[root@localhost ~]# systemctl status network.service

network.service - LSB: Bring up/down networking

?? Loaded: loaded (/etc/rc.d/init.d/network)

Active: failed (Result: exit-code) since?三?2014-11-05 15:30:10 CST; 1min 5s ago

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月?05 15:30:10 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1

11月?05 15:30:10 localhost.localdomain systemd[1]:?Failed to start LSB: Bring up/down networking.

11月?05 15:30:10 localhost.localdomain systemd[1]: Unit network.service entered failed state.

root@localhost ~]# ip addr

1: lo:

??? link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

??? inet 127.0.0.1/8 scope host lo

?????? valid_lft forever preferred_lft forever

??? inet6 ::1/128 scope host

?????? valid_lft forever preferred_lft forever

2: eno16777736:

??? link/ether?00:0f:19:10:12:f1?brd ff:ff:ff:ff:ff:ff

??? inet 192.168.38.135/24 brd 192.168.38.255 scope global dynamic eno16777736

?????? valid_lft 1681sec preferred_lft 1681sec

??? inet6 fe80::20c:11aa:ae11:4fe4/64 scope link

?????? valid_lft forever preferred_lft forever

注意上面加粗加紅的字，這就是新的mac地址。

接下來就剩下修改ifcfg-XXX文件了，只修改HWADDR就可以了。接下來執行service network restart?就正常了。