nmcli nmtui systemctl restart NetworkManager

By OK -
!part_command = run last command

 [root@localhost ~]# nmcli connection show 
NAME   UUID                                  TYPE            DEVICE 
ens33  80d3cc7f-4474-4a88-b534-679859a360ca  802-3-ethernet  ens33  

 [root@localhost ~]# ls /etc/sysconfig/network-scripts/
ifcfg-ens33  ifdown-isdn      ifup          ifup-plip      ifup-tunnel
ifcfg-lo     ifdown-post      ifup-aliases  ifup-plusb     ifup-wireless
ifdown       ifdown-ppp       ifup-bnep     ifup-post      init.ipv6-global

 let's add new connection

 [root@localhost ~]# nmcli connection add con-name test ifname ens33 type ethernet ip4 10.0.0.15/24
Connection 'test' (d9819184-7f5f-4880-b7f6-75ccd7739e62) successfully added.
[root@localhost ~]# nmcli connection show NAME   UUID                                  TYPE            DEVICE 
ens33  80d3cc7f-4474-4a88-b534-679859a360ca  802-3-ethernet  ens33  
test   d9819184-7f5f-4880-b7f6-75ccd7739e62  802-3-ethernet  --     

 nmcli conn down ens33 

nmcli conn up test

[root@localhost ~]# !ip
ip a show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:17:b4:58 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.15/24 brd 10.0.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::ccb5:1d23:1a98:e42f/64 scope link 
       valid_lft forever preferred_lft forever

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-test 
TYPE=Ethernet
BOOTPROTO=none
IPADDR=10.0.0.15
PREFIX=24
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=test
UUID=d9819184-7f5f-4880-b7f6-75ccd7739e62
DEVICE=ens33
ONBOOT=yes

after changes in nmtui - run
systemctl restart NetworkManager



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