linux单网卡配置多IP
1、通过复制一个ifcfg-eth0:1配置文件实现：

cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:1

vi /etc/sysconfig/network-scripts/ifcfg-eth0:1

# Intel Corporation 82566DC Gigabit Network Connection
DEVICE=eth0
BOOTPROTO=none
BROADCAST=218.95.37.255
HWADDR=00:19:d1:34:2d:b8
IPADDR=218.95.37.250
NETMASK=255.255.255.192
NETWORK=218.95.37.192
ONBOOT=yes
GATEWAY=218.95.37.193
TYPE=Ethernet

ifconfig eht0:1 up


2、临时方式(重启后就丢失了):

ifconfig eth0:1 192.168.0.2 netmask 255.255.255.0 up


3、脚本方式实现：

#!/bin/sh

eth01=/etc/sysconfig/network-scripts/ifcfg-eth0:1

touch $eth01

echo DEVICE=eth0:1>>$eth01
echo BOOTPROTO=none>>$eth01
echo IPADDR=192.168.40.76>>$eth01
echo NETMASK=255.255.255.0>>$eth01
echo ONBOOT=yes>>$eth01

/etc/init.d/network restart