Andy's Blog » » CentOS 添加/绑定 IP

CentOS 添加/绑定 IP

cd /etc/sysconfig/network-scripts/

The file we're interested in is ifcfg-eth0, the interface for the Ethernet device. If you have a second Ethernet device then there would be an ifcfg-eth1 file and so on for each adapter you have installed. Let's assume we want to bind three additional IP's (,, and to the NIC. We need to create three alias files while ifcfg-eth0 maintains the primary IP address. This is how we'll set up the aliases to bind the IP addresses.

Adapter	IP Address	Type
eth0	Primary
eth0:0	Alias 1
eth0:1	Alias 2
eth0:2	Alias 3

The :X (where X is the interface number) is appended to the interface file name to create the alias. For each alias you create you assign a number sequentially. For this example we will create aliases for eth0. Make a copy of ifcfg-eth0 for the three aliases.

cp ifcfg-eth0 ifcfg-eth0:0
cp ifcfg-eth0 ifcfg-eth0:1
cp ifcfg-eth0 ifcfg-eth0:2

Take a look inside ifcfg-eth0 and review the contents.

more ifcfg-eth0

We're interested in only two lines (DEVICE and IPADDR). We'll rename the device in each file to its corresponding interface alias and change the IP's. We'll start with ifcfg-eth0:0. Open ifcfg-eth0:0 in vi and change the two lines so they have the new interface and IP address.

vi ifcfg-eth0:0


Save ifcfg-eth0:0 and edit the other two alias files (ifcfg-eth0:1 and ifcfg-eth0:2) so they have the new interfaces and IP addresses set (follow the table from above). Once you save all your changes you can restart the network for the changes to take effect.

service network restart

To verify all the aliases are up and running you can run ifconfig (depending on how many new IP's you set up, you can use ifconfig | more to pause the output).


You can also test the IP's by pinging them from a different machine. If everything is working then there should be a response back.


Looks like everything is working like a charm. With the new IP's you can set up sites in Apache bound to a dedicated IP, anonymous FTP, and many other things.

Incoming search terms:

Tags: centos, 添加IP, 绑定IP