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Short: The System remembers its old MAC address, remove it so it knows where to bind eth0 to.

sudo vim /etc/udev/rules.d/70-persistent-net.rules

remove "your old MAC addresses", and change your "new one" to eth0.

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:fb:d5:1e", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:fb:d5:1c", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

Source

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