Linux system single NIC binding multiple IP addresses

Description

Single NIC binding two IP addresses, telecommunications and Unicom, the purpose: to be used when the telecom out of fault unicom normal use.

System	IP Address	Subnet mask	Gateway
CentOS 6.3_64bit	eth0:116.18.176.19	255.255.255.0	192.168.1.1
eth0:0:172.188.174.20	255.255.255.0	192.168.1.1
...	...	...

1, the Linux network device storage path is/etc/sysconfig/network-scripts into the directory:

[Root@localhost ~]# cd/etc/sysconfig/network-scripts/

[Root@localhost network-scripts]# LL

Total 196

-rw-r--r--. 1 root 212 Mar 22:15 Ifcfg-eth0

2. Create a ifcfg-eth0:x on the/etc/sysconfig/network-scripts directory (x can be 0,1,2 ...). For simplicity we can speak Ifcfg-eth0, copy a name to ifcfg-eth0:0, and then modify the configuration file.

[Root@localhost network-scripts]# CP Ifcfg-eth0 ifcfg-eth0:0

3. Edit ifcfg-eth0:0 Virtual IP

[Root@localhost network-scripts]# Vim ifcfg-eth0:0

Device= "eth0:0"//Modify the name of the device

bootproto= "Static"//[none|static|bootp|dhcp] (do not use protocol at boot | static Allocation | BOOTP protocol | DHCP protocol)

ipaddr=172.188.174.20//Modify IP Address

netmask=255.255.255.0//Subnet mask

gateway=192.168.1.1//Gateway

broadcast= ' 192.168.1.255 '//broadcast address

Hwaddr= "00:0c:29:c9:6d:11"//mac address

Nm_controlled= "Yes"

onboot= "yes"//power-on Activation

: Wq

If you need to bind more than one IP address, simply add the file name and the eth0:x in the device in the file.