補足説明：
OSをRebootした際、NICが無効状態でOS起動→有効状態でOS起動するよう変更。
OS:Linux_CentOS7
[root@cent ~]# cd /etc/sysconfig//network-scripts/
[root@cent network-scripts]#
[root@cent network-scripts]#
[root@cent network-scripts]# ls
ifcfg-enp0s3 ifdown-bnep ifdown-post ifup ifup-eth ifup-plusb ifup-tunnel
ifcfg-lo ifdown-eth ifdown-ppp ifup-Team ifup-ippp ifup-post ifup-wireless
ifdown ifdown-ippp ifdown-routes ifup-TeamPort ifup-ipv6 ifup-ppp init.ipv6-global
ifdown-Team ifdown-ipv6 ifdown-sit ifup-aliases ifup-isdn ifup-routes network-functions
ifdown-TeamPort ifdown-isdn ifdown-tunnel ifup-bnep ifup-plip ifup-sit network-functions-ipv6
[root@cent network-scripts]#
[root@cent network-scripts]#
[root@cent network-scripts]# cat ifcfg-enp0s3
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=EthBrige
UUID=a88142af-a232-4de3-8b5d-484ca2159df7
DEVICE=enp0s3
ONBOOT=no
IPADDR0=192.168.1.12
PREFIX0=24
GATEWAY0=192.168.1.1
IPV6_PRIVACY=no
DNS1=192.168.1.1
[root@cent network-scripts]#
[root@cent network-scripts]#
[root@cent network-scripts]# vi ifcfg-enp0s3
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=EthBrige
UUID=a88142af-a232-4de3-8b5d-484ca2159df7
DEVICE=enp0s3
ONBOOT=yes
IPADDR0=192.168.1.12
PREFIX0=24
GATEWAY0=192.168.1.1
IPV6_PRIVACY=no
DNS1=192.168.1.1
[root@cent network-scripts]#
