Linux have a new naming schema that will looks like eno1236558 or ens 3365777 , and you may don’t feel comfortable with that, the good news that you can get back old naming to eth0 , eth1 , … , let’s do it.
01. Edit grub default values :
add the this tow values [ biosdevnames=0 net.ifnames=0 ] to the line that start with GRUB_CMDLINE_LINUX , it will be something like that in UBUNTU (on CentOS it may have many options, add values near the end or whatever ) :
02. Test changes :
If no errors , it is OK , let’s make it persistent .
03. Make changes persistent :
grub2-mkconfig -o /boot/grub2/grub.cfg
** you may also need to remove default config files for old names in CentOS before reboot.
rm -f /etc/sysconfig/network-scripts/ifcfg-eno*
04. Test :
ifconfig ip addr
The NIC interfaces names changed to eth0 , eth1 , … based on how many interface on your system .