Ubuntu

# 先查看动态IP时的网络参数
ip addr
# 修改配置文件，配置静态IP
vim /etc/netplan/01-netcfg.yaml

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    eth0:
      dhcp4: no
      addresses: [192.168.12.18/24]
      gateway4: 192.168.12.1
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]

1. network命令
#service network restart
或者
# /etc/init.d/networking restart

2. ifdown/ifup命令
# ifdown eth0 关闭
# ifup eth0 开启

3. ifconfig命令
# ifconfig eth0 down 关闭
# ifconfig eth0 up 开启