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
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