How To Fix “Device eth0 does not seem to be present, delaying initialization” Error!!

Try to start Eth0 device:
# ifup eth0
Device eth0 does not seem to be present, delaying initialisation

First step – check the MAC Addresses are set correctly:-
[root@centOS network-scripts]#    cat ifcfg-eth0 | grep HWA

HWADDR=”08:00:27:FC:73:2A”

[root@centOS network-scripts]#    cat ifcfg-eth1 | grep HWA

HWADDR=”08:00:27:09:E1:75?

[root@centOS network-scripts]#    cat ifcfg-eth2 | grep HWA

HWADDR=”08:00:27:31:2D:D6?

[root@centOS network-scripts]# ip -o link

1: lo: mtu 16436 qdisc noqueue state   UNKNOWN \    link/loopback   00:00:00:00:00:00 brd 00:00:00:00:00:00

2: eth0: mtu 1500 qdisc   pfifo_fast state UP qlen 1000\      link/ether 08:00:27:fc:73:2a brd ff:ff:ff:ff:ff:ff

3: eth8: mtu 1500 qdisc   pfifo_fast state UP qlen 1000\      link/ether 08:00:27:09:e1:75 brd ff:ff:ff:ff:ff:ff

4: eth2: mtu 1500 qdisc   pfifo_fast state UP qlen 1000\      link/ether 08:00:27:31:2d:d6 brd ff:ff:ff:ff:ff:ff

Theres no eth1 but there is an eth8. Lets check what is there in dmesg:
root@centOS network-scripts]# dmesg | grep eth1

e1000 0000:00:08.0: eth1: (PCI:33MHz:32-bit) 08:00:27:09:e1:75

e1000 0000:00:08.0: eth1: Intel(R) PRO/1000 Network Connection

udev: renamed network interface eth1 to eth8.

So udev decided to rename my interface, Why is this? A little look at /etc/udev/rules.d/70-persistent-net.rules revealed the answer:-
[root@centOS ~]# cat /etc/udev/rules.d/70-persistent-net.rules |   grep “08:00:27:09:e1:75?

SUBSYSTEM==”net”, ACTION==”add”,   DRIVERS==”?*”, ATTR{address}==”08:00:27:09:e1:75?,   ATTR{dev_id}==”0x0?, ATTR{type}==”1?,   KERNEL==”eth*”, NAME=”eth1?

SUBSYSTEM==”net”, ACTION==”add”,   DRIVERS==”?*”, ATTR{address}==”08:00:27:09:e1:75?,   ATTR{dev_id}==”0x0?, ATTR{type}==”1?,   KERNEL==”eth*”, NAME=”eth8?

Looks like there are mulitple entries for the same MAC address. Removed the incorrect entry and restart the interface using below command.
# ifup eth0
Thats it..