RHEL/CentOS 7 networking deprecated ifconfig

ifconfig networking command has been deprecated in RHEL 7.

Redhat suggest to use "ip" command instead of now legacy ifconfig or use a text user interface "nmtui" to control network manager.

After you have set ip/gateway/dns or dhcp setting in nmtui, you can restart the network as below:

# systemctl restart NetworkManager.service

# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:16:ae:0e brd ff:ff:ff:ff:ff:ff
    inet 10.8.8.238/24 brd 10.8.8.255 scope global dynamic eth0
       valid_lft 3576sec preferred_lft 3576sec
    inet6 fe80::5054:ff:fe16:ae0e/64 scope link 
       valid_lft forever preferred_lft forever