em1를 eth0으로 이름 변경

# rpm -qa | grep biosdevname

biosdevname-0.5.0-2.fc20.x86_64

# rpm -e biosdevname

# cd /etc/sysconfig/network-scripts/

# mv ifcfg-em2 ifcfg-eth0

# vi ifcfg-eth0

#DEVICE=em2

to

DEVICE=eth0

#NAME=em1

to

NAME=eth0

# reboot