法一

[root@b ~]# vim /etc/sysconfig/network-scripts/ifcfg-eno16777736
TYPE=Ethernet
BOOTPROTO=none  （DHCP）
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPADDR=192.168.252.20
PREFIX=24
GATEWAY=192.168.252.1
DNS1=114.114.114.114
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=098d7152-c8db-44b6-9306-6cb426b1539d
DEVICE=eno16777736
ONBOOT=yes    //开机自动连接，不用client
[root@b ~]# nmcli connection up eno16777736     //启用

法二

[root@b ~]# nmcli connection edit  eno16777736 
nmcli ipv4> set method manual
nmcli ipv4> set addresses 192.168.252.191/24
nmcli ipv4> set gateway 192.168.252.1
nmcli ipv4> set dns 114.114.114.114
nmcli ipv4> save
Connection 'eno16777736' (098d7152-c8db-44b6-9306-6cb426b1539d) successfully updated.
nmcli ipv4> quit

法三

3.设置多会话的网络

      添加会话

[root@localhost~]# nmcli connection add type ethernet con-name home ifname eno16777736

[root@localhost~]# nmcli connection add type ethernet con-name work ifname eno16777736

         设置 ip 地址信息
     nmcli  connection modify home ipv4.addresses "172.16.40.1/24 "

            更改 ip 地址获取方式(静态)
    nmcli connection modify home ipv4.method manual

            Dhcp方式设置
 nmcli    connection modify work ipv4.method auto 

            启用某个会话
  #nmcli   con up work        
  法四

[root@b ~]# nmcli  connection modify eno16777736 ipv4.addresses 192.168.252.177/24   ipv4.gateway 192.168.252.1 ipv4.dns 114.114.114.114 connection.autoconnect yes
[root@b ~]# nmcli  connection up eno16777736