今天早上打开xshell链接虚拟机，突然链接不上。然后进入虚拟机执行 ifconfig 或者 ip addr list 命令发现eth0 不见。然后执行重启网卡命令发现 
解决办法： 首先，打开/etc/udev/rules.d/70-persistent-net.rules内容如下面例子所示：
# vi /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 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:8f:89:9
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:50:bd:1
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"记录下，eth1网卡的mac地址00:0c:29:50:bd:17 接下来，打开/etc/sysconfig/network-scripts/ifcfg-eth0
# vi /etc/sysconfig/network-scripts/ifcfg-eth0 将 DEVICE="eth0" 改成 DEVICE="eth1" , 将 HWADDR="00:0c:29:8f:89:97" 改成上面的mac地址 HWADDR="00:0c:29:50:bd:17" 最后，重启网络 # service network restart 或者 # /etc/init.d/network restart
然后瞬间就满血复活，xshell链接也正常了。
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CentOS Linux解决Device eth0 does not seem to be present
原文：http://11549909.blog.51cto.com/11539909/1832274