$ ls /etc/sysconfig/network-scripts/ifcfg-*
/etc/sysconfig/network-scripts/ifcfg-enp0s3  /etc/sysconfig/network-scripts/ifcfg-lo
$ sudo vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
------▼設定ファイルの中身▼-----------------------
BOOTPROTO=none
DEVICE=enp0s3
DNS=8.8.8.8 <<<<<<<<<<<<<< 追記
GATEWAY=192.168.0.1 <<<<<<< 追記
IPADDR=192.168.0.6
NAME=enp0s3
NETMASK=255.255.255.0
ONBOOT=yes
TYPE=Ethernet
--------------------------