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How to setup network after RHEL/CentOS 7 minimal installation
After installing RHEL/CentOS 7 minimal, You may not able to connect network in that machine. This will happen because Ethernet interfaces are not enabled by default.

#list ethernet card installed on your machine
type: nmcli d


Type “nmtui” command in your terminal to open Network manager
After opening Network manager chose “Edit connection” and press Enter (Use TAB button for choosing options).
Now choose you network interfaces and click “Edit”

Choose “Automatic” in IPv4 CONFIGURATION and check Automatically connect check box and press OK and quit from Network manager.

#Reset network services:
service network restart

DONE