网络错误问题:RTNETLINK answers: File exists

错误贴上：
[root@localhost network-scripts]# systemctl restart network
Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.
[root@localhost network-scripts]# systemctl status network.service
● network.service - LSB: Bring up/down networkingLoaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)Active: failed (Result: exit-code) since Tue 2020-08-18 09:43:34 HKT; 11s agoDocs: man:systemd-sysv-generator(8)Process: 6278 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)Tasks: 1Memory: 11.3MCGroup: /system.slice/network.service└─856 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient-98230ece-15b5-4d6f-8cba-7d406604929f-enp0s3.lease -pf /var/run/dhclient-enp0s3.pid enp0...Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain network[6278]: RTNETLINK answers: File exists
Aug 18 09:43:34 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1
Aug 18 09:43:34 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking.
Aug 18 09:43:34 localhost.localdomain systemd[1]: Unit network.service entered failed state.
Aug 18 09:43:34 localhost.localdomain systemd[1]: network.service failed.
[root@localhost network-scripts]# cd /etc/udev/rules.d/70-persistent-net.rules
-bash: cd: /etc/udev/rules.d/70-persistent-net.rules: No such file or directory

开始找了很多方法，什么修改mac地址，关闭NetworkManager 都没用

解决办法：NetworkManager 和重启网络直接解决

//先关闭NetworkManager
service NetworkManager off
service NetworkManager stop
//关闭一下网卡
ifdown enp0s3  //enp0s3是我的网卡名字，文件名称ifcfg-enp0s3,ifdown表示禁用该网络:
//之后重启网络
systemctl restart network

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网络错误问题:RTNETLINK answers: File exists

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