systemctl list-unit-files --type=service | grep net
inetd.service enabled
network-manager.service disabled
networkd-dispatcher.service disabled
networking.service enabled
ntp-systemd-netif.service static
openbsd-inetd.service enabled
systemd-networkd-wait-online.service disabled
systemd-networkd.service disabled
使用interfaces方式，关闭除networking之外的网络管理模式。