Centos环境下将修改后的MAC地址永久保存的正确的步骤如下：
#ifconfig eth0 down
#vi /etc/sysconfig/network-scripts/ifcfg-eth0
修改其中的"HWADDR=xx:xx:xx:xx:xx:xx"为"MACADDR=xx:xx:xx:xx:xx:xx"
#ifconfig eth0 up
#systemctl start network
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