linux常识：管理IP地址

方法一：使用命令ifconfig

ifconfig 网络设备 IP地址 hw MAC地址 netmask 掩码地址 broadcast 广播地址 [up/down]

//网卡关闭与激活

# ifconfig eth0 down

# ifconfig eth0 up

# ifdown eth0

# ifup eth1

//查看网卡信息

# ifconfig [-a]

# ifconfig eth0

//设置IP信息

# ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx

# ifconfig eth0 192.168.10.110 netmask 255.255.255.0 mtu 1412 up

# ifconfig eth1 192.168.10.221 netmask 255.255.255.0 broadcast 192.168.10.255 up

# ifconfig eth1 192.168.10.221 hw ether xx:xx:xx:xx:xx:xx netmask 255.255.255.0 broadcast 192.168.10.255 mtu 1412 up

//添加虚拟网卡

# ifconfig eth0 192.168.10.110 hw ether xx:xx:xx:xx:xx:xx netmask 255.255.255.0 up

方法二：使用命令ip address

//查看ip状态

# ip address show

# ip address show dev eth0

//添加ip地址

# ip address add 192.168.10.110/24 brd + dev eth0

# ip address add 192.168.10.221/24 brd + dev eth0 label eth0:0

//删除ip地址

# ip address del 192.168.10.110/24 brd + dev eth0

//清空ip设置

# ip address flush dev eth0

# ip address show dev eth0

//此状态下ifconfig无法查看到第二IP

# ip address add 192.168.10.110/24 brd + dev eth0

# ip address add 192.168.10.221/24 brd + dev eth0

# ip address show dev eth0

2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100

link/ether 00:80:c8:f8:4a:51 brd ff:ff:ff:ff:ff:ff

inet 192.168.10.110/24 brd 192.168.10.255 scope global eth0

inet 192.168.10.221/24 brd 192.168.10.255 scope global secondary eth0

//此状态下ifconfig可以查看到第二IP

# ip address add 192.168.10.110/24 brd + dev eth0

# ip address add 192.168.10.221/24 brd + dev eth0:0

# ip address show dev eth0

2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100

link/ether 00:80:c8:f8:4a:51 brd ff:ff:ff:ff:ff:ff

inet 192.168.10.110/24 brd 192.168.10.255 scope global eth0

inet 192.168.10.221/24 brd 192.168.10.255 scope global secondary eth0:0

注意问题：

ifconfig和ip address添加的IP重启后都会失效，可通过修改/etc/sysconfig/network-scripts/ifcfg-eth0，/etc/sysconfig/network-scripts/ifcfg-eth0:0设置固定IP。

参考链接：

http://linux-ip.net/html/tools-ifconfig.html

http://linux-ip.net/html/tools-ip-address.html