CentOS单网卡绑定多个IP

设置方法如下：
cd /etc/sysconfig/network-scripts
cp ifcfg-eth0 ifcfg-eth0:1
vi ifcfg-eth0:1
然后改动相应的地方，一般有两个
1. device=eth0——–>device=eth0:1
2. IP地址

完成后 service network restart 就生效了

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