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# 顯示所有網路卡設定 (network manageer cli connection)
$ nmcli con show
# NAME  UUID                                  TYPE            DEVICE
# eth0  505a7445-2aac-45c8-92df-dc10317cec22  802-3-ethernet  eth0

# 新增網卡設定 網卡類型: 乙太網卡 網卡代號: 預設網卡(虛擬機只有 eth0) 連線代號: mylan
$ nmcli con add type ethernet ifname enp0s3 con-name mylan

$ cd /etc/sysconfig/network-scripts/
$ ls
$ nmcli con show
$ vim ifcfg-enp0s3
$ systemctl start network

# 觀察網路介面的參數
$ ifconfig # CentOS 6
$ ip addr # CentOS 7

ifcfg-enp0s3

1 TYPE=Ethernet
2 PROXY_METHOD=none
3 BROWSER_ONLY=no
4 BOOTPROTO=dhcp
5 DEFROUTE=yes
6 IPV4_FAILURE_FATAL=no
7 IPV6INIT=yes
8 IPV6_AUTOCONF=yes
9 IPV6_DEFROUTE=yes
10 IPV6_FAILURE_FATAL=no
11 IPV6_ADDR_GEN_MODE=stable-privacy
12 NAME=enp0s3
13 UUID=6bce9713-c7be-4a32-a2c6-f7e12a0fbaf1
14 DEVICE=enp0s3
15 ONBOOT=no
16 ZONE=