CentOS 配置网络连接（包括添加多个 IP 方法）
如果没有在 CentOS 安装过程中配置网络，之后需要手动修改网卡配置文件，设置静态 IP 地址和子网掩码（外网访问须同时设置网关和 DNS），相关信息可以从主机商处获取。下面介绍具体设置方法。
查看现有网卡信息
用ip address show命令列出现有网卡及其 IP。如果输出内容太多，可用ip address show | less分页查看。| 垂直线用 Shift + \ 组合键打出。less 用 Ctrl + F 和 Ctrl + B 前后翻页，q 退出。
也可以直接浏览查看网卡配置文件。
cd /etc/sysconfig/network-scripts && ls
示例输出，ifcfg-xxx就是网卡配置文件（ifcfg-lo 属于特殊用途网卡，通常不要修改它）。
CentOS7 和 CentOS6 的网卡命名方式有所不同，前者通常是ifcfg-enp0s3，后者是ifcfg-eth0（网卡名称后面的数字非固定，很多时候存在多个网卡接口）。
配置启用网络连接
编辑网卡配置文件（如果有多个，配置其中一个就行）。以下是设置静态 IP 需要修改或添加的内容（文件里的其它原有参数，例如 TYPE、HWADDR 等不要删除）。
DEVICE=eth0 # 网卡名称，保持默认 TYPE=Ethernet # 网卡类型（以太网） ONBOOT=yes # 启动时激活网络连接 BOOTPROTO=static # 设置使用静态 IP IPADDR=192.168.1.100 # 设置 IP 地址 GATEWAY=192.168.1.1 # 设置网关地址 NETMASK=255.255.255.0 # 设置子网掩码 DNS1=1.1.1.1 # 设置首选 DNS DNS2=1.0.0.1 # 设置备用 DNS IPV6INIT=no # 禁用 IPv6 NM_CONTROLLED=no # 禁用 NetworkManager 管理
延伸：如需了解有关子网掩码、网关的作用可看网上这篇介绍，总结的通俗明了。
设置后运行service network restart命令重启网络生效。之后用ifconfig检查 IP 绑定情况，其它计算机测试可以 ping 通 IP 就可以了。
网卡添加绑定多个 IP
如果要绑定多个 IP，可以添加多个 IPADDRx参数，尾数x是由 0 开始的连续整数。
IPADDR0=192.168.1.101 IPADDR1=192.168.1.103 IPADDR2=192.168.1.105
若要设置各 IP 使用不同的子网掩码，相应添加NETMASKx参数即可（尾数x的数字 ID 与对应 IP 的一致）。注意网关通常不要设置多个，不然会影响网络访问。
如果要添加一个范围内的 IP 地址，请查看这篇文章介绍。
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