有时候，我们购买了5个IP，13个IP，难道都要一个一个的来写配置文件吗？Linux这么批量添加IP？Centos如何快速绑定多个IP？可否做到一个配置文件即可？可以！ 可用IP数查询

可以在/etc/sysconfig/network-scripts下创建一个range文件

比如，vi /etc/sysconfig/network-scripts/ifcfg-eth0-range0

DEVICE=eth0
BOOTPROTO=static
IPADDR_START=64.120.228.163
IPADDR_END=64.120.228.166
CLONENUM_START=8
NETMASK=255.255.255.248
ONBOOT=yes

CLONENUM_START — 网络克隆接口的启始号. # eg “1″  生成的网络接口会从 eth0:1开始。

然后重启网络让IP生效： service network restart

NETMASK 子网掩码 参考表：

/29 (5 usable) NETMASK = 255.255.255.248
/28 (13 usable) NETMASK = 255.255.255.240
/27 (29 usable) NETMASK = 255.255.255.224
/26 (61 usable) NETMASK = 255.255.255.192
/25 (125 usable) NETMASK = 255.255.255.128
/24 (253 usable) NETMASK = 255.255.255.0

IP段/28举例: 64.120.220.224/28   可用IP查询

The first two IPs (network & gateway) and the last IP (broadcast) in your assignment are unusable for you.

Network: 64.120.220.224
Gateway: 64.120.220.225
Broadcast: 64.120.220.239
Useable IPs: 64.120.220.226-238 (13 useable)

NETMASK = 255.255.255.240