1. In /etc/udev/rules.d/70-persistent-net.rules, disable the old eth0 NIC
nano /etc/udev/rules.d/70-persistent-net.rules
1.1 Comment out line
#SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:9b:62:83", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
1.2 Change "eth1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:9e:42:91", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
to "eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:9e:42:91", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"