Make your lan connections eth0,eth1 from ens33 etc in CentOS 7

yum -y install ftp nano net-tools #(net-tools for ifconfig)

go to /etc/hostname

server1.sourav.com

go to /etc/hosts

the file is like this

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6


make it look like

127.0.0.1  server1.sourav.com localhost localhost.localdomain localhost4 localhost4.localdomain4
::1       server1.sourav.com  localhost localhost.localdomain localhost6 localhost6.localdomain6


now ifconfig command shows the interface as ens33,I want to make the two lan adapter as eth0 and eth1

nano /etc/default/grub

find this line

GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us rhgb quiet"

and make it look like that

GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us rhgb quiet net.ifnames=0 biosdevname=0"

save and exit

reboot


ifconfig eth0 down

ifconfig eth1 down

and

ifconfig eth0 up

will do the managing for you


run this command

grub2-mkconfig -o /boot/grub2/grub.cfg

reboot

run ifconfig

you will see the network adapters as eth0 and eth1

cd /etc/sysconfig/network-scripts/

mv ifcfg-ens33 ifcfg-eth0

nano ifcfg-eth1

DEVICE="eth1"

NAME="eth1"

IPADDR=10.10.0.1

delete the gate way and dns

delete the uuid

get the proper mac address for ethernet adapter2

BOOTPROTO="static"

ONBOOT="yes"

Del PEERROUTES,PEERDNS,DEFROUTE portions on eth1

save and exit


systemctl stop NetworkManager

systemctl disable NetworkManager

systemctl restart network

now you are fine

For more information 


http://unix.stackexchange.com/questions/81834/how-can-i-change-the-default-ens33-network-device-to-old-eth0-on-fedora-19