批量添加IP：
在/etc/sysconfig/network-scripts下创建一个range文件

nano /etc/sysconfig/network-scripts/ifcfg-eth0-range0

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=static

IPADDR_START=192.168.2.2 
 
#起始IP

IPADDR_END=192.168.2.254
  
#结束IP

CLONENUM_START=1
          
#表示这段IP网卡号从eth0:1开始

NETMASK=255.255.255.0

无类域间路由(CIDR)的子网掩码设置参考：
/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