一、Linux虚拟机克隆后，启动系统发现网卡无法启动，然后ifup eth0网卡会提示（Device eth0 does not seem to be present, delaying initialization.）失败。
二、处理方法：
方法一：
1、[root@yum ~]# vim /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.
# PCI device 0×1022:0×2000 (pcnet32)
SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”,
ATTR{address}==”08:00:27:7e:8c:e7″, ATTR{type}==”1″, KERNEL==”eth*”,
NAME=”eth0″
# PCI device 0×1022:0×2000 (pcnet32)
SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”,
ATTR{address}==”08:00:27:30:c2:57″, ATTR{type}==”1″, KERNEL==”eth*”,
NAME=”eth1″
记录下，eth1网卡的mac地址08:00:27:30:c2:57
接下来，打开/etc/sysconfig/network-scripts/ifcfg-eth0
2、[root@yum ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
将 DEVICE=”eth0″ 改成 DEVICE=”eth1″ ,
将
HWADDR=”08:00:27:7e:8c:e7″ 改成上面的mac地址 HWADDR=”08:00:27:30:c2:57″
3、# ifdown eth0 && ifup eth0 或者# /etc/init.d/network restart 或service network restart
方法二：
1、删除(/etc/sysconfig/network-scripts/ifcfg-eth0)网卡MAC地址行(HWADDR=)数据。
2、最后重启操作系统后正常。查看（ifconfig）是否正常。（不推荐该方法）
原文：http://www.cnblogs.com/zksfyz/p/5453911.html